ovn-nb(5) — Linux manual page

NAME | TABLE SUMMARY | NB_Global TABLE | Copp TABLE | Logical_Switch TABLE | Logical_Switch_Port TABLE | Forwarding_Group TABLE | Address_Set TABLE | Port_Group TABLE | Load_Balancer TABLE | Load_Balancer_Group TABLE | Load_Balancer_Health_Check TABLE | ACL TABLE | Logical_Router TABLE | QoS TABLE | Mirror TABLE | Meter TABLE | Meter_Band TABLE | Logical_Router_Port TABLE | Logical_Router_Static_Route TABLE | Logical_Router_Policy TABLE | NAT TABLE | DHCP_Options TABLE | DHCP_Relay TABLE | Connection TABLE | DNS TABLE | SSL TABLE | Gateway_Chassis TABLE | HA_Chassis_Group TABLE | HA_Chassis TABLE | BFD TABLE | Static_MAC_Binding TABLE | Chassis_Template_Var TABLE | COLOPHON

ovn-nb(5)                  Open vSwitch Manual                 ovn-nb(5)

NAME         top

       ovn-nb - OVN_Northbound database schema

       This database is the interface between OVN and the cloud
       management system (CMS), such as OpenStack, running above it. The
       CMS produces almost all of the contents of the database. The
       ovn-northd program monitors the database contents, transforms it,
       and stores it into the OVN_Southbound database.

       We generally speak of ``the’’ CMS, but one can imagine scenarios
       in which multiple CMSes manage different parts of an OVN
       deployment.

   External IDs
       Each of the tables in this database contains a special column,
       named external_ids. This column has the same form and purpose
       each place it appears.

              external_ids: map of string-string pairs
                     Key-value pairs for use by the CMS. The CMS might
                     use certain pairs, for example, to identify
                     entities in its own configuration that correspond
                     to those in this database.

TABLE SUMMARY         top

       The following list summarizes the purpose of each of the tables
       in the OVN_Northbound database.  Each table is described in more
       detail on a later page.

       Table     Purpose
       NB_Global Northbound configuration
       Copp      Control plane protection
       Logical_Switch
                 L2 logical switch
       Logical_Switch_Port
                 L2 logical switch port
       Forwarding_Group
                 forwarding group
       Address_Set
                 Address Sets
       Port_Group
                 Port Groups
       Load_Balancer
                 load balancer
       Load_Balancer_Group
                 load balancer group
       Load_Balancer_Health_Check
                 load balancer
       ACL       Access Control List (ACL) rule
       Logical_Router
                 L3 logical router
       QoS       QoS rule
       Mirror    Mirror Entry
       Meter     Meter entry
       Meter_Band
                 Band for meter entries
       Logical_Router_Port
                 L3 logical router port
       Logical_Router_Static_Route
                 Logical router static routes
       Logical_Router_Policy
                 Logical router policies
       NAT       NAT rules
       DHCP_Options
                 DHCP options
       DHCP_Relay
                 DHCP Relay
       Connection
                 OVSDB client connections.
       DNS       Native DNS resolution
       SSL       SSL configuration.
       Gateway_Chassis
                 Gateway_Chassis configuration.
       HA_Chassis_Group
                 HA_Chassis_Group configuration.
       HA_Chassis
                 HA_Chassis configuration.
       BFD       BFD configuration.
       Static_MAC_Binding
                 Static_MAC_Binding configuration.
       Chassis_Template_Var
                 Chassis_Template_Var configuration.

NB_Global TABLE         top

       Northbound configuration for an OVN system. This table must have
       exactly one row.

   Summary:
       Identity:
         name                        string
       Status:
         nb_cfg                      integer
         nb_cfg_timestamp            integer
         sb_cfg                      integer
         sb_cfg_timestamp            integer
         hv_cfg                      integer
         hv_cfg_timestamp            integer
       Common Columns:
         external_ids                map of string-string pairs
       Common options:
         options                     map of string-string pairs
         Options for configuring OVS BFD:
            options : bfd-min-rx     optional string
            options : bfd-decay-min-rx
                                     optional string
            options : bfd-min-tx     optional string
            options : bfd-mult       optional string
         options : ignore_chassis_features
                                     optional string
         options : mac_prefix        optional string
         options : mac_binding_removal_limit
                                     optional string, containing an
                                     integer, in range 0 to
                                     4,294,967,295
         options : fdb_removal_limit
                                     optional string, containing an
                                     integer, in range 0 to
                                     4,294,967,295
         options : controller_event  optional string, either true or
                                     false
         options : northd_probe_interval
                                     optional string
         options : ic_probe_interval
                                     optional string
         options : nbctl_probe_interval
                                     optional string
         options : northd_trim_timeout
                                     optional string
         options : use_logical_dp_groups
                                     optional string
         options : use_parallel_build
                                     optional string
         options : ignore_lsp_down   optional string
         options : use_ct_inv_match  optional string
         options : default_acl_drop  optional string
         options : debug_drop_domain_id
                                     optional string
         options : debug_drop_collector_set
                                     optional string
         options : use_common_zone   optional string, either true or
                                     false
         options : northd-backoff-interval-ms
                                     optional string
         Options for configuring interconnection route advertisement:
            options : ic-route-adv   optional string
            options : ic-route-learn optional string
            options : ic-route-adv-default
                                     optional string
            options : ic-route-learn-default
                                     optional string
            options : ic-route-denylist
                                     optional string
       Connection Options:
         connections                 set of Connections
         ssl                         optional SSL
       Security Configurations:
         ipsec                       boolean
       Read-only Options:
         options : max_tunid         optional string

   Details:
     Identity:

       name: string
              The name of the OVN cluster, which uniquely identifies the
              OVN cluster throughout all OVN clusters supposed to
              interconnect with each other.

     Status:

       These columns allow a client to track the overall configuration
       state of the system.

       nb_cfg: integer
              Sequence number for client to increment. When a client
              modifies any part of the northbound database configuration
              and wishes to wait for ovn-northd and possibly all of the
              hypervisors to finish applying the changes, it may
              increment this sequence number.

       nb_cfg_timestamp: integer
              The timestamp, in milliseconds since the epoch, when
              ovn-northd sees the latest nb_cfg and starts processing.

              To print the timestamp as a human-readable date:

                        date -d "@$(ovn-nbctl get NB_Global . nb_cfg_timestamp | sed ’s/...$//’)"

       sb_cfg: integer
              Sequence number that ovn-northd sets to the value of
              nb_cfg after it finishes applying the corresponding
              configuration changes to the OVN_Southbound database.

       sb_cfg_timestamp: integer
              The timestamp, in milliseconds since the epoch, when
              ovn-northd finishes applying the corresponding
              configuration changes to the OVN_Southbound database
              successfully.

       hv_cfg: integer
              Sequence number that ovn-northd sets to the smallest
              sequence number of all the chassis in the system, as
              reported in the Chassis_Private table in the southbound
              database. Thus, hv_cfg equals nb_cfg if all chassis are
              caught up with the northbound configuration (which may
              never happen, if any chassis is down). This value can
              regress, if a chassis was removed from the system and
              rejoins before catching up.

              If there are no chassis, then ovn-northd copies nb_cfg to
              hv_cfg. Thus, in this case, the (nonexistent) hypervisors
              are always considered to be caught up. This means that
              hypervisors can be "caught up" even in cases where sb_cfg
              would show that the southbound database is not. To detect
              when both the hypervisors and the southbound database are
              caught up, a client should take the smaller of sb_cfg and
              hv_cfg.

       hv_cfg_timestamp: integer
              The largest timestamp, in milliseconds since the epoch, of
              the smallest sequence number of all the chassis in the
              system, as reported in the Chassis_Private table in the
              southbound database. In other words, this timestamp
              reflects the time when the slowest chassis catches up with
              the northbound configuration, which is useful for end-to-
              end control plane latency measurement.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

     Common options:

       options: map of string-string pairs
              This column provides general key/value settings. The
              supported options are described individually below.

     Options for configuring OVS BFD:

       These options apply when ovn-controller configures OVS BFD on
       tunnels interfaces. Please note these parameters refer to legacy
       OVS BFD implementation and not to OVN BFD one.

       options : bfd-min-rx: optional string
              BFD option min-rx value to use when configuring BFD on
              tunnel interfaces.

       options : bfd-decay-min-rx: optional string
              BFD option decay-min-rx value to use when configuring BFD
              on tunnel interfaces.

       options : bfd-min-tx: optional string
              BFD option min-tx value to use when configuring BFD on
              tunnel interfaces.

       options : bfd-mult: optional string
              BFD option mult value to use when configuring BFD on
              tunnel interfaces.

       options : ignore_chassis_features: optional string
              When set to false, the ovn-northd will evaluate the
              features supported by each chassis and will only activate
              features that are universally supported by all chassis.
              This approach is crucial for maintaining backward
              compatibility during an upgrade when the ovn-northd is
              updated prior to the ovn-controller. However, if any
              chassis is poorly managed and the upgrade is unsuccessful,
              it will restrict ovn-northd from activating the new
              features.

              Alternatively, setting this option to true instructs
              ovn-northd to bypass the support status of features on
              each chassis and to directly implement the latest
              features. This approach safeguards the operation of
              ovn-northd from being adversely affected by a mismatched
              configuration of a chassis.

              The default setting for this option is false.

       options : mac_prefix: optional string
              Configure a given OUI to be used as prefix when L2 address
              is dynamically assigned, e.g. 00:11:22

       options : mac_binding_removal_limit: optional string, containing
       an integer, in range 0 to 4,294,967,295
              MAC binding aging bulk removal limit. This limits how many
              rows can expire in a single transaction. Default value is
              0 which is unlimited. When we hit the limit next batch
              removal is delayed by 5 s.

       options : fdb_removal_limit: optional string, containing an
       integer, in range 0 to 4,294,967,295
              FDB aging bulk removal limit. This limits how many rows
              can expire in a single transaction. Default value is 0
              which is unlimited. When we hit the limit next batch
              removal is delayed by 5 s.

       options : controller_event: optional string, either true or false
              Value set by the CMS to enable/disable ovn-controller
              event reporting. Traffic into OVS can raise a ’controller’
              event that results in a Controller_Event being written to
              the Controller_Event table in SBDB. When the CMS has seen
              the event and taken appropriate action, it can remove the
              corresponding row in Controller_Event table. The intention
              is for a CMS to see the events and take some sort of
              action. Please see the Controller_Event table in SBDB. It
              is possible to associate a meter to each controller event
              type in order to not overload the pinctrl thread under
              heavy load. Each event type relies on a meter with a
              defined name:

              •      empty_lb_backends: event-elb

       options : northd_probe_interval: optional string
              The inactivity probe interval of the connection to the OVN
              Northbound and Southbound databases from ovn-northd, in
              milliseconds. If the value is zero, it disables the
              connection keepalive feature.

              If the value is nonzero, then it will be forced to a value
              of at least 1000 ms.

       options : ic_probe_interval: optional string
              The inactivity probe interval of the connection to the OVN
              Northbound and Southbound databases from ovn-ic, in
              milliseconds. If the value is zero, it disables the
              connection keepalive feature.

              If the value is nonzero, then it will be forced to a value
              of at least 1000 ms.

       options : nbctl_probe_interval: optional string
              The inactivity probe interval of the connection to the OVN
              Northbound database from ovn-nbctl utility, in
              milliseconds. If the value is zero, it disables the
              connection keepalive feature.

              If the value is nonzero, then it will be forced to a value
              of at least 1000 ms.

              If the value is less than zero, then the default
              inactivity probe interval for ovn-nbctl would be left
              intact (120000 ms).

       options : northd_trim_timeout: optional string
              When used, this configuration value specifies the time, in
              milliseconds, since the last ovn-northd active operation
              after which memory trimming is performed. By default this
              is set to 30000 (30 seconds).

       options : use_logical_dp_groups: optional string
              Note: This option is deprecated, the only behavior is to
              always combine logical flows by datapath groups. Changing
              the value or removing this option all toghether will have
              no effect.

              ovn-northd combines logical flows that differs only by
              logical datapath into a single logical flow with logical
              datapath group attached.

       options : use_parallel_build: optional string
              If set to true, ovn-northd will attempt to compute logical
              flows in parallel.

              Parallel computation is enabled only if the system has 4
              or more cores/threads available to be used by ovn-northd.

              The default value is false.

       options : ignore_lsp_down: optional string
              If set to false, ARP/ND reply flows for logical switch
              ports will be installed only if the port is up, i.e.
              claimed by a Chassis. If set to true, these flows are
              installed regardless of the status of the port, which can
              result in a situation that ARP request to an IP is
              resolved even before the relevant VM/container is running.
              For environments where this is not an issue, setting it to
              true can reduce the load and latency of the control plane.
              The default value is true.

       options : use_ct_inv_match: optional string
              If set to false, ovn-northd will not use the ct.inv field
              in any of the logical flow matches. The default value is
              true. If the NIC supports offloading OVS datapath flows
              but doesn’t support offloading ct_state inv flag, then the
              datapath flows matching on this flag (either +inv or -inv)
              will not be offloaded. CMS should consider setting
              use_ct_inv_match to false in such cases. This results in a
              side effect of the invalid packets getting delivered to
              the destination VIF, which otherwise would have been
              dropped by OVN.

       options : default_acl_drop: optional string
              If set to true., ovn-northd will generate a logical flow
              to drop all traffic in the ACL stages. By default this
              option is set to false.

       options : debug_drop_domain_id: optional string
              If set to a 8-bit number and if debug_drop_collector_set
              is also configured, ovn-northd will add a sample action to
              every logical flow that contains a ’drop’ action. The 8
              most significant bits of the observation_domain_id field
              will be those specified in the  debug_drop_domain_id. The
              24 least significant bits of the observation_domain_id
              field will be the datapath’s key.

              The observation_point_id will be set to the first 32 bits
              of the logical flow’s UUID.

       options : debug_drop_collector_set: optional string
              If set to a 32-bit number ovn-northd will add a sample
              action to every logical flow that contains a ’drop’
              action. The sample action will have the specified
              collector_set_id. The value must match that of the local
              OVS configuration as described in ovs-actions(7).

       options : use_common_zone: optional string, either true or false
              Default value is false. If set to true the SNAT and DNAT
              happens in common zone, instead of happening in separate
              zones, depending on the configuration. However, this
              option breaks traffic when there is configuration of DGP +
              LB + SNAT on this LR. The value true should be used only
              in case of HWOL compatibility with GDP.

       options : northd-backoff-interval-ms: optional string
              Maximum interval that the northd incremental engine is
              delayed by in milliseconds. Setting the value to nonzero
              delays the next northd engine run by the previous run
              time, capped by the specified value. If the value is zero
              the engine won’t be delayed at all. The recommended period
              is smaller than 500 ms, beyond that the latency of SB
              changes would be very noticeable.

     Options for configuring interconnection route advertisement:

       These options control how routes are advertised between OVN
       deployments for interconnection. If enabled, ovn-ic from
       different OVN deployments exchanges routes between each other
       through the global OVN_IC_Southbound database. Only routers with
       ports connected to interconnection transit switches participate
       in route advertisement. For each of these routers, there are two
       types of routes to be advertised:

       Firstly, the static routes configured in the router are
       advertised.

       Secondly, the networks configured in the logical router ports
       that are not on the transit switches are advertised. These are
       considered as directly connected subnets on the router.

       Link local prefixes (IPv4 169.254.0.0/16 and IPv6 FE80::/10) are
       never advertised.

       The learned routes are added to the static_routes column of the
       Logical_Router table, with external_ids:ic-learned-route set to
       the uuid of the row in Route table of the OVN_IC_Southbound
       database.

       options : ic-route-adv: optional string
              A boolean value that enables route advertisement to the
              global OVN_IC_Southbound database. Default is false.

       options : ic-route-learn: optional string
              A boolean value that enables route learning from the
              global OVN_IC_Southbound database. Default is false.

       options : ic-route-adv-default: optional string
              A boolean value that enables advertising default route to
              the global OVN_IC_Southbound database. Default is false.
              This option takes effect only when option ic-route-adv is
              true.

       options : ic-route-learn-default: optional string
              A boolean value that enables learning default route from
              the global OVN_IC_Southbound database. Default is false.
              This option takes effect only when option ic-route-learn
              is true.

       options : ic-route-denylist: optional string
              A string value contains a list of CIDRs delimited by ",".
              A route will not be advertised or learned if the route’s
              prefix belongs to any of the CIDRs listed.

     Connection Options:

       connections: set of Connections
              Database clients to which the Open vSwitch database server
              should connect or on which it should listen, along with
              options for how these connections should be configured.
              See the Connection table for more information.

       ssl: optional SSL
              Global SSL configuration.

     Security Configurations:

       ipsec: boolean
              Tunnel encryption configuration. If this column is set to
              be true, all OVN tunnels will be encrypted with IPsec.

     Read-only Options:

       options : max_tunid: optional string
              The maximum supported tunnel ID. Depends on types of
              encapsulation enabled in the cluster.

Copp TABLE         top

       This table is used to define control plane protection policies,
       i.e., associate entries from table Meter to control protocol
       names.

   Summary:
       name                          string (must be unique within
                                     table)
       meters : arp                  optional string
       meters : arp-resolve          optional string
       meters : dhcpv4-opts          optional string
       meters : dhcpv6-opts          optional string
       meters : dns                  optional string
       meters : event-elb            optional string
       meters : icmp4-error          optional string
       meters : icmp6-error          optional string
       meters : igmp                 optional string
       meters : nd-na                optional string
       meters : nd-ns                optional string
       meters : nd-ns-resolve        optional string
       meters : nd-ra-opts           optional string
       meters : tcp-reset            optional string
       meters : bfd                  optional string
       meters : reject               optional string
       meters : svc-monitor          optional string
       external_ids                  map of string-string pairs

   Details:
       name: string (must be unique within table)
              CoPP name.

       meters : arp: optional string
              Rate limiting meter for ARP packets (request/reply) used
              for learning neighbors.

       meters : arp-resolve: optional string
              Rate limiting meter for packets that require resolving the
              next-hop (through ARP).

       meters : dhcpv4-opts: optional string
              Rate limiting meter for packets that require adding DHCPv4
              options.

       meters : dhcpv6-opts: optional string
              Rate limiting meter for packets that require adding DHCPv6
              options.

       meters : dns: optional string
              Rate limiting meter for DNS query packets that need to be
              replied to.

       meters : event-elb: optional string
              Rate limiting meter for empty load balancer events.

       meters : icmp4-error: optional string
              Rate limiting meter for packets that require replying with
              an ICMP error.

       meters : icmp6-error: optional string
              Rate limiting meter for packets that require replying with
              an ICMPv6 error.

       meters : igmp: optional string
              Rate limiting meter for IGMP packets.

       meters : nd-na: optional string
              Rate limiting meter for ND neighbor advertisement packets
              used for learning neighbors.

       meters : nd-ns: optional string
              Rate limiting meter for ND neighbor solicitation packets
              used for learning neighbors.

       meters : nd-ns-resolve: optional string
              Rate limiting meter for packets that require resolving the
              next-hop (through ND).

       meters : nd-ra-opts: optional string
              Rate limiting meter for packets that require adding ND
              router advertisement options.

       meters : tcp-reset: optional string
              Rate limiting meter for packets that require replying with
              TCP RST packet.

       meters : bfd: optional string
              Rate limiting meter for BFD packets.

       meters : reject: optional string
              Rate limiting meter for packets that trigger a reject
              action

       meters : svc-monitor: optional string
              Rate limiting meter for packets that are arriving to
              service monitor MAC address.

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

Logical_Switch TABLE         top

       Each row represents one L2 logical switch.

       There are two kinds of logical switches, that is, ones that fully
       virtualize the network (overlay logical switches) and ones that
       provide simple connectivity to physical networks (bridged logical
       switches). They work in the same way when providing connectivity
       between logical ports on same chassis, but differently when
       connecting remote logical ports. Overlay logical switches connect
       remote logical ports by tunnels, while bridged logical switches
       provide connectivity to remote ports by bridging the packets to
       directly connected physical L2 segments with the help of localnet
       ports. Each bridged logical switch has one or more localnet
       ports, which have only one special address unknown.

   Summary:
       ports                         set of Logical_Switch_Ports
       load_balancer                 set of weak reference to
                                     Load_Balancers
       load_balancer_group           set of Load_Balancer_Groups
       acls                          set of ACLs
       qos_rules                     set of QoSes
       dns_records                   set of weak reference to DNSes
       forwarding_groups             set of Forwarding_Groups
       Naming:
         name                        string
         external_ids : neutron:network_name
                                     optional string
       IP Address Assignment:
         other_config : subnet       optional string
         other_config : exclude_ips  optional string
         other_config : ipv6_prefix  optional string
         other_config : dhcp_relay_port
                                     optional string
         other_config : mac_only     optional string, either true or
                                     false
         other_config : fdb_age_threshold
                                     optional string, containing an
                                     integer, in range 0 to
                                     4,294,967,295
       IP Multicast Snooping Options:
         other_config : mcast_snoop  optional string, either true or
                                     false
         other_config : mcast_querier
                                     optional string, either true or
                                     false
         other_config : mcast_flood_unregistered
                                     optional string, either true or
                                     false
         other_config : mcast_table_size
                                     optional string, containing an
                                     integer, in range 1 to 32,766
         other_config : mcast_idle_timeout
                                     optional string, containing an
                                     integer, in range 15 to 3,600
         other_config : mcast_query_interval
                                     optional string, containing an
                                     integer, in range 1 to 3,600
         other_config : mcast_query_max_response
                                     optional string, containing an
                                     integer, in range 1 to 10
         other_config : mcast_eth_src
                                     optional string
         other_config : mcast_ip4_src
                                     optional string
         other_config : mcast_ip6_src
                                     optional string
       Interconnection:
         other_config : interconn-ts
                                     optional string
       Tunnel Key:
         other_config : requested-tnl-key
                                     optional string, containing an
                                     integer, in range 1 to 16,777,215
       copp                          optional weak reference to Copp
       Other options:
         other_config : vlan-passthru
                                     optional string, either true or
                                     false
         other_config : broadcast-arps-to-all-routers
                                     optional string, either true or
                                     false
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       ports: set of Logical_Switch_Ports
              The logical ports connected to the logical switch.

              It is an error for multiple logical switches to include
              the same logical port.

       load_balancer: set of weak reference to Load_Balancers
              Set of load balancers associated to this logical switch.

       load_balancer_group: set of Load_Balancer_Groups
              Set of load balancers groups associated to this logical
              switch.

       acls: set of ACLs
              Access control rules that apply to packets within the
              logical switch.

       qos_rules: set of QoSes
              QoS marking and metering rules that apply to packets
              within the logical switch.

       dns_records: set of weak reference to DNSes
              This column defines the DNS records to be used for
              resolving internal DNS queries within the logical switch
              by the native DNS resolver. Please see the DNS table.

       forwarding_groups: set of Forwarding_Groups
              Groups a set of logical port endpoints for traffic going
              out of the logical switch.

     Naming:

       These columns provide names for the logical switch. From OVN’s
       perspective, these names have no special meaning or purpose other
       than to provide convenience for human interaction with the
       database. There is no requirement for the name to be unique. (For
       a unique identifier for a logical switch, use its row UUID.)

       (Originally, name was intended to serve the purpose of a human-
       friendly name, but the Neutron integration used it to uniquely
       identify its own switch object, in the format neutron-uuid. Later
       on, Neutron started propagating the friendly name of a switch as
       external_ids:neutron:network_name. Perhaps this can be cleaned up
       someday.)

       name: string
              A name for the logical switch.

       external_ids : neutron:network_name: optional string
              Another name for the logical switch.

     IP Address Assignment:

       These options control automatic IP address management (IPAM) for
       ports attached to the logical switch. To enable IPAM for IPv4,
       set other_config:subnet and optionally other_config:exclude_ips.
       To enable IPAM for IPv6, set other_config:ipv6_prefix. IPv4 and
       IPv6 may be enabled together or separately.

       To request dynamic address assignment for a particular port, use
       the dynamic keyword in the addresses column of the port’s
       Logical_Switch_Port row. This requests both an IPv4 and an IPv6
       address, if IPAM for IPv4 and IPv6 are both enabled.

       other_config : subnet: optional string
              Set this to an IPv4 subnet, e.g. 192.168.0.0/24, to enable
              ovn-northd to automatically assign IP addresses within
              that subnet.

       other_config : exclude_ips: optional string
              To exclude some addresses from automatic IP address
              management, set this to a list of the IPv4 addresses or
              ..-delimited ranges to exclude. The addresses or ranges
              should be a subset of those in other_config:subnet.

              Whether listed or not, ovn-northd will never allocate the
              first or last address in a subnet, such as 192.168.0.0 or
              192.168.0.255 in 192.168.0.0/24.

              Examples:

              •      192.168.0.2 192.168.0.10192.168.0.4 192.168.0.30..192.168.0.60
                     192.168.0.110..192.168.0.120192.168.0.110..192.168.0.120
                     192.168.0.25..192.168.0.30 192.168.0.144

       other_config : ipv6_prefix: optional string
              Set this to an IPv6 prefix to enable ovn-northd to
              automatically assign IPv6 addresses using this prefix. The
              assigned IPv6 address will be generated using the IPv6
              prefix and the MAC address (converted to an IEEE EUI64
              identifier) of the port. The IPv6 prefix defined here
              should be a valid IPv6 address ending with ::.

              Examples:

              •      aef0::bef0:1234:a890:5678::8230:5678::

       other_config : dhcp_relay_port: optional string
              If set to the name of logical switch port of type router
              then, DHCP Relay is enabled for this logical switch
              provided the corresponding Logical_Router_Port has DHCP
              Relay configured.

       other_config : mac_only: optional string, either true or false
              Value used to request to assign L2 address only if neither
              subnet nor ipv6_prefix are specified

       other_config : fdb_age_threshold: optional string, containing an
       integer, in range 0 to 4,294,967,295
              FDB aging threshold value in seconds. FDB exceeding this
              timeout will be automatically removed. The value defaults
              to 0, which means disabled.

     IP Multicast Snooping Options:

       These options control IP Multicast Snooping configuration of the
       logical switch. To enable IP Multicast Snooping set
       other_config:mcast_snoop to true. To enable IP Multicast Querier
       set other_config:mcast_querier to true. If IP Multicast Querier
       is enabled other_config:mcast_eth_src and
       other_config:mcast_ip4_src must be set.

       other_config : mcast_snoop: optional string, either true or false
              Enables/disables IP Multicast Snooping on the logical
              switch. Default: false.

       other_config : mcast_querier: optional string, either true or
       false
              Enables/disables IP Multicast Querier on the logical
              switch. Only applicable if other_config:mcast_snoop is
              enabled. Default: true.

       other_config : mcast_flood_unregistered: optional string, either
       true or false
              Determines whether unregistered multicast traffic should
              be flooded or not. Only applicable if
              other_config:mcast_snoop is enabled. Default: false.

       other_config : mcast_table_size: optional string, containing an
       integer, in range 1 to 32,766
              Number of multicast groups to be stored. Default: 2048.

       other_config : mcast_idle_timeout: optional string, containing an
       integer, in range 15 to 3,600
              Configures the IP Multicast Snooping group idle timeout
              (in seconds). Default: 300 seconds.

       other_config : mcast_query_interval: optional string, containing
       an integer, in range 1 to 3,600
              Configures the IP Multicast Querier interval between
              queries (in seconds). Default:
              other_config:mcast_idle_timeout / 2.

       other_config : mcast_query_max_response: optional string,
       containing an integer, in range 1 to 10
              Configures the value of the "max-response" field in the
              multicast queries originated by the logical switch.
              Default: 1 second.

       other_config : mcast_eth_src: optional string
              Configures the source Ethernet address for queries
              originated by the logical switch.

       other_config : mcast_ip4_src: optional string
              Configures the source IPv4 address for queries originated
              by the logical switch.

       other_config : mcast_ip6_src: optional string
              Configures the source IPv6 address for queries originated
              by the logical switch.

     Interconnection:

       other_config : interconn-ts: optional string
              The name of corresponding transit switch in
              OVN_IC_Northbound database. This kind of logical switch is
              created and controlled by ovn-ic.

     Tunnel Key:

       other_config : requested-tnl-key: optional string, containing an
       integer, in range 1 to 16,777,215
              Configures the datapath tunnel key for the logical switch.
              Usually this is not needed because ovn-northd will assign
              an unique key for each datapath by itself. However, if it
              is configured, ovn-northd honors the configured value. The
              typical use case is for interconnection: the tunnel keys
              for transit switches need to be unique globally, so they
              are maintained in the global OVN_IC_Southbound database,
              and ovn-ic simply syncs the value from OVN_IC_Southbound
              through this config.

       copp: optional weak reference to Copp
              The control plane protection policy from table Copp used
              for metering packets sent to ovn-controller from ports of
              this logical switch.

     Other options:

       other_config : vlan-passthru: optional string, either true or
       false
              Determines whether VLAN tagged incoming traffic should be
              allowed. Note that this may have security implications
              when enabled for a logical switch with a tag=0 localnet
              port. If not properly isolated from other localnet ports,
              fabric traffic that belongs to other tagged networks may
              be passed through such a port.

       other_config : broadcast-arps-to-all-routers: optional string,
       either true or false
              Determines whether arp requests and ipv6 neighbor
              solicitations should be sent to all routers and other
              switchports (default) or if it should only be sent to
              switchports where the ip/mac address is unknown. Setting
              this to false can significantly reduce the load if the
              logical switch can receive arp requests for ips it does
              not know about. However setting this to false also means
              that garps are no longer forwarded to all routers and
              therefor the mac bindings of the routers are no longer
              updated.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

Logical_Switch_Port TABLE         top

       A port within an L2 logical switch.

   Summary:
       Core Features:
         name                        string (must be unique within
                                     table)
         type                        string
       Options:
         options                     map of string-string pairs
         Options for router ports:
            options : router-port    optional string
            options : nat-addresses  optional string
            options : exclude-lb-vips-from-garp
                                     optional string
            options : arp_proxy      optional string
            options : enable_router_port_acl
                                     optional string, either true or
                                     false
         Options for localnet ports:
            options : network_name   optional string
            options : ethtype        optional string
            options : localnet_learn_fdb
                                     optional string, either true or
                                     false
         Options for l2gateway ports:
            options : network_name   optional string
            options : l2gateway-chassis
                                     optional string
         Options for vtep ports:
            options : vtep-physical-switch
                                     optional string
            options : vtep-logical-switch
                                     optional string
         VMI (or VIF) Options:
            options : requested-chassis
                                     optional string
            options : activation-strategy
                                     optional string
            options : iface-id-ver   optional string
            options : qos_min_rate   optional string
            options : qos_max_rate   optional string
            options : qos_burst      optional string
            options : hostname       optional string
            options : force_fdb_lookup
                                     optional string, either true or
                                     false
            options : pkt_clone_type optional string, must be mc_unknown
            options : disable_arp_nd_rsp
                                     optional string, either true or
                                     false
            VIF Plugging Options:
              options : vif-plug-type
                                     optional string
              options : vif-plug-mtu-request
                                     optional string
         Virtual port Options:
            options : virtual-ip     optional string
            options : virtual-parents
                                     optional string
         IP Multicast Snooping Options:
            options : mcast_flood    optional string, either true or
                                     false
            options : mcast_flood_reports
                                     optional string, either true or
                                     false
       Containers:
         parent_name                 optional string
         tag_request                 optional integer, in range 0 to
                                     4,095
         tag                         optional integer, in range 1 to
                                     4,095
       Port State:
         up                          optional boolean
         enabled                     optional boolean
       Addressing:
         addresses                   set of strings
         dynamic_addresses           optional string
         port_security               set of strings
       DHCP:
         dhcpv4_options              optional weak reference to
                                     DHCP_Options
         dhcpv6_options              optional weak reference to
                                     DHCP_Options
       mirror_rules                  set of weak reference to Mirrors
       ha_chassis_group              optional HA_Chassis_Group
       Naming:
         external_ids : neutron:port_name
                                     optional string
       Tunnel Key:
         options : requested-tnl-key
                                     optional string, containing an
                                     integer, in range 1 to 32,767
       Common Columns:
         external_ids                map of string-string pairs

   Details:
     Core Features:

       name: string (must be unique within table)
              The logical port name.

              For entities (VMs or containers) that are spawned in the
              hypervisor, the name used here must match those used in
              the external_ids:iface-id in the Open_vSwitch database’s
              Interface table, because hypervisors use
              external_ids:iface-id as a lookup key to identify the
              network interface of that entity.

              For containers that share a VIF within a VM, the name can
              be any unique identifier. See Containers, below, for more
              information.

              A logical switch port may not have the same name as a
              logical router port, but the database schema cannot
              enforce this.

       type: string
              Specify a type for this logical port. Logical ports can be
              used to model other types of connectivity into an OVN
              logical switch. The following types are defined:

              (empty string)
                     A VM (or VIF) interface.

              router A connection to a logical router. The value of
                     options:router-port specifies the name of the
                     Logical_Router_Port to which this logical switch
                     port is connected.

              localnet
                     A connection to a locally accessible network from
                     ovn-controller instances that have a corresponding
                     bridge mapping. A logical switch can have multiple
                     localnet ports attached. This type is used to model
                     direct connectivity to existing networks. In this
                     case, each chassis should have a mapping for one of
                     the physical networks only. Note: nothing said
                     above implies that a chassis cannot be plugged to
                     multiple physical networks as long as they belong
                     to different switches.

              localport
                     A connection to a local VIF. Traffic that arrives
                     on a localport is never forwarded over a tunnel to
                     another chassis. These ports are present on every
                     chassis and have the same address in all of them.
                     This is used to model connectivity to local
                     services that run on every hypervisor.

              l2gateway
                     A connection to a physical network.

              vtep   A port to a logical switch on a VTEP gateway.

              external
                     Represents a logical port which is external and not
                     having an OVS port in the integration bridge. OVN
                     will never receive any traffic from this port or
                     send any traffic to this port. OVN can support
                     native services like DHCPv4/DHCPv6/DNS for this
                     port. If ha_chassis_group is defined,
                     ovn-controller running in the active chassis of the
                     HA chassis group will bind this port to provide
                     these native services. It is expected that this
                     port belong to a bridged logical switch (with a
                     localnet port).

                     It is recommended to use the same HA chassis group
                     for all the external ports of a logical switch.
                     Otherwise, the physical switch might see MAC flap
                     issue when different chassis provide the native
                     services. For example when supporting native DHCPv4
                     service, DHCPv4 server mac (configured in
                     options:server_mac column in table DHCP_Options)
                     originating from different ports can cause MAC flap
                     issue. The MAC of the logical router IP(s) can also
                     flap if the same HA chassis group is not set for
                     all the external ports of a logical switch.

                     Below are some of the use cases where external
                     ports can be used.

                     •      VMs connected to SR-IOV nics - Traffic from
                            these VMs by passes the kernel stack and
                            local ovn-controller do not bind these ports
                            and cannot serve the native services.

                     •      When CMS supports provisioning baremetal
                            servers.

              virtual
                     Represents a logical port which does not have an
                     OVS port in the integration bridge and has a
                     virtual ip configured in the options:virtual-ip
                     column. This virtual ip can move around between the
                     logical ports configured in the options:virtual-
                     parents column.

                     One of the use case where virtual ports can be used
                     is.

                     •      The virtual ip represents a load balancer
                            vip and the virtual parents provide load
                            balancer service in an active-standby setup
                            with the active virtual parent owning the
                            virtual ip.

              remote A remote port is to model a port that resides
                     remotely on another OVN, which is on the other side
                     of a transit logical switch for OVN
                     interconnection. This type of ports are created by
                     ovn-ic instead of by CMS. Any change to the port
                     will be automatically overwritten by ovn-ic.

     Options:

       options: map of string-string pairs
              This column provides key/value settings specific to the
              logical port type. The type-specific options are described
              individually below.

     Options for router ports:

       These options apply when type is router.

       options : router-port: optional string
              Required. The name of the Logical_Router_Port to which
              this logical switch port is connected.

       options : nat-addresses: optional string
              This is used to send gratuitous ARPs for SNAT and DNAT IP
              addresses via the localnet port that is attached to the
              same logical switch as this type router port. This option
              is specified on a logical switch port that is connected to
              a gateway router, or a logical switch port that is
              connected to a distributed gateway port on a logical
              router.

              This must take one of the following forms:

              router Gratuitous ARPs will be sent for all SNAT and DNAT
                     external IP addresses and for all load balancer IP
                     addresses defined on the options:router-port’s
                     logical router, using the options:router-port’s MAC
                     address.

                     This form of options:nat-addresses is valid for
                     logical switch ports where options:router-port is
                     the name of a port on a gateway router, or the name
                     of a distributed gateway port.

                     Supported only in OVN 2.8 and later. Earlier
                     versions required NAT addresses to be manually
                     synchronized.

              Ethernet address followed by one or more IPv4 addresses
                     Example: 80:fa:5b:06:72:b7 158.36.44.22
                     158.36.44.24. This would result in generation of
                     gratuitous ARPs for IP addresses 158.36.44.22 and
                     158.36.44.24 with a MAC address of
                     80:fa:5b:06:72:b7.

                     This form of options:nat-addresses is only valid
                     for logical switch ports where options:router-port
                     is the name of a port on a gateway router.

       options : exclude-lb-vips-from-garp: optional string
              If options:nat-addresses is set to router, Gratuitous ARPs
              will be sent for all SNAT and DNAT external IP addresses
              defined on the options:router-port’s logical router, using
              the options:router-port’s MAC address, not cosidering
              configured load balancers.

       options : arp_proxy: optional string
              Optional. A list of MAC and addresses/cidrs or just
              addresses/cidrs that this logical switch router port will
              reply to ARP/NDP requests. Examples: 169.254.239.254
              169.254.239.2, 0a:58:a9:fe:01:01 169.254.239.254
              169.254.239.2 169.254.238.0/24, fd7b:6b4d:7b25:d22f::1
              fd7b:6b4d:7b25:d22f::2, 0a:58:a9:fe:01:01
              fd7b:6b4d:7b25:d22f::0/64. Theoptions:router-port’s
              logical router should have a route to forward packets sent
              to configured proxy ARP MAC/IPs to an appropriate
              destination.

       options : enable_router_port_acl: optional string, either true or
       false
              Optional. Enable conntrack for the router port whose peer
              is l3dgw_port if set to true. The default value is false.

     Options for localnet ports:

       These options apply when type is localnet.

       options : network_name: optional string
              Required. The name of the network to which the localnet
              port is connected. Each hypervisor, via ovn-controller,
              uses its local configuration to determine exactly how to
              connect to this locally accessible network, if at all.

       options : ethtype: optional string
              Optional. VLAN EtherType field value for encapsulating
              VLAN headers. Supported values: 802.1q (default), 802.1ad.

       options : localnet_learn_fdb: optional string, either true or
       false
              Optional. Allows localnet port to learn MACs and store
              them in FDB table if set to true. The default value is
              false.

     Options for l2gateway ports:

       These options apply when type is l2gateway.

       options : network_name: optional string
              Required. The name of the network to which the l2gateway
              port is connected. The L2 gateway, via ovn-controller,
              uses its local configuration to determine exactly how to
              connect to this network.

       options : l2gateway-chassis: optional string
              Required. The chassis on which the l2gateway logical port
              should be bound to. ovn-controller running on the defined
              chassis will connect this logical port to the physical
              network.

     Options for vtep ports:

       These options apply when type is vtep.

       options : vtep-physical-switch: optional string
              Required. The name of the VTEP gateway.

       options : vtep-logical-switch: optional string
              Required. A logical switch name connected by the VTEP
              gateway.

     VMI (or VIF) Options:

       These options apply to logical ports with type having (empty
       string)

       options : requested-chassis: optional string
              If set, identifies a specific chassis (by name or
              hostname) that is allowed to bind this port. Using this
              option will prevent thrashing between two chassis trying
              to bind the same port during a live migration. It can also
              prevent similar thrashing due to a mis-configuration, if a
              port is accidentally created on more than one chassis.

              If set to a comma separated list, the first entry
              identifies the main chassis and the rest are one or more
              additional chassis that are allowed to bind the same port.

              When multiple chassis are set for the port, and the
              logical switch is connected to an external network through
              a localnet port, tunneling is enforced for the port to
              guarantee delivery of packets directed to the port to all
              its locations. This has MTU implications because the
              network used for tunneling must have MTU larger than
              localnet for stable connectivity.

              If the same host co-hosts more than one controller
              instance (either belonging to the same or separate
              clusters), special attention should be given to
              consistently using unique chassis names used in this
              option. It is advised that chassis names - and not host
              names - are used for this option.

       options : activation-strategy: optional string
              If used with multiple chassis set in requested-chassis,
              specifies an activation strategy for all additional
              chassis. By default, no activation strategy is used,
              meaning additional port locations are immediately
              available for use. When set to "rarp", the port is blocked
              for ingress and egress communication until a RARP packet
              is sent from a new location. The "rarp" strategy is useful
              in live migration scenarios for virtual machines.

       options : iface-id-ver: optional string
              If set, this port will be bound by ovn-controller only if
              this same key and value is configured in the external_ids
              column in the Open_vSwitch database’s Interface table.

       options : qos_min_rate: optional string
              If set, indicates the minimum guaranteed rate available
              for data sent from this interface, in bit/s.

       options : qos_max_rate: optional string
              If set, indicates the maximum rate for data sent from this
              interface, in bit/s. The traffic will be shaped according
              to this limit.

       options : qos_burst: optional string
              If set, indicates the maximum burst size for data sent
              from this interface, in bits.

       options : hostname: optional string
              If set, indicates the DHCPv4 option "Hostname" (option
              code 12) associated for this Logical Switch Port. If
              DHCPv4 is enabled for this Logical Switch Port, hostname
              dhcp option will be included in DHCP reply.

       options : force_fdb_lookup: optional string, either true or false
              This option is supported only if the Logical Switch Port
              is of default type (i.e. type set to empty_string) and
              also addresses column contains unknown. If set to true,
              MAC addresses (if configured) are not installed in the l2
              lookup table but the MAC addresses are learnt and stored
              in the FDB table. The default value is false.

       options : pkt_clone_type: optional string, must be mc_unknown
              If set to mc_unknown, packets going to this VIF get cloned
              to all unknown ports connected to the same Logical Switch.

       options : disable_arp_nd_rsp: optional string, either true or
       false
              If set to true, ARP/ND responder flows are not installed
              for the IP addresses configured on this logical port.
              Default: false.

     VIF Plugging Options:

       options : vif-plug-type: optional string
              If set, OVN will attempt to perform plugging of this VIF.
              In order to get this port plugged by the OVN controller,
              OVN must be built with support for VIF plugging. The
              default behavior is for the CMS to do the VIF plugging.
              Each VIF plug provider have their own options namespaced
              by name, for example "vif-plug:representor:key". Please
              refer to the VIF plug provider documentation located in
              Documentation/topics/vif-plug-providers/ for more
              information.

       options : vif-plug-mtu-request: optional string
              Requested MTU for plugged interfaces. When set the OVN
              controller will fill the mtu_request column of the Open
              vSwitch database’s Interface table. This in turn will make
              OVS vswitchd update the MTU of the linked interface.

     Virtual port Options:

       These options apply when type is virtual.

       options : virtual-ip: optional string
              This option represents the virtual IPv4 address.

       options : virtual-parents: optional string
              This options represents a set of logical port names (with
              in the same logical switch) which can own the virtual ip
              configured in the options:virtual-ip. All these virtual
              parents should add the virtual ip in the port_security if
              port security addressed are enabled.

     IP Multicast Snooping Options:

       These options apply when the port is part of a logical switch
       which has other_config :mcast_snoop set to true.

       options : mcast_flood: optional string, either true or false
              If set to true, multicast packets (except reports) are
              unconditionally forwarded to the specific port. Default:
              false.

       options : mcast_flood_reports: optional string, either true or
       false
              If set to true, multicast reports are unconditionally
              forwarded to the specific port. Default: false.

     Containers:

       When a large number of containers are nested within a VM, it may
       be too expensive to dedicate a VIF to each container. OVN can use
       VLAN tags to support such cases. Each container is assigned a
       VLAN ID and each packet that passes between the hypervisor and
       the VM is tagged with the appropriate ID for the container. Such
       VLAN IDs never appear on a physical wire, even inside a tunnel,
       so they need not be unique except relative to a single VM on a
       hypervisor.

       These columns are used for VIFs that represent nested containers
       using shared VIFs. For VMs and for containers that have dedicated
       VIFs, they are empty.

       parent_name: optional string
              The VM interface through which the nested container sends
              its network traffic. This must match the name column for
              some other Logical_Switch_Port. Note: for performance of
              the OVN Southbound database conditional monitoring, unlike
              for regular VIFs, ovn-controller will register to get
              updates about all OVN Southbound database Port_Binding
              table records that correspond to nested container ports
              even if external_ids:ovn-monitor-all is set to false. See
              ovn-controller(8) for more information.

       tag_request: optional integer, in range 0 to 4,095
              The VLAN tag in the network traffic associated with a
              container’s network interface. The client can request
              ovn-northd to allocate a tag that is unique within the
              scope of a specific parent (specified in parent_name) by
              setting a value of 0 in this column. The allocated value
              is written by ovn-northd in the tag column. (Note that
              these tags are allocated and managed locally in
              ovn-northd, so they cannot be reconstructed in the event
              that the database is lost.) The client can also request a
              specific non-zero tag and ovn-northd will honor it and
              copy that value to the tag column.

              When type is set to localnet or l2gateway, this can be set
              to indicate that the port represents a connection to a
              specific VLAN on a locally accessible network. The VLAN ID
              is used to match incoming traffic and is also added to
              outgoing traffic.

       tag: optional integer, in range 1 to 4,095
              The VLAN tag allocated by ovn-northd based on the contents
              of the tag_request column.

     Port State:

       up: optional boolean
              This column is populated by ovn-northd, rather than by the
              CMS plugin as is most of this database. When a logical
              port is bound to a physical location in the OVN Southbound
              database Binding table, ovn-northd sets this column to
              true; otherwise, or if the port becomes unbound later, it
              sets it to false. If this column is empty, the port is not
              considered up. This allows the CMS to wait for a VM’s (or
              container’s) networking to become active before it allows
              the VM (or container) to start.

              Logical ports of router type are an exception to this
              rule. They are considered to be always up, that is this
              column is always set to true.

       enabled: optional boolean
              This column is used to administratively set port state. If
              this column is empty or is set to true, the port is
              enabled. If this column is set to false, the port is
              disabled. A disabled port has all ingress and egress
              traffic dropped.

     Addressing:

       addresses: set of strings
              Addresses owned by the logical port.

              Each element in the set must take one of the following
              forms:

              Ethernet address followed by zero or more IPv4 or IPv6
              addresses (or both)
                     An Ethernet address defined is owned by the logical
                     port. Like a physical Ethernet NIC, a logical port
                     ordinarily has a single fixed Ethernet address.

                     When a OVN logical switch processes a unicast
                     Ethernet frame whose destination MAC address is in
                     a logical port’s addresses column, it delivers it
                     only to that port, as if a MAC learning process had
                     learned that MAC address on the port.

                     If IPv4 or IPv6 address(es) (or both) are defined,
                     it indicates that the logical port owns the given
                     IP addresses.

                     If IPv4 address(es) are defined, the OVN logical
                     switch uses this information to synthesize
                     responses to ARP requests without traversing the
                     physical network. The OVN logical router connected
                     to the logical switch, if any, uses this
                     information to avoid issuing ARP requests for
                     logical switch ports.

                     Note that the order here is important. The Ethernet
                     address must be listed before the IP address(es) if
                     defined.

                     Examples:

                     80:fa:5b:06:72:b7
                            This indicates that the logical port owns
                            the above mac address.

                     80:fa:5b:06:72:b7 10.0.0.4 20.0.0.4
                            This indicates that the logical port owns
                            the mac address and two IPv4 addresses.

                     80:fa:5b:06:72:b7
                     fdaa:15f2:72cf:0:f816:3eff:fe20:3f41
                            This indicates that the logical port owns
                            the mac address and 1 IPv6 address.

                     80:fa:5b:06:72:b7 10.0.0.4
                     fdaa:15f2:72cf:0:f816:3eff:fe20:3f41
                            This indicates that the logical port owns
                            the mac address and 1 IPv4 address and 1
                            IPv6 address.

              unknown
                     This indicates that the logical port has an unknown
                     set of Ethernet addresses. When an OVN logical
                     switch processes a unicast Ethernet frame whose
                     destination MAC address is not in any logical
                     port’s addresses column, it delivers it to the port
                     (or ports) whose addresses columns include unknown.

              dynamic
                     Use dynamic to make ovn-northd generate a globally
                     unique MAC address, choose an unused IPv4 address
                     with the logical port’s subnet (if
                     other_config:subnet is set in the port’s
                     Logical_Switch), and generate an IPv6 address from
                     the MAC address (if other_config:ipv6_prefix is set
                     in the port’s Logical_Switch) and store them in the
                     port’s dynamic_addresses column.

                     Only one element containing dynamic may appear in
                     addresses.

              dynamic ip
              dynamic ipv6
              dynamic ip ipv6
                   These act like dynamic alone but specify particular
                   IPv4 or IPv6 addresses to use. OVN IPAM will still
                   automatically allocate the other address if
                   configured appropriately. Example: dynamic
                   192.168.0.1 2001::1.

              mac dynamic
                   This acts like dynamic alone but specifies a
                   particular MAC address to use. OVN IPAM will still
                   automatically allocate IPv4 or IPv6 addresses, or
                   both, if configured appropriately. Example:
                   80:fa:5b:06:72:b7 dynamic

              router
                   Accepted only when type is router. This indicates
                   that the Ethernet, IPv4, and IPv6 addresses for this
                   logical switch port should be obtained from the
                   connected logical router port, as specified by
                   router-port in options.

                   The resulting addresses are used to populate the
                   logical switch’s destination lookup, and also for the
                   logical switch to generate ARP and ND replies.

                   If the connected logical router port has a
                   distributed gateway port specified and the logical
                   router has rules specified in nat with external_mac,
                   then those addresses are also used to populate the
                   switch’s destination lookup.

                   Supported only in OVN 2.7 and later. Earlier versions
                   required router addresses to be manually
                   synchronized.

       dynamic_addresses: optional string
              Addresses assigned to the logical port by ovn-northd, if
              dynamic is specified in addresses. Addresses will be of
              the same format as those that populate the addresses
              column. Note that dynamically assigned addresses are
              constructed and managed locally in ovn-northd, so they
              cannot be reconstructed in the event that the database is
              lost.

       port_security: set of strings
              This column controls the addresses from which the host
              attached to the logical port (``the host’’) is allowed to
              send packets and to which it is allowed to receive
              packets. If this column is empty, all addresses are
              permitted.

              Each element in the set must begin with one Ethernet
              address. This would restrict the host to sending packets
              from and receiving packets to the ethernet addresses
              defined in the logical port’s port_security column. It
              also restricts the inner source MAC addresses that the
              host may send in ARP and IPv6 Neighbor Discovery packets.
              The host is always allowed to receive packets to multicast
              and broadcast Ethernet addresses.

              Each element in the set may additionally contain one or
              more IPv4 or IPv6 addresses (or both), with optional
              masks. If a mask is given, it must be a CIDR mask. In
              addition to the restrictions described for Ethernet
              addresses above, such an element restricts the IPv4 or
              IPv6 addresses from which the host may send and to which
              it may receive packets to the specified addresses. A
              masked address, if the host part is zero, indicates that
              the host is allowed to use any address in the subnet; if
              the host part is nonzero, the mask simply indicates the
              size of the subnet. In addition:

              •      If any IPv4 address is given, the host is also
                     allowed to receive packets to the IPv4 local
                     broadcast address 255.255.255.255 and to IPv4
                     multicast addresses (224.0.0.0/4). If an IPv4
                     address with a mask is given, the host is also
                     allowed to receive packets to the broadcast address
                     in that specified subnet.

                     If any IPv4 address is given, the host is
                     additionally restricted to sending ARP packets with
                     the specified source IPv4 address. (RARP is not
                     restricted.)

              •      If any IPv6 address is given, the host is also
                     allowed to receive packets to IPv6 multicast
                     addresses (ff00::/8).

                     If any IPv6 address is given, the host is
                     additionally restricted to sending IPv6 Neighbor
                     Discovery Solicitation or Advertisement packets
                     with the specified source address or, for
                     solicitations, the unspecified address.

              If an element includes an IPv4 address, but no IPv6
              addresses, then IPv6 traffic is not allowed. If an element
              includes an IPv6 address, but no IPv4 address, then IPv4
              and ARP traffic is not allowed.

              This column uses the same lexical syntax as the match
              column in the OVN Southbound database’s Pipeline table.
              Multiple addresses within an element may be space or comma
              separated.

              This column is provided as a convenience to cloud
              management systems, but all of the features that it
              implements can be implemented as ACLs using the ACL table.

              Examples:

              80:fa:5b:06:72:b7
                     The host may send traffic from and receive traffic
                     to the specified MAC address, and to receive
                     traffic to Ethernet multicast and broadcast
                     addresses, but not otherwise. The host may not send
                     ARP or IPv6 Neighbor Discovery packets with inner
                     source Ethernet addresses other than the one
                     specified.

              80:fa:5b:06:72:b7 192.168.1.10/24
                     This adds further restrictions to the first
                     example. The host may send IPv4 packets from or
                     receive IPv4 packets to only 192.168.1.10, except
                     that it may also receive IPv4 packets to
                     192.168.1.255 (based on the subnet mask),
                     255.255.255.255, and any address in 224.0.0.0/4.
                     The host may not send ARPs with a source Ethernet
                     address other than 80:fa:5b:06:72:b7 or source IPv4
                     address other than 192.168.1.10. The host may not
                     send or receive any IPv6 (including IPv6 Neighbor
                     Discovery) traffic.

              "80:fa:5b:12:42:ba", "80:fa:5b:06:72:b7 192.168.1.10/24"
                     The host may send traffic from and receive traffic
                     to the specified MAC addresses, and to receive
                     traffic to Ethernet multicast and broadcast
                     addresses, but not otherwise. With MAC
                     80:fa:5b:12:42:ba, the host may send traffic from
                     and receive traffic to any L3 address. With MAC
                     80:fa:5b:06:72:b7, the host may send IPv4 packets
                     from or receive IPv4 packets to only 192.168.1.10,
                     except that it may also receive IPv4 packets to
                     192.168.1.255 (based on the subnet mask),
                     255.255.255.255, and any address in 224.0.0.0/4.
                     The host may not send or receive any IPv6
                     (including IPv6 Neighbor Discovery) traffic.

     DHCP:

       dhcpv4_options: optional weak reference to DHCP_Options
              This column defines the DHCPv4 Options to be included by
              the ovn-controller when it replies to the DHCPv4 requests.
              Please see the DHCP_Options table.

       dhcpv6_options: optional weak reference to DHCP_Options
              This column defines the DHCPv6 Options to be included by
              the ovn-controller when it replies to the DHCPv6 requests.
              Please see the DHCP_Options table.

       mirror_rules: set of weak reference to Mirrors
              Mirror rules that apply to logical switch port which is
              the source. Please see the Mirror table.

       ha_chassis_group: optional HA_Chassis_Group
              References a row in the OVN Northbound database’s
              HA_Chassis_Group table. It indicates the HA chassis group
              to use if the type is set to external. If type is not
              external, this column is ignored.

     Naming:

       external_ids : neutron:port_name: optional string
              This column gives an optional human-friendly name for the
              port. This name has no special meaning or purpose other
              than to provide convenience for human interaction with the
              northbound database.

              Neutron copies this from its own port object’s name.
              (Neutron ports do are not assigned human-friendly names by
              default, so it will often be empty.)

     Tunnel Key:

       options : requested-tnl-key: optional string, containing an
       integer, in range 1 to 32,767
              Configures the port binding tunnel key for the port.
              Usually this is not needed because ovn-northd will assign
              an unique key for each port by itself. However, if it is
              configured, ovn-northd honors the configured value. The
              typical use case is for interconnection: the tunnel keys
              for ports on transit switches need to be unique globally,
              so they are maintained in the global OVN_IC_Southbound
              database, and ovn-ic simply syncs the value from
              OVN_IC_Southbound through this config.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

              The ovn-northd program copies all these pairs into the
              external_ids column of the Port_Binding table in
              OVN_Southbound database.

Forwarding_Group TABLE         top

       Each row represents one forwarding group.

   Summary:
       name                          string
       vip                           string
       vmac                          string
       liveness                      boolean
       child_port                    set of 1 or more strings
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       name: string
              A name for the forwarding group. This name has no special
              meaning or purpose other than to provide convenience for
              human interaction with the ovn-nb database.

       vip: string
              The virtual IP address assigned to the forwarding group.
              It will respond with vmac when an ARP request is sent for
              vip.

       vmac: string
              The virtual MAC address assigned to the forwarding group.

       liveness: boolean
              If set to true, liveness is enabled for child ports
              otherwise it is disabled.

       child_port: set of 1 or more strings
              List of child ports in the forwarding group.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

Address_Set TABLE         top

       Each row in this table represents a named set of addresses. An
       address set may contain Ethernet, IPv4, or IPv6 addresses with
       optional bitwise or CIDR masks. Address set may ultimately be
       used in ACLs to compare against fields such as ip4.src or
       ip6.src. A single address set must contain addresses of the same
       type. As an example, the following would create an address set
       with three IP addresses:

             ovn-nbctl create Address_Set name=set1 addresses=’10.0.0.1 10.0.0.2 10.0.0.3’

       Address sets may be used in the match column of the ACL table.
       For syntax information, see the details of the expression
       language used for the match column in the Logical_Flow table of
       the OVN_Southbound database.

   Summary:
       name                          string (must be unique within
                                     table)
       addresses                     set of strings
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       name: string (must be unique within table)
              A name for the address set. Names are ASCII and must match
              [a-zA-Z_.][a-zA-Z_.0-9]*.

       addresses: set of strings
              The set of addresses in string form.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

Port_Group TABLE         top

       Each row in this table represents a named group of logical switch
       ports.

       Port groups may be used in the match column of the ACL table. For
       syntax information, see the details of the expression language
       used for the match column in the Logical_Flow table of the
       OVN_Southbound database.

       For each port group, there are two address sets generated to the
       Address_Set table of the OVN_Southbound database, containing the
       IP addresses of the group of ports, one for IPv4, and the other
       for IPv6, with name being the name of the Port_Group followed by
       a suffix _ip4 for IPv4 and _ip6 for IPv6. The generated address
       sets can be used in the same way as regular address sets in the
       match column of the ACL table. For syntax information, see the
       details of the expression language used for the match column in
       the Logical_Flow table of the OVN_Southbound database.

   Summary:
       name                          string (must be unique within
                                     table)
       ports                         set of weak reference to
                                     Logical_Switch_Ports
       acls                          set of ACLs
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       name: string (must be unique within table)
              A name for the port group. Names are ASCII and must match
              [a-zA-Z_.][a-zA-Z_.0-9]*.

       ports: set of weak reference to Logical_Switch_Ports
              The logical switch ports belonging to the group in uuids.

       acls: set of ACLs
              Access control rules that apply to the port group.
              Applying an ACL to a port group has the same effect as
              applying the ACL to all logical lswitches that the ports
              of the port group belong to.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

Load_Balancer TABLE         top

       Each row represents one load balancer.

   Summary:
       name                          string
       vips                          map of string-string pairs
       protocol                      optional string, one of sctp, tcp,
                                     or udp
       Health Checks:
         health_check                set of Load_Balancer_Health_Checks
         ip_port_mappings            map of string-string pairs
       selection_fields              set of strings, one of eth_dst,
                                     eth_src, ip_dst, ip_src, tp_dst, or
                                     tp_src
       Common Columns:
         external_ids                map of string-string pairs
       Load_Balancer options:
         options : reject            optional string, either true or
                                     false
         options : hairpin_snat_ip   optional string
         options : skip_snat         optional string
         options : add_route         optional string
         options : neighbor_responder
                                     optional string
         options : template          optional string
         options : address-family    optional string
         options : affinity_timeout  optional string
         options : ct_flush          optional string, either true or
                                     false

   Details:
       name: string
              A name for the load balancer. This name has no special
              meaning or purpose other than to provide convenience for
              human interaction with the ovn-nb database.

       vips: map of string-string pairs
              A map of virtual IP addresses (and an optional port number
              with : as a separator) associated with this load balancer
              and their corresponding endpoint IP addresses (and
              optional port numbers with : as separators) separated by
              commas. If the destination IP address (and port number) of
              a packet leaving a container or a VM matches the virtual
              IP address (and port number) provided here as a key, then
              OVN will statefully replace the destination IP address by
              one of the provided IP address (and port number) in this
              map as a value. IPv4 and IPv6 addresses are supported for
              load balancing; however a VIP of one address family may
              not be mapped to a destination IP address of a different
              family. If specifying an IPv6 address with a port, the
              address portion must be enclosed in square brackets.
              Examples for keys are "192.168.1.4" and "[fd0f::1]:8800".
              Examples for value are "10.0.0.1, 10.0.0.2" and
              "20.0.0.10:8800, 20.0.0.11:8800".

              When the Load_Balancer is added to the logical_switch, the
              VIP has to be in a different subnet than the one used for
              the logical_switch. Since VIP is in a different subnet,
              you should connect your logical switch to either a OVN
              logical router or a real router (this is because the
              client can now send a packet with VIP as the destination
              IP address and router’s mac address as the destination MAC
              address).

       protocol: optional string, one of sctp, tcp, or udp
              Valid protocols are tcp, udp, or sctp. This column is
              useful when a port number is provided as part of the vips
              column. If this column is empty and a port number is
              provided as part of vips column, OVN assumes the protocol
              to be tcp.

     Health Checks:

       OVN supports health checks for load balancer endpoints. When
       health checks are enabled, the load balancer uses only healthy
       endpoints.

       Suppose that vips contains a key-value pair
       10.0.0.10:80=10.0.0.4:8080,20.0.0.4:8080. To enable health checks
       for this virtual’s endpoints, add two key-value pairs to
       ip_port_mappings, with keys 10.0.0.4 and 20.0.0.4, and add to
       health_check a reference to a Load_Balancer_Health_Check row
       whose vip is set to 10.0.0.10. The same approach can be used for
       IPv6 as well.

       health_check: set of Load_Balancer_Health_Checks
              Load balancer health checks associated with this load
              balancer.

       ip_port_mappings: map of string-string pairs
              Maps from endpoint IP to a colon-separated pair of logical
              port name and source IP, e.g. port_name:sourc_ip for IPv4.
              Health checks are sent to this port with the specified
              source IP. For IPv6 square brackets must be used around IP
              address, e.g: port_name:[sourc_ip]

              For example, in the example above, IP to port mappings
              might be defined as 10.0.0.4=sw0-p1:10.0.0.2 and
              20.0.0.4=sw1-p1:20.0.0.2, if the values given were
              suitable ports and IP addresses.

              For IPv6 IP to port mappings might be defined as
              [2001::1]=sw0-p1:[2002::1].

       selection_fields: set of strings, one of eth_dst, eth_src,
       ip_dst, ip_src, tp_dst, or tp_src
              OVN native load balancers are supported using the OpenFlow
              groups of type select. OVS supports two selection methods:
              dp_hash and hash (with optional fields specified) in
              selecting the buckets of a group. Please see the OVS
              documentation (man ovs-ofctl) for more details on the
              selection methods. Each endpoint IP (and port if set) is
              mapped to a bucket in the group flow.

              CMS can choose the hash selection method by setting the
              selection fields in this column. ovs-vswitchd uses the
              specified fields in generating the hash.

              dp_hash selection method uses the assistance of datapath
              to calculate the hash and it is expected to be faster than
              hash selection method. So CMS should take this into
              consideration before using the hash method. Please consult
              the OVS documentation and OVS sources for the
              implementation details.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

     Load_Balancer options:

       options : reject: optional string, either true or false
              If the load balancer is created with --reject option and
              it has no active backends, a TCP reset segment (for tcp)
              or an ICMP port unreachable packet (for all other kind of
              traffic) will be sent whenever an incoming packet is
              received for this load-balancer. Please note using
              --reject option will disable empty_lb SB controller event
              for this load balancer.

       options : hairpin_snat_ip: optional string
              IP to be used as source IP for packets that have been
              hair-pinned after load balancing. The default behavior
              when the option is not set is to use the load balancer VIP
              as source IP. This option may have exactly one IPv4 and/or
              one IPv6 address on it, separated by a space character.

       options : skip_snat: optional string
              If the load balancing rule is configured with skip_snat
              option, the option lb_force_snat_ip configured for the
              logical router that references this load balancer will not
              be applied for this load balancer.

       options : add_route: optional string
              If set to true, then neighbor routers will have logical
              flows added that will allow for routing to the VIP IP. It
              also will have ARP resolution logical flows added. By
              setting this option, it means there is no reason to create
              a Logical_Router_Static_Route from neighbor routers to
              this NAT address. It also means that no ARP request is
              required for neighbor routers to learn the IP-MAC mapping
              for this VIP IP. For more information about what flows are
              added for IP routes, please see the ovn-northd manpage
              section on IP Routing.

       options : neighbor_responder: optional string
              If set to all, then routers on which the load balancer is
              applied reply to ARP/neighbor discovery requests for all
              VIPs of the load balancer. If set to reachable, then
              routers on which the load balancer is applied reply to
              ARP/neighbor discovery requests only for VIPs that are
              part of a router’s subnet. If set to none, then routers on
              which the load balancer is applied never reply to
              ARP/neighbor discovery requests for any of the load
              balancer VIPs. Load balancers with options:template=true
              do not support reachable as a valid mode. The default
              value of this option, if not specified, is reachable for
              regular load balancers and none for template load
              balancers.

       options : template: optional string
              Option to be set to true, if the load balancer is a
              template. The load balancer VIPs and backends must be
              using Chassis_Template_Var in their definitions.

              Load balancer template VIP supported formats are:

              ^VIP_VAR[:^PORT_VAR|:port]

              where VIP_VAR and PORT_VAR are keys of the
              Chassis_Template_Var variables records.

              Note: The VIP and PORT cannot be combined into a single
              template variable. For example, a Chassis_Template_Var
              variable expanding to 10.0.0.1:8080 is not valid if used
              as VIP.

              Load balancer template backend supported formats are:

              ^BACKEND_VAR1[:^PORT_VAR1|:port],^BACKEND_VAR2[:^PORT_VAR2|:port]
              or
              ^BACKENDS_VAR1,^BACKENDS_VAR2

              where BACKEND_VAR1, PORT_VAR1, BACKEND_VAR2, PORT_VAR2,
              BACKENDS_VAR1 and BACKENDS_VAR2 are keys of the
              Chassis_Template_Var variables records.

       options : address-family: optional string
              Address family used by the load balancer. Supported values
              are ipv4 and ipv6. The address-family is only used for
              load balancers with options:template=true. For explicit
              load balancers, setting the address-family has no effect.

       options : affinity_timeout: optional string
              If the CMS provides a positive value (in seconds) for
              affinity_timeout, OVN will dnat connections received from
              the same client to this lb to the same backend if received
              in the affinity timeslot. Max supported affinity_timeout
              is 65535 seconds.

       options : ct_flush: optional string, either true or false
              The value indicates whether ovn-controller should flush CT
              entries that are related to this LB. The flush happens if
              the LB is removed, any of the backends is updated/removed
              or the LB is not considered local anymore by the ovn-
              controller. This option is set to false by default.

Load_Balancer_Group TABLE         top

       Each row represents a logical grouping of load balancers. It is
       up to the CMS to decide the criteria on which load balancers are
       grouped together. To simplify configuration and to optimize its
       processing load balancers that must be associated to the same set
       of logical switches and/or logical routers should be grouped
       together.

   Summary:
       name                          string (must be unique within
                                     table)
       load_balancer                 set of weak reference to
                                     Load_Balancers

   Details:
       name: string (must be unique within table)
              A name for the load balancer group. This name has no
              special meaning or purpose other than to provide
              convenience for human interaction with the ovn-nb
              database.

       load_balancer: set of weak reference to Load_Balancers
              A set of load balancers.

Load_Balancer_Health_Check TABLE         top

       Each row represents one load balancer health check.

   Summary:
       vip                           string
       Health check options:
         options : interval          optional string, containing an
                                     integer
         options : timeout           optional string, containing an
                                     integer
         options : success_count     optional string, containing an
                                     integer
         options : failure_count     optional string, containing an
                                     integer
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       vip: string
              vip whose endpoints should be monitored for health check.

     Health check options:

       options : interval: optional string, containing an integer
              The interval, in seconds, between health checks.

       options : timeout: optional string, containing an integer
              The time, in seconds, after which a health check times
              out.

       options : success_count: optional string, containing an integer
              The number of successful checks after which the endpoint
              is considered online.

       options : failure_count: optional string, containing an integer
              The number of failure checks after which the endpoint is
              considered offline.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

ACL TABLE         top

       Each row in this table represents one ACL rule for a logical
       switch or a port group that points to it through its acls column.
       The action column for the highest-priority matching row in this
       table determines a packet’s treatment. If no row matches, packets
       are allowed by default. (Default-deny treatment is possible: add
       a rule with priority 0, 1 as match, and deny as action.)

   Summary:
       label                         integer, in range 0 to
                                     4,294,967,295
       priority                      integer, in range 0 to 32,767
       direction                     string, either from-lport or
                                     to-lport
       match                         string
       action                        string, one of allow-related,
                                     allow-stateless, allow, drop, pass,
                                     or reject
       tier                          integer, in range 0 to 3
       options:
         options : apply-after-lb    optional string
       Logging:
         log                         boolean
         name                        optional string, at most 63
                                     characters long
         severity                    optional string, one of alert,
                                     debug, info, notice, or warning
         meter                       optional string
       Common Columns:
         options                     map of string-string pairs
         ACL configuration options:
            options : log-related    optional string
         external_ids                map of string-string pairs

   Details:
       label: integer, in range 0 to 4,294,967,295
              Associates an identifier with the ACL. The same value will
              be written to corresponding connection tracker entry. The
              value should be a valid 32-bit unsigned integer. This
              value can help in debugging from connection tracker side.
              For example, through this "label" we can backtrack to the
              ACL rule which is causing a "leaked" connection.
              Connection tracker entries are created only for allowed
              connections so the label is valid only for allow and
              allow-related actions.

       priority: integer, in range 0 to 32,767
              The ACL rule’s priority. Rules with numerically higher
              priority take precedence over those with lower. If two ACL
              rules with the same priority both match, then the one
              actually applied to a packet is undefined.

              Return traffic from an allow-related flow is always
              allowed and cannot be changed through an ACL.

              allow-stateless flows always take precedence before
              stateful ACLs, regardless of their priority. (Both allow
              and allow-related ACLs can be stateful.)

       direction: string, either from-lport or to-lport
              Direction of the traffic to which this rule should apply:

              •      from-lport: Used to implement filters on traffic
                     arriving from a logical port. These rules are
                     applied to the logical switch’s ingress pipeline.

              •      to-lport: Used to implement filters on traffic
                     forwarded to a logical port. These rules are
                     applied to the logical switch’s egress pipeline.

       match: string
              The packets that the ACL should match, in the same
              expression language used for the match column in the OVN
              Southbound database’s Logical_Flow table. The outport
              logical port is only available in the to-lport direction
              (the inport is available in both directions).

              By default all traffic is allowed. When writing a more
              restrictive policy, it is important to remember to allow
              flows such as ARP and IPv6 neighbor discovery packets.

              Note that you can not create an ACL matching on a port
              with type=router or type=localnet.

       action: string, one of allow-related, allow-stateless, allow,
       drop, pass, or reject
              The action to take when the ACL rule matches:

              •      allow-stateless: Always forward the packet in
                     stateless manner, omitting connection tracking
                     mechanism, regardless of other rules defined for
                     the switch. May require defining additional rules
                     for inbound replies. For example, if you define a
                     rule to allow outgoing TCP traffic directed to an
                     IP address, then you probably also want to define
                     another rule to allow incoming TCP traffic coming
                     from this same IP address. In addition, traffic
                     that matches stateless ACLs will bypass load-
                     balancer DNAT/un-DNAT processing. Stateful ACLs
                     should be used instead if the traffic is supposed
                     to be load-balanced.

              •      allow: Forward the packet. It will also send the
                     packets through connection tracking when
                     allow-related rules exist on the logical switch.
                     Otherwise, it’s equivalent to allow-stateless.

              •      allow-related: Forward the packet and related
                     traffic (e.g. inbound replies to an outbound
                     connection).

              •      drop: Silently drop the packet.

              •      reject: Drop the packet, replying with a RST for
                     TCP or ICMPv4/ICMPv6 unreachable message for other
                     IPv4/IPv6-based protocols.

              •      pass: Pass to the next ACL tier. If using multiple
                     ACL tiers, a match on this ACL will stop evaluating
                     ACLs at the current tier and move to the next one.
                     If not using ACL tiers or if a pass ACL is matched
                     at the final tier, then the
                     options:default_acl_drop option from the NB_Global
                     table is used to determine how to proceed.

       tier: integer, in range 0 to 3
              The hierarchical tier that this ACL belongs to.

              ACLs can be assigned to numerical tiers. When evaluating
              ACLs, an internal counter is used to determine which tier
              of ACLs should be evaluated. Tier 0 ACLs are evaluated
              first. If no verdict can be determined, then tier 1 ACLs
              are evaluated next. This continues until the maximum tier
              value is reached. If all tiers of ACLs are evaluated and
              no verdict is reached, then the options:default_acl_drop
              option from table NB_Global is used to determine how to
              proceed.

              In this version of OVN, the maximum tier value for ACLs is
              3, meaning there are 4 tiers of ACLs allowed (0-3).

     options:

       ACLs options.

       options : apply-after-lb: optional string
              If set to true, the ACL will be applied after load
              balancing stage. Supported only for from-lport direction.

              The main use case of this option is to support ACLs
              matching on the destination IP address of the packet for
              the backend IPs of load balancers.

              OVN will apply the from-lport ACLs in two stages. ACLs
              without this option apply-after-lb set, will be applied
              before the load balancer stage and ACLs with this option
              set will be applied after the load balancer stage. The
              priorities are indepedent between these stages and may not
              be obvious to the CMS. Hence CMS should be extra careful
              when using this option and should carefully evaluate the
              priorities of all the ACLs and the default deny/allow ACLs
              if any.

     Logging:

       These columns control whether and how OVN logs packets that match
       an ACL.

       log: boolean
              If set to true, packets that match the ACL will trigger a
              log message on the transport node or nodes that perform
              ACL processing. Logging may be combined with any action.

              If set to false, the remaining columns in this group have
              no significance.

       name: optional string, at most 63 characters long
              This name, if it is provided, is included in log records.
              It provides the administrator and the cloud management
              system a way to associate a log record with a particular
              ACL.

       severity: optional string, one of alert, debug, info, notice, or
       warning
              The severity of the ACL. The severity levels match those
              of syslog, in decreasing level of severity: alert,
              warning, notice, info, or debug. When the column is empty,
              the default is info.

       meter: optional string
              The name of a meter to rate-limit log messages for the
              ACL. The string must match the name column of a row in the
              Meter table. By default, log messages are not rate-
              limited. In order to ensure that the same Meter rate
              limits multiple ACL logs separately, set the fair column.

     Common Columns:

       options: map of string-string pairs
              This column provides general key/value settings. The
              supported options are described individually below.

     ACL configuration options:

       options : log-related: optional string
              If set to true, then log when reply or related traffic is
              admitted from a stateful ACL. In order for this option to
              function, the log option must be set to true and a label
              must be set, and it must be unique to the ACL. The label
              is necessary as it is the only means to associate the
              reply traffic with the ACL to which it belongs. It must be
              unique, because otherwise it is ambiguous which ACL will
              be matched. Note: If this option is enabled, an extra flow
              is installed in order to log the related traffic.
              Therefore, if this is enabled on all ACLs, then the total
              number of flows necessary to log the ACL traffic is
              doubled, compared to if this option is not enabled.

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

Logical_Router TABLE         top

       Each row represents one L3 logical router.

   Summary:
       ports                         set of Logical_Router_Ports
       static_routes                 set of Logical_Router_Static_Routes
       policies                      set of Logical_Router_Policys
       enabled                       optional boolean
       nat                           set of NATs
       load_balancer                 set of weak reference to
                                     Load_Balancers
       load_balancer_group           set of Load_Balancer_Groups
       Naming:
         name                        string
         external_ids : neutron:router_name
                                     optional string
       copp                          optional weak reference to Copp
       Options:
         options : chassis           optional string
         options : dnat_force_snat_ip
                                     optional string
         options : lb_force_snat_ip  optional string
         options : mcast_relay       optional string, either true or
                                     false
         options : dynamic_neigh_routers
                                     optional string, either true or
                                     false
         options : always_learn_from_arp_request
                                     optional string, either true or
                                     false
         options : requested-tnl-key
                                     optional string, containing an
                                     integer, in range 1 to 16,777,215
         options : snat-ct-zone      optional string, containing an
                                     integer, in range 0 to 65,535
         options : mac_binding_age_threshold
                                     optional string
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       ports: set of Logical_Router_Ports
              The router’s ports.

       static_routes: set of Logical_Router_Static_Routes
              Zero or more static routes for the router.

       policies: set of Logical_Router_Policys
              Zero or more routing policies for the router.

       enabled: optional boolean
              This column is used to administratively set router state.
              If this column is empty or is set to true, the router is
              enabled. If this column is set to false, the router is
              disabled. A disabled router has all ingress and egress
              traffic dropped.

       nat: set of NATs
              One or more NAT rules for the router. NAT rules only work
              on Gateway routers, and on distributed routers with one
              and only one distributed gateway port.

       load_balancer: set of weak reference to Load_Balancers
              Set of load balancers associated to this logical router.
              Load balancer Load balancer rules only work on the Gateway
              routers or routers with one and only one distributed
              gateway port.

       load_balancer_group: set of Load_Balancer_Groups
              Set of load balancers groups associated to this logical
              router.

     Naming:

       These columns provide names for the logical router. From OVN’s
       perspective, these names have no special meaning or purpose other
       than to provide convenience for human interaction with the
       northbound database. There is no requirement for the name to be
       unique. (For a unique identifier for a logical router, use its
       row UUID.)

       (Originally, name was intended to serve the purpose of a human-
       friendly name, but the Neutron integration used it to uniquely
       identify its own router object, in the format neutron-uuid. Later
       on, Neutron started propagating the friendly name of a router as
       external_ids:neutron:router_name. Perhaps this can be cleaned up
       someday.)

       name: string
              A name for the logical router.

       external_ids : neutron:router_name: optional string
              Another name for the logical router.

       copp: optional weak reference to Copp
              The control plane protection policy from table Copp used
              for metering packets sent to ovn-controller from logical
              ports of this router.

     Options:

       Additional options for the logical router.

       options : chassis: optional string
              If set, indicates that the logical router in question is a
              Gateway router (which is centralized) and resides in the
              set chassis. The same value is also used by ovn-controller
              to uniquely identify the chassis in the OVN deployment and
              comes from external_ids:system-id in the Open_vSwitch
              table of Open_vSwitch database.

              The Gateway router can only be connected to a distributed
              router via a switch if SNAT and DNAT are to be configured
              in the Gateway router.

       options : dnat_force_snat_ip: optional string
              If set, indicates a set of IP addresses to use to force
              SNAT a packet that has already been DNATed in the gateway
              router. When multiple gateway routers are configured, a
              packet can potentially enter any of the gateway router,
              get DNATted and eventually reach the logical switch port.
              For the return traffic to go back to the same gateway
              router (for unDNATing), the packet needs a SNAT in the
              first place. This can be achieved by setting the above
              option with a gateway specific set of IP addresses. This
              option may have exactly one IPv4 and/or one IPv6 address
              on it, separated by a a space.

       options : lb_force_snat_ip: optional string
              If set, this option can take two possible type of values.
              Either a set of IP addresses or the string value -
              router_ip.

              If a set of IP addresses are configured, it indicates to
              use to force SNAT a packet that has already been load-
              balanced in the gateway router. When multiple gateway
              routers are configured, a packet can potentially enter any
              of the gateway routers, get DNATted as part of the load-
              balancing and eventually reach the logical switch port.
              For the return traffic to go back to the same gateway
              router (for unDNATing), the packet needs a SNAT in the
              first place. This can be achieved by setting the above
              option with a gateway specific set of IP addresses. This
              option may have exactly one IPv4 and/or one IPv6 address
              on it, separated by a space character.

              If it is configured with the value router_ip, then the
              load balanced packet is SNATed with the IP of router port
              (attached to the gateway router) selected as the
              destination after taking the routing decision.

       options : mcast_relay: optional string, either true or false
              Enables/disables IP multicast relay between logical
              switches connected to the logical router. Default: False.

       options : dynamic_neigh_routers: optional string, either true or
       false
              If set to true, the router will resolve neighbor routers’
              MAC addresses only by dynamic ARP/ND, instead of
              prepopulating static mappings for all neighbor routers in
              the ARP/ND Resolution stage. This reduces number of flows,
              but requires ARP/ND messages to resolve the IP-MAC
              bindings when needed. It is false by default. It is
              recommended to set to true when a large number of logical
              routers are connected to the same logical switch but most
              of them never need to send traffic between each other. By
              default, ovn-northd does not create mappings to NAT and
              load balancer addresess. However, for NAT and load
              balancer addresses that have the add_route option added,
              ovn-northd will create logical flows that map NAT and load
              balancer IP addresses to the appropriate MAC address.
              Setting dynamic_neigh_routers to true will prevent the
              automatic creation of these logical flows.

       options : always_learn_from_arp_request: optional string, either
       true or false
              This option controls the behavior when handling IPv4 ARP
              requests or IPv6 ND-NS packets - whether a dynamic
              neighbor (MAC binding) entry is added/updated.

              true - Always learn the MAC-IP binding, and add/update the
              MAC binding entry.

              false - If there is a MAC binding for that IP and the MAC
              is different, or, if TPA of ARP request belongs to any
              router port on this router, then update/add that MAC-IP
              binding. Otherwise, don’t update/add entries.

              It is true by default. It is recommended to set to false
              when a large number of logical routers are connected to
              the same logical switch but most of them never need to
              send traffic between each other, to reduce the size of the
              MAC binding table.

       options : requested-tnl-key: optional string, containing an
       integer, in range 1 to 16,777,215
              Configures the datapath tunnel key for the logical router.
              This is not needed because ovn-northd will assign an
              unique key for each datapath by itself. However, if it is
              configured, ovn-northd honors the configured value.

       options : snat-ct-zone: optional string, containing an integer,
       in range 0 to 65,535
              Use the requested conntrack zone for SNAT with this
              router. This can be useful if egress traffic from the host
              running OVN comes from both OVN and other sources. This
              way, OVN and the other sources can make use of the same
              conntrack zone.

       options : mac_binding_age_threshold: optional string
              Specifies the MAC binding aging thresholds based on CIDRs,
              with the format: entry[;entry[...]], where each entry has
              the format: [cidr:]thresholdcidr: Can be either an IPv4 or IPv6 CIDR.

              •      threshold: Threshold value in seconds. MAC bindings
                     with IP addresses matching the specified CIDR that
                     exceed this timeout will be automatically removed.

              If an entry is provided without an CIDR (just the
              threshold value), it specifies the default threshold for
              MAC bindings that don’t match any of the given CIDRs. If
              there are multiple default threshold entries in the
              option, the behavior is undefined.

              If there are multiple CIDRs matching a MAC binding IP, the
              one with the longest prefix length takes effect. If there
              are multiple entries with the same CIDR in the option, the
              behavior is undefined.

              If no matching CIDR is found for a MAC binding IP, and no
              default threshold is specified, the behavior defaults to
              the original: the binding will not be removed based on
              age.

              The value can also default to an empty string, which means
              that the aging threshold is disabled. Any string not in
              the above format is regarded as invalid and the aging is
              disabled.

              Example:
              192.168.0.0/16:300;192.168.10.0/24:0;fe80::/10:600;1200

              This sets a threshold of 300 seconds for MAC bindings with
              IP addresses in the 192.168.0.0/16 range, excluding the
              192.168.1.0/24 range (for which the aging is disabled), a
              threshold of 600 seconds for MAC bindings with IP
              addresses in the fe80::/10 IPv6 range, and a default
              threshold of 1200 seconds for all other MAC bindings.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

QoS TABLE         top

       Each row in this table represents one QoS rule for a logical
       switch that points to it through its qos_rules column. Two types
       of QoS are supported: DSCP marking and metering. A match with the
       highest-priority will have QoS applied to it. If the action
       column is specified, then matching packets will have DSCP marking
       applied. If the bandwidth column is specified, then matching
       packets will have metering applied. action and bandwidth are not
       exclusive, so both marking and metering by defined for the same
       QoS entry. If no row matches, packets will not have any QoS
       applied.

   Summary:
       priority                      integer, in range 0 to 32,767
       direction                     string, either from-lport or
                                     to-lport
       match                         string
       action                        map of string-integer pairs, key
                                     either dscp or mark, value in range
                                     0 to 4,294,967,295
       bandwidth                     map of string-integer pairs, key
                                     either burst or rate, value in
                                     range 1 to 4,294,967,295
       external_ids                  map of string-string pairs

   Details:
       priority: integer, in range 0 to 32,767
              The QoS rule’s priority. Rules with numerically higher
              priority take precedence over those with lower. If two QoS
              rules with the same priority both match, then the one
              actually applied to a packet is undefined.

       direction: string, either from-lport or to-lport
              The value of this field is similar to ACL column in the
              OVN Northbound database’s ACL table.

       match: string
              The packets that the QoS rules should match, in the same
              expression language used for the match column in the OVN
              Southbound database’s Logical_Flow table. The outport
              logical port is only available in the to-lport direction
              (the inport is available in both directions).

       action: map of string-integer pairs, key either dscp or mark,
       value in range 0 to 4,294,967,295
              When dscp action is specified, matching flows will have
              have DSCP marking applied. When mark action is specified,
              matching flows will have packet marking applied.

              •      dscp: The value of this action should be in the
                     range of 0 to 63 (inclusive).

              •      mark: The value of this action should be a positive
                     integer.

       bandwidth: map of string-integer pairs, key either burst or rate,
       value in range 1 to 4,294,967,295
              When specified, matching packets will have bandwidth
              metering applied. Traffic over the limit will be dropped.

              •      rate: The value of rate limit in kbps.

              •      burst: The value of burst rate limit in kilobits.
                     This is optional and needs to specify the rate.

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

Mirror TABLE         top

       Each row in this table represents a mirror that can be used for
       port mirroring. These mirrors are referenced by the mirror_rules
       column in the Logical_Switch_Port table.

   Summary:
       name                          string (must be unique within
                                     table)
       filter                        string, one of both, from-lport, or
                                     to-lport
       sink                          string
       type                          string, one of erspan, gre, or
                                     local
       index                         integer
       external_ids                  map of string-string pairs

   Details:
       name: string (must be unique within table)
              Represents the name of the mirror.

       filter: string, one of both, from-lport, or to-lport
              The value of this field represents selection criteria of
              the mirror. to-lport mirrors the packets coming into
              logical port. from-lport mirrors the packets going out of
              logical port. both mirrors for both directions.

       sink: string
              The value of this field represents the destination/sink of
              the mirror. If the type is gre or erspan, the value
              indicates the tunnel remote IP (either IPv4 or IPv6). For
              a type of local, this field defines a local interface on
              the OVS integration bridge to be used as the mirror
              destination. The interface must possess external-
              ids:mirror-id that matches this string.

       type: string, one of erspan, gre, or local
              The value of this field specifies the mirror type - gre,
              erspan or local.

       index: integer
              The value of this field represents the tunnel ID. If the
              configured tunnel type is gre, this field represents the
              GRE key value and if the configured tunnel type is erspan
              it represents the erspan_idx value. It is ignored if the
              type is local.

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

Meter TABLE         top

       Each row in this table represents a meter that can be used for
       QoS or rate-limiting.

   Summary:
       name                          string (must be unique within
                                     table)
       unit                          string, either kbps or pktps
       bands                         set of 1 or more Meter_Bands
       fair                          optional boolean
       external_ids                  map of string-string pairs

   Details:
       name: string (must be unique within table)
              A name for this meter.

              Names that begin with "__" (two underscores) are reserved
              for OVN internal use and should not be added manually.

       unit: string, either kbps or pktps
              The unit for rate and burst_rate parameters in the bands
              entry. kbps specifies kilobits per second, and pktps
              specifies packets per second.

       bands: set of 1 or more Meter_Bands
              The bands associated with this meter. Each band specifies
              a rate above which the band is to take the action action.
              If multiple bands’ rates are exceeded, then the band with
              the highest rate among the exceeded bands is selected.

       fair: optional boolean
              This column is used to further describe the desired
              behavior of the meter when there are multiple references
              to it. If this column is empty or is set to false, the
              rate will be shared across all rows that refer to the same
              Meter name. Conversely, when this column is set to true,
              each user of the same Meter will be rate-limited on its
              own.

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

Meter_Band TABLE         top

       Each row in this table represents a meter band which specifies
       the rate above which the configured action should be applied.
       These bands are referenced by the bands column in the Meter
       table.

   Summary:
       action                        string, must be drop
       rate                          integer, in range 1 to
                                     4,294,967,295
       burst_size                    integer, in range 0 to
                                     4,294,967,295
       external_ids                  map of string-string pairs

   Details:
       action: string, must be drop
              The action to execute when this band matches. The only
              supported action is drop.

       rate: integer, in range 1 to 4,294,967,295
              The rate limit for this band, in kilobits per second or
              bits per second, depending on whether the parent Meter
              entry’s unit column specified kbps or pktps.

       burst_size: integer, in range 0 to 4,294,967,295
              The maximum burst allowed for the band in kilobits or
              packets, depending on whether kbps or pktps was selected
              in the parent Meter entry’s unit column. If the size is
              zero, the switch is free to select some reasonable value
              depending on its configuration.

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

Logical_Router_Port TABLE         top

       A port within an L3 logical router.

       Exactly one Logical_Router row must reference a given logical
       router port.

   Summary:
       name                          string (must be unique within
                                     table)
       networks                      set of 1 or more strings
       mac                           string
       enabled                       optional boolean
       dhcp_relay                    optional DHCP_Relay
       Distributed Gateway Ports:
         ha_chassis_group            optional HA_Chassis_Group
         gateway_chassis             set of Gateway_Chassises
         Options for Physical VLAN MTU Issues:
            options : reside-on-redirect-chassis
                                     optional string, either true or
                                     false
            options : redirect-type  optional string, either bridged or
                                     overlay
       ipv6_prefix                   set of strings
       ipv6_ra_configs:
         ipv6_ra_configs : address_mode
                                     optional string
         ipv6_ra_configs : router_preference
                                     optional string
         ipv6_ra_configs : route_info
                                     optional string
         ipv6_ra_configs : mtu       optional string
         ipv6_ra_configs : send_periodic
                                     optional string
         ipv6_ra_configs : max_interval
                                     optional string
         ipv6_ra_configs : min_interval
                                     optional string
         ipv6_ra_configs : rdnss     optional string
         ipv6_ra_configs : dnssl     optional string
       Options:
         options : mcast_flood       optional string, either true or
                                     false
         options : requested-tnl-key
                                     optional string, containing an
                                     integer, in range 1 to 32,767
         options : prefix_delegation
                                     optional string, either true or
                                     false
         options : prefix            optional string, either true or
                                     false
         options : route_table       optional string
         options : gateway_mtu       optional string, containing an
                                     integer, in range 68 to 65,535
         options : gateway_mtu_bypass
                                     optional string
       Attachment:
         peer                        optional string
       Common Columns:
         external_ids                map of string-string pairs
       Status:
         status : hosting-chassis    optional string

   Details:
       name: string (must be unique within table)
              A name for the logical router port.

              In addition to provide convenience for human interaction
              with the northbound database, this column is used as
              reference by its patch port in Logical_Switch_Port or
              another logical router port in Logical_Router_Port.

              A logical router port may not have the same name as a
              logical switch port, but the database schema cannot
              enforce this.

       networks: set of 1 or more strings
              The IP addresses and netmasks of the router. For example,
              192.168.0.1/24 indicates that the router’s IP address is
              192.168.0.1 and that packets destined to 192.168.0.x
              should be routed to this port.

              A logical router port always adds a link-local IPv6
              address (fe80::/64) automatically generated from the
              interface’s MAC address using the modified EUI-64 format.

       mac: string
              The Ethernet address that belongs to this router port.

       enabled: optional boolean
              This column is used to administratively set port state. If
              this column is empty or is set to true, the port is
              enabled. If this column is set to false, the port is
              disabled. A disabled port has all ingress and egress
              traffic dropped.

       dhcp_relay: optional DHCP_Relay
              This column is used to enabled DHCP Relay. Please refer to
              DHCP_Relay table.

     Distributed Gateway Ports:

       Gateways, as documented under Gateways in the OVN architecture
       guide, provide limited connectivity between logical networks and
       physical ones. OVN support multiple kinds of gateways. The
       Logical_Router_Port table can be used two different ways to
       configure distributed gateway ports, which are one kind of
       gateway. These two forms of configuration exist for historical
       reasons. Both of them produce the same kind of OVN southbound
       records and the same behavior in practice.

       If either of these are set, this logical router port represents a
       distributed gateway port that connects this router to a logical
       switch with a localnet port or a connection to another OVN
       deployment.

       Also mentioned in the OVN architecture guide, distributed gateway
       ports can also be used for scalability reasons in deployments
       where logical switches are dedicated to chassises rather than
       distributed.

       The preferred way to configure a gateway is ha_chassis_group, but
       gateway_chassis is also supported for backward compatibility.
       Only one of these should be set at a time on a given LRP, since
       they configure the same features.

       Even when a gateway is configured, the logical router port still
       effectively resides on each chassis. However, due to the
       implications of the use of L2 learning in the physical network,
       as well as the need to support advanced features such as one-to-
       many NAT (aka IP masquerading), a subset of the logical router
       processing is handled in a centralized manner on the gateway
       chassis.

       There can be more than one distributed gateway ports configured
       on each logical router, each connecting to different L2 segments.
       Load-balancing is not yet supported on logical routers with more
       than one distributed gateway ports.

       For each distributed gateway port, it may have more than one
       gateway chassises. When more than one gateway chassis is
       specified, OVN only uses one at a time. OVN can rely on OVS BFD
       implementation to monitor gateway connectivity, preferring the
       highest-priority gateway that is online. Priorities are specified
       in the priority column of Gateway_Chassis or HA_Chassis.

       ovn-northd programs the external_mac rules specified in the LRP’s
       LR into the peer logical switch’s destination lookup on the
       chassis where the logical_port resides. In addition, the logical
       router’s MAC address is automatically programmed in the peer
       logical switch’s destination lookup flow on the gateway chasssis.
       If it is desired to generate gratuitous ARPs for NAT addresses,
       then set the peer LSP’s options:nat-addresses to router.

       OVN 20.03 and earlier supported a third way to configure
       distributed gateway ports using options:redirect-chassis to
       specify the gateway chassis. This method is no longer supported.
       Any remaining users should switch to one of the newer methods
       instead. A gateway_chassis may be easily configured from the
       command line, e.g. ovn-nbctl lrp-set-gateway-chassis lrp chassis.

       ha_chassis_group: optional HA_Chassis_Group
              Designates an HA_Chassis_Group to provide gateway high
              availability.

       gateway_chassis: set of Gateway_Chassises
              Designates one or more Gateway_Chassis for the logical
              router port.

     Options for Physical VLAN MTU Issues:

       MTU issues arise in mixing tunnels with logical networks that are
       bridged to a physical VLAN. For an explanation of the MTU issues,
       see Physical VLAN MTU Issues in the OVN architecture document.
       The following options, which are alternatives, provide solutions.
       Both of them cause packets to be sent over localnet instead of
       tunnels, but they differ in whether some or all packets are sent
       this way. The most prominent tradeoff between these options is
       that reside-on-redirect-chassis is easier to configure and that
       redirect-type performs better for east-west traffic.

       options : reside-on-redirect-chassis: optional string, either
       true or false
              If set to true, this option forces all traffic across the
              logical router port to pass through the gateway chassis
              using a hop across a localnet port. This changes behavior
              in two ways:

              •      Without this option, east-west traffic passes
                     directly between source and destination chassis (or
                     even within a single chassis, for co-located VMs).
                     With this option, all east-west traffic passes
                     through the gateway chassis.

              •      Without this option, traffic between the gateway
                     chassis and other chassis is encapsulated in
                     tunnels. With this option, traffic passes over a
                     localnet interface.

              This option may usefully be set only on logical router
              ports that connect a distributed logical router to a
              logical switch with VIFs. It should not be set on a
              distributed gateway port.

              OVN honors this option only if the logical router has one
              and only one distributed gateway port and if the LRP’s
              peer switch has a localnet port.

       options : redirect-type: optional string, either bridged or
       overlay
              If set to bridged on a distributed gateway port, this
              option causes OVN to redirect packets to the gateway
              chassis over a localnet port instead of a tunnel. The
              relevant chassis must share a localnet port.

              This feature requires the administrator or the CMS to
              configure each participating chassis with a unique
              Ethernet address for the logical router by setting
              ovn-chassis-mac-mappings in the Open vSwitch database, for
              use by ovn-controller.

              Setting this option to overlay or leaving it unset has no
              effect. This option may usefully be set only on a
              distributed gateway port when there is one and only one
              distributed gateway port on the logical router. It is
              otherwise ignored.

       ipv6_prefix: set of strings
              This column contains IPv6 prefix obtained by prefix
              delegation router according to RFC 3633

     ipv6_ra_configs:

       This column defines the IPv6 ND RA address mode and ND MTU Option
       to be included by ovn-controller when it replies to the IPv6
       Router solicitation requests.

       ipv6_ra_configs : address_mode: optional string
              The address mode to be used for IPv6 address
              configuration. The supported values are:

              •      slaac: Address configuration using Router
                     Advertisement (RA) packet. The IPv6 prefixes
                     defined in the Logical_Router_Port table’s networks
                     column will be included in the RA’s ICMPv6 option -
                     Prefix information.

              •      dhcpv6_stateful: Address configuration using
                     DHCPv6.

              •      dhcpv6_stateless: Address configuration using
                     Router Advertisement (RA) packet. Other IPv6
                     options are provided by DHCPv6.

       ipv6_ra_configs : router_preference: optional string
              Default Router Preference (PRF) indicates whether to
              prefer this router over other default routers (RFC 4191).
              Possible values are:

              •      HIGH: mapped to 0x01 in RA PRF field

              •      MEDIUM: mapped to 0x00 in RA PRF field

              •      LOW: mapped to 0x11 in RA PRF field

       ipv6_ra_configs : route_info: optional string
              Route Info is used to configure Route Info Option sent in
              Router Advertisement according to RFC 4191. Route Info is
              a comma separated string where each field provides PRF and
              prefix for a given route (e.g: HIGH-aef1::11/48,LOW-
              aef2::11/96) Possible PRF values are:

              •      HIGH: mapped to 0x01 in RA PRF field

              •      MEDIUM: mapped to 0x00 in RA PRF field

              •      LOW: mapped to 0x11 in RA PRF field

       ipv6_ra_configs : mtu: optional string
              The recommended MTU for the link. Default is 0, which
              means no MTU Option will be included in RA packet replied
              by ovn-controller. Per RFC 2460, the mtu value is
              recommended no less than 1280, so any mtu value less than
              1280 will be considered as no MTU Option.

       ipv6_ra_configs : send_periodic: optional string
              If set to true, then this router interface will send
              router advertisements periodically. The default is false.

       ipv6_ra_configs : max_interval: optional string
              The maximum number of seconds to wait between sending
              periodic router advertisements. This option has no effect
              if ipv6_ra_configs:send_periodic is false. The default is
              600.

       ipv6_ra_configs : min_interval: optional string
              The minimum number of seconds to wait between sending
              periodic router advertisements. This option has no effect
              if ipv6_ra_configs:send_periodic is false. The default is
              one-third of ipv6_ra_configs:max_interval, i.e. 200
              seconds if that key is unset.

       ipv6_ra_configs : rdnss: optional string
              IPv6 address of RDNSS server announced in RA packets. At
              the moment OVN supports just one RDNSS server.

       ipv6_ra_configs : dnssl: optional string
              DNS Search List announced in RA packets. Multiple DNS
              Search List must be ’comma’ separated (e.g. "a.b.c,
              d.e.f")

     Options:

       Additional options for the logical router port.

       options : mcast_flood: optional string, either true or false
              If set to true, multicast traffic (including reports) are
              unconditionally forwarded to the specific port.

              This option applies when the port is part of a logical
              router which has options:mcast_relay set to true.

              Default: false.

       options : requested-tnl-key: optional string, containing an
       integer, in range 1 to 32,767
              Configures the port binding tunnel key for the port.
              Usually this is not needed because ovn-northd will assign
              an unique key for each port by itself. However, if it is
              configured, ovn-northd honors the configured value.

       options : prefix_delegation: optional string, either true or
       false
              If set to true, enable IPv6 prefix delegation state
              machine on this logical router port (RFC3633). IPv6 prefix
              delegation is available just on a gateway router or on a
              gateway router port.

       options : prefix: optional string, either true or false
              If set to true, this interface will receive an IPv6 prefix
              according to RFC3663

       options : route_table: optional string
              Designates lookup Logical_Router_Static_Routes with
              specified route_table value. Routes to directly connected
              networks from same Logical Router and routes without
              route_table option set have higher priority than routes
              with route_table option set.

       options : gateway_mtu: optional string, containing an integer, in
       range 68 to 65,535
              If set, logical flows will be added to router pipeline to
              check packet length. If packet length is greater than the
              value set, ICMPv4 type 3 (Destination Unreachable) code 4
              (Fragmentation Needed and Don’t Fragment was Set) or
              ICMPv6 type 2 (Packet Too Big) code 0 (no route to
              destination) packets will be generated. This allows for
              Path MTU Discovery.

       options : gateway_mtu_bypass: optional string
              When configured, represents a match expression, in the
              same expression language used for the match column in the
              OVN Southbound database’s Logical_Flow table. Packets
              matching this expression will bypass the length check
              configured through the options:gateway_mtu option.

     Attachment:

       A given router port serves one of two purposes:

              •      To attach a logical switch to a logical router. A
                     logical router port of this type is referenced by
                     exactly one Logical_Switch_Port of type router. The
                     value of name is set as router-port in column
                     options of Logical_Switch_Port. In this case peer
                     column is empty.

              •      To connect one logical router to another. This
                     requires a pair of logical router ports, each
                     connected to a different router. Each router port
                     in the pair specifies the other in its peer column.
                     No Logical_Switch refers to the router port.

       peer: optional string
              For a router port used to connect two logical routers,
              this identifies the other router port in the pair by name.

              For a router port attached to a logical switch, this
              column is empty.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

              The ovn-northd program copies all these pairs into the
              external_ids column of the Port_Binding table in
              OVN_Southbound database.

     Status:

       Additional status about the logical router port.

       status : hosting-chassis: optional string
              This option is populated by ovn-northd.

              When a distributed gateway port is bound to a location in
              the OVN Southbound database Port_Binding ovn-northd will
              populate this key with the name of the Chassis that is
              currently hosting this port.

Logical_Router_Static_Route TABLE         top

       Each record represents a static route.

       When multiple routes match a packet, the longest-prefix match is
       chosen. For a given prefix length, a dst-ip route is preferred
       over a src-ip route.

       When there are ECMP routes, i.e. multiple routes with same prefix
       and policy, one of them will be selected based on the 5-tuple
       hashing of the packet header.

   Summary:
       ip_prefix                     string
       policy                        optional string, either dst-ip or
                                     src-ip
       nexthop                       string
       output_port                   optional string
       bfd                           optional weak reference to BFD
       route_table                   string
       external_ids : ic-learned-route
                                     optional string
       Common Columns:
         external_ids                map of string-string pairs
       Common options:
         options                     map of string-string pairs
         options : ecmp_symmetric_reply
                                     optional string
         options : origin            optional string

   Details:
       ip_prefix: string
              IP prefix of this route (e.g. 192.168.100.0/24).

       policy: optional string, either dst-ip or src-ip
              If it is specified, this setting describes the policy used
              to make routing decisions. This setting must be one of the
              following strings:

              •      src-ip: This policy sends the packet to the nexthop
                     when the packet’s source IP address matches
                     ip_prefix.

              •      dst-ip: This policy sends the packet to the nexthop
                     when the packet’s destination IP address matches
                     ip_prefix.

              If not specified, the default is dst-ip.

       nexthop: string
              Nexthop IP address for this route. Nexthop IP address
              should be the IP address of a connected router port or the
              IP address of a logical port or can be set to discard for
              dropping packets which match the given route.

       output_port: optional string
              The name of the Logical_Router_Port via which the packet
              needs to be sent out. This is optional and when not
              specified, OVN will automatically figure this out based on
              the nexthop. When this is specified and there are multiple
              IP addresses on the router port and none of them are in
              the same subnet of nexthop, OVN chooses the first IP
              address as the one via which the nexthop is reachable.

       bfd: optional weak reference to BFD
              Reference to BFD row if the route has associated a BFD
              session

       route_table: string
              Any string to place route to separate routing table. If
              Logical Router Port has configured value in
              options:route_table other than empty string, OVN performs
              route lookup for all packets entering Logical Router
              ingress pipeline from this port in the following manner:

              •      1. First lookup among "global" routes: routes
                     without route_table value set and routes to
                     directly connected networks.

              •      2. Next lookup among routes with same route_table
                     value as specified in LRP’s options:route_table
                     field.

       external_ids : ic-learned-route: optional string
              ovn-ic populates this key if the route is learned from the
              global OVN_IC_Southbound database. In this case the value
              will be set to the uuid of the row in Route table of the
              OVN_IC_Southbound database.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

     Common options:

       options: map of string-string pairs
              This column provides general key/value settings. The
              supported options are described individually below.

       options : ecmp_symmetric_reply: optional string
              If true, then new traffic that arrives over this route
              will have its reply traffic bypass ECMP route selection
              and will be sent out this route instead. Note that this
              option overrides any rules set in the
              Logical_Router_policy table. This option only works on
              gateway routers (routers that have options:chassis set).

       options : origin: optional string
              In case ovn-interconnection has been learned this route,
              it will have its origin set: either "connected" or
              "static". This key is supposed to be written only by
              ovn-ic daemon. ovn-northd then checks this value when
              generating Logical Flows. Logical_Router_Static_Route
              records with same ip_prefix within same Logical Router
              will have next lookup order based on origin key value:

              1.  connected

              2.  static

Logical_Router_Policy TABLE         top

       Each row in this table represents one routing policy for a
       logical router that points to it through its policies column. The
       action column for the highest-priority matching row in this table
       determines a packet’s treatment. If no row matches, packets are
       allowed by default. (Default-deny treatment is possible: add a
       rule with priority 0, 1 as match, and drop as action.)

   Summary:
       priority                      integer, in range 0 to 32,767
       match                         string
       action                        string, one of allow, drop, or
                                     reroute
       nexthop                       optional string
       nexthops                      set of strings
       bfd_sessions                  set of weak reference to BFDs
       options : pkt_mark            optional string
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       priority: integer, in range 0 to 32,767
              The routing policy’s priority. Rules with numerically
              higher priority take precedence over those with lower. A
              rule is uniquely identified by the priority and match
              string.

       match: string
              The packets that the routing policy should match, in the
              same expression language used for the match column in the
              OVN Southbound database’s Logical_Flow table.

              By default all traffic is allowed. When writing a more
              restrictive policy, it is important to remember to allow
              flows such as ARP and IPv6 neighbor discovery packets.

       action: string, one of allow, drop, or reroute
              The action to take when the routing policy matches:

              •      allow: Forward the packet.

              •      drop: Silently drop the packet.

              •      reroute: Reroute packet to nexthop or nexthops.

       nexthop: optional string
              Note: This column is deprecated in favor of nexthops.

              Next-hop IP address for this route, which should be the IP
              address of a connected router port or the IP address of a
              logical port.

       nexthops: set of strings
              Next-hop ECMP IP addresses for this route. Each IP in the
              list should be the IP address of a connected router port
              or the IP address of a logical port.

              One IP from the list is selected as next hop.

       bfd_sessions: set of weak reference to BFDs
              Reference to BFD row if the route policy has associated
              some BFD sessions.

       options : pkt_mark: optional string
              Marks the packet with the value specified when the router
              policy is applied. CMS can inspect this packet marker and
              take some decisions if desired. This value is not
              preserved when the packet goes out on the wire.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

NAT TABLE         top

       Each record represents a NAT rule.

   Summary:
       type                          string, one of dnat, dnat_and_snat,
                                     or snat
       external_ip                   string
       external_mac                  optional string
       external_port_range           string
       logical_ip                    string
       logical_port                  optional string
       allowed_ext_ips               optional Address_Set
       exempted_ext_ips              optional Address_Set
       gateway_port                  optional weak reference to
                                     Logical_Router_Port
       options : stateless           optional string
       options : add_route           optional string
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       type: string, one of dnat, dnat_and_snat, or snat
              Type of the NAT rule.

              •      When type is dnat, the externally visible IP
                     address external_ip is DNATted to the IP address
                     logical_ip in the logical space.

              •      When type is snat, IP packets with their source IP
                     address that either matches the IP address in
                     logical_ip or is in the network provided by
                     logical_ip is SNATed into the IP address in
                     external_ip.

              •      When type is dnat_and_snat, the externally visible
                     IP address external_ip is DNATted to the IP address
                     logical_ip in the logical space. In addition, IP
                     packets with the source IP address that matches
                     logical_ip is SNATed into the IP address in
                     external_ip.

       external_ip: string
              An IPv4 address.

       external_mac: optional string
              A MAC address.

              This is only used on the gateway port on distributed
              routers. This must be specified in order for the NAT rule
              to be processed in a distributed manner on all chassis. If
              this is not specified for a NAT rule on a distributed
              router, then this NAT rule will be processed in a
              centralized manner on the gateway port instance on the
              gateway chassis.

              This MAC address must be unique on the logical switch that
              the gateway port is attached to. If the MAC address used
              on the logical_port is globally unique, then that MAC
              address can be specified as this external_mac.

       external_port_range: string
              L4 source port range

              Range of ports, from which a port number will be picked
              that will replace the source port of to be NATed packet.
              This is basically PAT (port address translation).

              Value of the column is in the format, port_lo-port_hi. For
              example: external_port_range : "1-30000"

              Valid range of ports is 1-65535.

       logical_ip: string
              An IPv4 network (e.g 192.168.1.0/24) or an IPv4 address.

       logical_port: optional string
              The name of the logical port where the logical_ip resides.

              This is only used on distributed routers. This must be
              specified in order for the NAT rule to be processed in a
              distributed manner on all chassis. If this is not
              specified for a NAT rule on a distributed router, then
              this NAT rule will be processed in a centralized manner on
              the gateway port instance on the gateway chassis.

       allowed_ext_ips: optional Address_Set
              It represents Address Set of external ips that NAT rule is
              applicable to. For SNAT type NAT rules, this refers to
              destination addresses. For DNAT type NAT rules, this
              refers to source addresses.

              This configuration overrides the default NAT behavior of
              applying a rule solely based on internal IP. Without this
              configuration, NAT happens without considering the
              external IP (i.e dest/source for snat/dnat type rule).
              With this configuration NAT rule is applied ONLY if
              external ip is in the input Address Set.

       exempted_ext_ips: optional Address_Set
              It represents Address Set of external ips that NAT rule is
              NOT applicable to. For SNAT type NAT rules, this refers to
              destination addresses. For DNAT type NAT rules, this
              refers to source addresses.

              This configuration overrides the default NAT behavior of
              applying a rule solely based on internal IP. Without this
              configuration, NAT happens without considering the
              external IP (i.e dest/source for snat/dnat type rule).
              With this configuration NAT rule is NOT applied if
              external ip is in the input Address Set.

              If there are NAT rules in a logical router with
              overlapping IP prefixes (including /32), then usage of
              exempted_ext_ips should be avoided in following scenario.
              a. SNAT rule (let us say RULE1) with logical_ip
              PREFIX/MASK (let us say 50.0.0.0/24). b. SNAT rule (let us
              say RULE2) with logical_ip PREFIX/MASK+1 (let us say
              50.0.0.0/25). c. Now, if exempted_ext_ips is associated
              with RULE2, then a logical ip which matches both
              50.0.0.0/24 and 50.0.0.0/25 may get the RULE2 applied to
              it instead of RULE1.

              allowed_ext_ips and exempted_ext_ips are mutually
              exclusive to each other. If both Address Sets are set for
              a rule, then the NAT rule is not considered.

       gateway_port: optional weak reference to Logical_Router_Port
              A distributed gateway port in the Logical_Router_Port
              table where the NAT rule needs to be applied.

              When multiple distributed gateway ports are configured on
              a Logical_Router, applying a NAT rule at each of the
              distributed gateway ports might not be desired. Consider
              the case where a logical router has 2 distributed gateway
              port, one with networks 50.0.0.10/24 and the other with
              networks 60.0.0.10/24. If the logical router has a NAT
              rule of type snat, logical_ip 10.1.1.0/24 and external_ip
              50.1.1.20/24, the rule needs to be selectively applied on
              matching packets entering/leaving through the distributed
              gateway port with networks 50.0.0.10/24.

              When a logical router has multiple distributed gateway
              ports and this column is not set for a NAT rule, then the
              rule will be applied at the distributed gateway port which
              is in the same network as the external_ip of the NAT rule,
              if such a router port exists. If logical router has a
              single distributed gateway port and this column is not set
              for a NAT rule, the rule will be applied at the
              distributed gateway port even if the router port is not in
              the same network as the external_ip of the NAT rule.

       options : stateless: optional string
              Indicates if a dnat_and_snat rule should lead to
              connection tracking state or not.

       options : add_route: optional string
              If set to true, then neighbor routers will have logical
              flows added that will allow for routing to the NAT
              address. It also will have ARP resolution logical flows
              added. By setting this option, it means there is no reason
              to create a Logical_Router_Static_Route from neighbor
              routers to this NAT address. It also means that no ARP
              request is required for neighbor routers to learn the IP-
              MAC mapping for this NAT address. This option only applies
              to NATs of type dnat and dnat_and_snat. For more
              information about what flows are added for IP routes,
              please see the ovn-northd manpage section on IP Routing.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

DHCP_Options TABLE         top

       OVN implements native DHCPv4 support which caters to the common
       use case of providing an IPv4 address to a booting instance by
       providing stateless replies to DHCPv4 requests based on
       statically configured address mappings. To do this it allows a
       short list of DHCPv4 options to be configured and applied at each
       compute host running ovn-controller.

       OVN also implements native DHCPv6 support which provides
       stateless replies to DHCPv6 requests.

   Summary:
       cidr                          string
       DHCPv4 options:
         Mandatory DHCPv4 options:
            options : server_id      optional string
            options : server_mac     optional string
            options : lease_time     optional string, containing an
                                     integer, in range 0 to
                                     4,294,967,295
         IPv4 DHCP Options:
            options : router         optional string
            options : netmask        optional string
            options : dns_server     optional string
            options : log_server     optional string
            options : lpr_server     optional string
            options : swap_server    optional string
            options : policy_filter  optional string
            options : router_solicitation
                                     optional string
            options : nis_server     optional string
            options : ntp_server     optional string
            options : netbios_name_server
                                     optional string
            options : classless_static_route
                                     optional string
            options : ms_classless_static_route
                                     optional string
            options : next_server    optional string
         Boolean DHCP Options:
            options : ip_forward_enable
                                     optional string, either 0 or 1
            options : router_discovery
                                     optional string, either 0 or 1
            options : ethernet_encap optional string, either 0 or 1
         Integer DHCP Options:
            options : default_ttl    optional string, containing an
                                     integer, in range 0 to 255
            options : tcp_ttl        optional string, containing an
                                     integer, in range 0 to 255
            options : mtu            optional string, containing an
                                     integer, in range 68 to 65,535
            options : T1             optional string, containing an
                                     integer, in range 68 to
                                     4,294,967,295
            options : T2             optional string, containing an
                                     integer, in range 68 to
                                     4,294,967,295
            options : arp_cache_timeout
                                     optional string, containing an
                                     integer, in range 0 to 255
            options : tcp_keepalive_interval
                                     optional string, containing an
                                     integer, in range 0 to 255
            options : netbios_node_type
                                     optional string, containing an
                                     integer, in range 0 to 255
         String DHCP Options:
            options : wpad           optional string
            options : bootfile_name  optional string
            options : path_prefix    optional string
            options : tftp_server_address
                                     optional string
            options : hostname       optional string
            options : domain_name    optional string
            options : bootfile_name_alt
                                     optional string
            options : broadcast_address
                                     optional string
         DHCP Options of type host_id:
            options : tftp_server    optional string
          DHCP Options of type domains:
            options : domain_search_list
                                     optional string
       DHCPv6 options:
         Mandatory DHCPv6 options:
            options : server_id      optional string
         IPv6 DHCPv6 options:
            options : dns_server     optional string
         String DHCPv6 options:
            options : domain_search  optional string
            options : dhcpv6_stateless
                                     optional string
            options : fqdn           optional string
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       cidr: string
              The DHCPv4/DHCPv6 options will be included if the logical
              port has its IP address in this cidr.

     DHCPv4 options:

       The CMS should define the set of DHCPv4 options as key/value
       pairs in the options column of this table. For ovn-controller to
       include these DHCPv4 options, the dhcpv4_options of
       Logical_Switch_Port should refer to an entry in this table.

     Mandatory DHCPv4 options:

       The following options must be defined.

       options : server_id: optional string
              The IP address for the DHCP server to use. This should be
              in the subnet of the offered IP. This is also included in
              the DHCP offer as option 54, ``server identifier.’’

       options : server_mac: optional string
              The Ethernet address for the DHCP server to use.

       options : lease_time: optional string, containing an integer, in
       range 0 to 4,294,967,295
              The offered lease time in seconds,

              The DHCPv4 option code for this option is 51.

     IPv4 DHCP Options:

       Below are the supported DHCPv4 options whose values are an IPv4
       address, e.g. 192.168.1.1. Some options accept multiple IPv4
       addresses enclosed within curly braces, e.g. {192.168.1.2,
       192.168.1.3}. Please refer to RFC 2132 for more details on DHCPv4
       options and their codes.

       options : router: optional string
              The IP address of a gateway for the client to use. This
              should be in the subnet of the offered IP. The DHCPv4
              option code for this option is 3.

       options : netmask: optional string
              The DHCPv4 option code for this option is 1.

       options : dns_server: optional string
              The DHCPv4 option code for this option is 6.

       options : log_server: optional string
              The DHCPv4 option code for this option is 7.

       options : lpr_server: optional string
              The DHCPv4 option code for this option is 9.

       options : swap_server: optional string
              The DHCPv4 option code for this option is 16.

       options : policy_filter: optional string
              The DHCPv4 option code for this option is 21.

       options : router_solicitation: optional string
              The DHCPv4 option code for this option is 32.

       options : nis_server: optional string
              The DHCPv4 option code for this option is 41.

       options : ntp_server: optional string
              The DHCPv4 option code for this option is 42.

       options : netbios_name_server: optional string
              The DHCPv4 option code for this option is 44.

       options : classless_static_route: optional string
              The DHCPv4 option code for this option is 121.

              This option can contain one or more static routes, each of
              which consists of a destination descriptor and the IP
              address of the router that should be used to reach that
              destination. Please see RFC 3442 for more details.

              Example: {30.0.0.0/24,10.0.0.10, 0.0.0.0/0,10.0.0.1}

       options : ms_classless_static_route: optional string
              The DHCPv4 option code for this option is 249. This option
              is similar to classless_static_route supported by
              Microsoft Windows DHCPv4 clients.

       options : next_server: optional string
              The DHCPv4 option code for setting the "Next server IP
              address" field in the DHCP header.

     Boolean DHCP Options:

       These options accept a Boolean value, expressed as 0 for false or
       1 for true.

       options : ip_forward_enable: optional string, either 0 or 1
              The DHCPv4 option code for this option is 19.

       options : router_discovery: optional string, either 0 or 1
              The DHCPv4 option code for this option is 31.

       options : ethernet_encap: optional string, either 0 or 1
              The DHCPv4 option code for this option is 36.

     Integer DHCP Options:

       These options accept a nonnegative integer value.

       options : default_ttl: optional string, containing an integer, in
       range 0 to 255
              The DHCPv4 option code for this option is 23.

       options : tcp_ttl: optional string, containing an integer, in
       range 0 to 255
              The DHCPv4 option code for this option is 37.

       options : mtu: optional string, containing an integer, in range
       68 to 65,535
              The DHCPv4 option code for this option is 26.

       options : T1: optional string, containing an integer, in range 68
       to 4,294,967,295
              This specifies the time interval from address assignment
              until the client begins trying to renew its address. The
              DHCPv4 option code for this option is 58.

       options : T2: optional string, containing an integer, in range 68
       to 4,294,967,295
              This specifies the time interval from address assignment
              until the client begins trying to rebind its address. The
              DHCPv4 option code for this option is 59.

       options : arp_cache_timeout: optional string, containing an
       integer, in range 0 to 255
              The DHCPv4 option code for this option is 35. This option
              specifies the timeout in seconds for ARP cache entries.

       options : tcp_keepalive_interval: optional string, containing an
       integer, in range 0 to 255
              The DHCPv4 option code for this option is 38. This option
              specifies the interval that the client TCP should wait
              before sending a keepalive message on a TCP connection.

       options : netbios_node_type: optional string, containing an
       integer, in range 0 to 255
              The DHCPv4 option code for this option is 46.

     String DHCP Options:

       These options accept a string value.

       options : wpad: optional string
              The DHCPv4 option code for this option is 252. This option
              is used as part of web proxy auto discovery to provide a
              URL for a web proxy.

       options : bootfile_name: optional string
              The DHCPv4 option code for this option is 67. This option
              is used to identify a bootfile.

       options : path_prefix: optional string
              The DHCPv4 option code for this option is 210. In
              PXELINUX’ case this option is used to set a common path
              prefix, instead of deriving it from the bootfile name.

       options : tftp_server_address: optional string
              The DHCPv4 option code for this option is 150. The option
              contains one or more IPv4 addresses that the client MAY
              use. This option is Cisco proprietary, the IEEE standard
              that matches with this requirement is option 66
              (tftp_server).

       options : hostname: optional string
              The DHCPv4 option code for this option is 12. If set,
              indicates the DHCPv4 option "Hostname". Alternatively,
              this option can be configured in options:hostname column
              in table Logical_Switch_Port. If Hostname option value is
              set in both conflicting Logical_Switch_Port and
              DHCP_Options tables, Logical_Switch_Port takes precedence.

       options : domain_name: optional string
              The DHCPv4 option code for this option is 15. This option
              specifies the domain name that client should use when
              resolving hostnames via the Domain Name System.

       options : bootfile_name_alt: optional string
              "bootfile_name_alt" option is used to support iPXE. When
              both "bootfile_name" and "bootfile_name_alt" are provided
              by the CMS, "bootfile_name" will be used for option 67 if
              the dhcp request contains etherboot option (175),
              otherwise "bootfile_name_alt" will be used.

       options : broadcast_address: optional string
              The DHCPv4 option code for this option is 28. This option
              specifies the IP address used as a broadcast address.

     DHCP Options of type host_id:

       These options accept either an IPv4 address or a string value.

       options : tftp_server: optional string
              The DHCPv4 option code for this option is 66.

      DHCP Options of type domains:

       These options accept string value which is a comma separated list
       of domain names. The domain names are encoded based on RFC 1035.

       options : domain_search_list: optional string
              The DHCPv4 option code for this option is 119.

     DHCPv6 options:

       OVN also implements native DHCPv6 support. The CMS should define
       the set of DHCPv6 options as key/value pairs. The define DHCPv6
       options will be included in the DHCPv6 response to the DHCPv6
       Solicit/Request/Confirm packet from the logical ports having the
       IPv6 addresses in the cidr.

     Mandatory DHCPv6 options:

       The following options must be defined.

       options : server_id: optional string
              The Ethernet address for the DHCP server to use. This is
              also included in the DHCPv6 reply as option 2, ``Server
              Identifier’’ to carry a DUID identifying a server between
              a client and a server. ovn-controller defines DUID based
              on Link-layer Address [DUID-LL].

     IPv6 DHCPv6 options:

       Below are the supported DHCPv6 options whose values are an IPv6
       address, e.g. aef0::4. Some options accept multiple IPv6
       addresses enclosed within curly braces, e.g. {aef0::4, aef0::5}.
       Please refer to RFC 3315 for more details on DHCPv6 options and
       their codes.

       options : dns_server: optional string
              The DHCPv6 option code for this option is 23. This option
              specifies the DNS servers that the VM should use.

     String DHCPv6 options:

       These options accept string values.

       options : domain_search: optional string
              The DHCPv6 option code for this option is 24. This option
              specifies the domain search list the client should use to
              resolve hostnames with DNS.

              Example: "ovn.org".

       options : dhcpv6_stateless: optional string
              This option specifies the OVN native DHCPv6 will work in
              stateless mode, which means OVN native DHCPv6 will not
              offer IPv6 addresses for VM/VIF ports, but only reply
              other configurations, such as DNS and domain search list.
              When setting this option with string value "true", VM/VIF
              will configure IPv6 addresses by stateless way. Default
              value for this option is false.

       options : fqdn: optional string
              The DHCPv6 option code for this option is 39. If set,
              indicates the DHCPv6 option "FQDN".

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

DHCP_Relay TABLE         top

       OVN implements native DHCPv4 relay support which caters to the
       common use case of relaying the DHCP requests to external DHCP
       server.

   Summary:
       name                          string
       servers                       optional string
       options                       map of string-string pairs
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       name: string
              A name for the DHCP Relay.

       servers: optional string
              The DHCPv4 server IP address.

       options: map of string-string pairs
              Future purpose.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

Connection TABLE         top

       Configuration for a database connection to an Open vSwitch
       database (OVSDB) client.

       This table primarily configures the Open vSwitch database server
       (ovsdb-server).

       The Open vSwitch database server can initiate and maintain active
       connections to remote clients. It can also listen for database
       connections.

   Summary:
       Core Features:
         target                      string (must be unique within
                                     table)
       Client Failure Detection and Handling:
         max_backoff                 optional integer, at least 1,000
         inactivity_probe            optional integer
       Status:
         is_connected                boolean
         status : last_error         optional string
         status : state              optional string, one of ACTIVE,
                                     BACKOFF, CONNECTING, IDLE, or VOID
         status : sec_since_connect  optional string, containing an
                                     integer, at least 0
         status : sec_since_disconnect
                                     optional string, containing an
                                     integer, at least 0
         status : locks_held         optional string
         status : locks_waiting      optional string
         status : locks_lost         optional string
         status : n_connections      optional string, containing an
                                     integer, at least 2
         status : bound_port         optional string, containing an
                                     integer
       Common Columns:
         external_ids                map of string-string pairs
         other_config                map of string-string pairs

   Details:
     Core Features:

       target: string (must be unique within table)
              Connection methods for clients.

              The following connection methods are currently supported:

              ssl:host[:port]
                     The specified SSL port on the host at the given
                     host, which can either be a DNS name (if built with
                     unbound library) or an IP address. A valid SSL
                     configuration must be provided when this form is
                     used, this configuration can be specified via
                     command-line options or the SSL table.

                     If port is not specified, it defaults to 6640.

                     SSL support is an optional feature that is not
                     always built as part of Open vSwitch.

              tcp:host[:port]
                     The specified TCP port on the host at the given
                     host, which can either be a DNS name (if built with
                     unbound library) or an IP address. If host is an
                     IPv6 address, wrap it in square brackets, e.g.
                     tcp:[::1]:6640.

                     If port is not specified, it defaults to 6640.

              pssl:[port][:host]
                     Listens for SSL connections on the specified TCP
                     port. Specify 0 for port to have the kernel
                     automatically choose an available port. If host,
                     which can either be a DNS name (if built with
                     unbound library) or an IP address, is specified,
                     then connections are restricted to the resolved or
                     specified local IPaddress (either IPv4 or IPv6
                     address). If host is an IPv6 address, wrap in
                     square brackets, e.g. pssl:6640:[::1]. If host is
                     not specified then it listens only on IPv4 (but not
                     IPv6) addresses. A valid SSL configuration must be
                     provided when this form is used, this can be
                     specified either via command-line options or the
                     SSL table.

                     If port is not specified, it defaults to 6640.

                     SSL support is an optional feature that is not
                     always built as part of Open vSwitch.

              ptcp:[port][:host]
                     Listens for connections on the specified TCP port.
                     Specify 0 for port to have the kernel automatically
                     choose an available port. If host, which can either
                     be a DNS name (if built with unbound library) or an
                     IP address, is specified, then connections are
                     restricted to the resolved or specified local IP
                     address (either IPv4 or IPv6 address). If host is
                     an IPv6 address, wrap it in square brackets, e.g.
                     ptcp:6640:[::1]. If host is not specified then it
                     listens only on IPv4 addresses.

                     If port is not specified, it defaults to 6640.

              When multiple clients are configured, the target values
              must be unique. Duplicate target values yield unspecified
              results.

     Client Failure Detection and Handling:

       max_backoff: optional integer, at least 1,000
              Maximum number of milliseconds to wait between connection
              attempts. Default is implementation-specific.

       inactivity_probe: optional integer
              Maximum number of milliseconds of idle time on connection
              to the client before sending an inactivity probe message.
              If Open vSwitch does not communicate with the client for
              the specified number of seconds, it will send a probe. If
              a response is not received for the same additional amount
              of time, Open vSwitch assumes the connection has been
              broken and attempts to reconnect. Default is
              implementation-specific. A value of 0 disables inactivity
              probes.

     Status:

       Key-value pair of is_connected is always updated. Other key-value
       pairs in the status columns may be updated depends on the target
       type.

       When target specifies a connection method that listens for
       inbound connections (e.g. ptcp: or punix:), both n_connections
       and is_connected may also be updated while the remaining key-
       value pairs are omitted.

       On the other hand, when target specifies an outbound connection,
       all key-value pairs may be updated, except the above-mentioned
       two key-value pairs associated with inbound connection targets.
       They are omitted.

       is_connected: boolean
              true if currently connected to this client, false
              otherwise.

       status : last_error: optional string
              A human-readable description of the last error on the
              connection to the manager; i.e. strerror(errno). This key
              will exist only if an error has occurred.

       status : state: optional string, one of ACTIVE, BACKOFF,
       CONNECTING, IDLE, or VOID
              The state of the connection to the manager:

              VOID   Connection is disabled.

              BACKOFF
                     Attempting to reconnect at an increasing period.

              CONNECTING
                     Attempting to connect.

              ACTIVE Connected, remote host responsive.

              IDLE   Connection is idle. Waiting for response to keep-
                     alive.

              These values may change in the future. They are provided
              only for human consumption.

       status : sec_since_connect: optional string, containing an
       integer, at least 0
              The amount of time since this client last successfully
              connected to the database (in seconds). Value is empty if
              client has never successfully been connected.

       status : sec_since_disconnect: optional string, containing an
       integer, at least 0
              The amount of time since this client last disconnected
              from the database (in seconds). Value is empty if client
              has never disconnected.

       status : locks_held: optional string
              Space-separated list of the names of OVSDB locks that the
              connection holds. Omitted if the connection does not hold
              any locks.

       status : locks_waiting: optional string
              Space-separated list of the names of OVSDB locks that the
              connection is currently waiting to acquire. Omitted if the
              connection is not waiting for any locks.

       status : locks_lost: optional string
              Space-separated list of the names of OVSDB locks that the
              connection has had stolen by another OVSDB client. Omitted
              if no locks have been stolen from this connection.

       status : n_connections: optional string, containing an integer,
       at least 2
              When target specifies a connection method that listens for
              inbound connections (e.g. ptcp: or pssl:) and more than
              one connection is actually active, the value is the number
              of active connections. Otherwise, this key-value pair is
              omitted.

       status : bound_port: optional string, containing an integer
              When target is ptcp: or pssl:, this is the TCP port on
              which the OVSDB server is listening. (This is particularly
              useful when target specifies a port of 0, allowing the
              kernel to choose any available port.)

     Common Columns:

       The overall purpose of these columns is described under Common
       Columns at the beginning of this document.

       external_ids: map of string-string pairs

       other_config: map of string-string pairs

DNS TABLE         top

       Each row in this table stores the DNS records. The Logical_Switch
       table’s dns_records references these records.

   Summary:
       records                       map of string-string pairs
       options : ovn-owned           optional string
       external_ids                  map of string-string pairs

   Details:
       records: map of string-string pairs
              Key-value pair of DNS records with DNS query name as the
              key and value as a string of IP address(es) separated by
              comma or space. For PTR requests, the key-value pair can
              be Reverse IPv4 address.in-addr.arpa and the value DNS
              domain name. For IPv6 addresses, the key has to be Reverse
              IPv6 address.ip6.arpa.

              Example:  "vm1.ovn.org" = "10.0.0.4 aef0::4"

              Example:  "4.0.0.10.in-addr.arpa" = "vm1.ovn.org"

       options : ovn-owned: optional string
              If set to true, then the OVN will be the main responsible
              for DNS Records within this row.

              A DNS row with this option set to true can be created for
              domains that the user needs to configure locally and don’t
              care about IPv6 only interested in IPv4 or vice versa.
              This will let ovn send IPv4 DNS reply and reject/ignore
              IPv6 queries to save the waiting for a timeout on those
              uninteresting queries.

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

SSL TABLE         top

       SSL configuration for ovn-nb database access.

   Summary:
       private_key                   string
       certificate                   string
       ca_cert                       string
       bootstrap_ca_cert             boolean
       ssl_protocols                 string
       ssl_ciphers                   string
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       private_key: string
              Name of a PEM file containing the private key used as the
              switch’s identity for SSL connections to the controller.

       certificate: string
              Name of a PEM file containing a certificate, signed by the
              certificate authority (CA) used by the controller and
              manager, that certifies the switch’s private key,
              identifying a trustworthy switch.

       ca_cert: string
              Name of a PEM file containing the CA certificate used to
              verify that the switch is connected to a trustworthy
              controller.

       bootstrap_ca_cert: boolean
              If set to true, then Open vSwitch will attempt to obtain
              the CA certificate from the controller on its first SSL
              connection and save it to the named PEM file. If it is
              successful, it will immediately drop the connection and
              reconnect, and from then on all SSL connections must be
              authenticated by a certificate signed by the CA
              certificate thus obtained. This option exposes the SSL
              connection to a man-in-the-middle attack obtaining the
              initial CA certificate. It may still be useful for
              bootstrapping.

       ssl_protocols: string
              List of SSL protocols to be enabled for SSL connections.
              The default when this option is omitted is
              TLSv1,TLSv1.1,TLSv1.2.

       ssl_ciphers: string
              List of ciphers (in OpenSSL cipher string format) to be
              supported for SSL connections. The default when this
              option is omitted is HIGH:!aNULL:!MD5.

     Common Columns:

       The overall purpose of these columns is described under Common
       Columns at the beginning of this document.

       external_ids: map of string-string pairs

Gateway_Chassis TABLE         top

       Association of a chassis to a logical router port. The traffic
       going out through an specific router port will be redirected to a
       chassis, or a set of them in high availability configurations.

   Summary:
       name                          string (must be unique within
                                     table)
       chassis_name                  string
       priority                      integer, in range 0 to 32,767
       options                       map of string-string pairs
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       name: string (must be unique within table)
              Name of the Gateway_Chassis.

              A suggested, but not required naming convention is
              ${port_name}_${chassis_name}.

       chassis_name: string
              Name of the chassis that we want to redirect traffic
              through for the associated logical router port. The value
              must match the name column of the Chassis table in the
              OVN_Southbound database.

       priority: integer, in range 0 to 32,767
              This is the priority of a chassis among all
              Gateway_Chassis belonging to the same logical router port.

       options: map of string-string pairs
              Reserved for future use.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

HA_Chassis_Group TABLE         top

       Table representing a group of chassis which can provide high
       availability services. Each chassis in the group is represented
       by the table HA_Chassis. The HA chassis with highest priority
       will be the active chassis of this group. If the active chassis
       failover is detected, the HA chassis with the next higher
       priority takes over the responsibility of providing the HA. If a
       distributed gateway router port references a row in this table,
       then the active HA chassis in this group provides the gateway
       functionality.

   Summary:
       name                          string (must be unique within
                                     table)
       ha_chassis                    set of HA_Chassises
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       name: string (must be unique within table)
              Name of the HA_Chassis_Group. Name should be unique.

       ha_chassis: set of HA_Chassises
              A list of HA chassis which belongs to this group.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

HA_Chassis TABLE         top

   Summary:
       chassis_name                  string
       priority                      integer, in range 0 to 32,767
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       chassis_name: string
              Name of the chassis which is part of the HA chassis group.
              The value must match the name column of the Chassis table
              in the OVN_Southbound database.

       priority: integer, in range 0 to 32,767
              Priority of the chassis. Chassis with highest priority
              will be the active chassis.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

BFD TABLE         top

       Contains BFD parameter for ovn-controller BFD configuration. OVN
       BFD implementation is used to provide detection of failures in
       the path between adjacent forwarding engines, including the OVN
       interfaces. OVN BFD provides link status info to OVN northd in
       order to update logical flows according to the status of BFD
       endpoints. In the current implementation OVN BFD is used to check
       next-hop status for ECMP routes. Please note BFD table refers to
       OVN BFD implementation and not to OVS legacy one.

   Summary:
       Configuration:
         logical_port                string
         dst_ip                      string
         min_tx                      optional integer, at least 1
         min_rx                      optional integer
         detect_mult                 optional integer, at least 1
         options                     map of string-string pairs
         external_ids                map of string-string pairs
       Status Reporting:
         status                      optional string, one of admin_down,
                                     down, init, or up

   Details:
     Configuration:

       ovn-northd reads configuration from these columns.

       logical_port: string
              OVN logical port when BFD engine is running.

       dst_ip: string
              BFD peer IP address.

       min_tx: optional integer, at least 1
              This is the minimum interval, in milliseconds, that the
              local system would like to use when transmitting BFD
              Control packets, less any jitter applied. The value zero
              is reserved. Default value is 1000 ms.

       min_rx: optional integer
              This is the minimum interval, in milliseconds, between
              received BFD Control packets that this system is capable
              of supporting, less any jitter applied by the sender. If
              this value is zero, the transmitting system does not want
              the remote system to send any periodic BFD Control
              packets.

       detect_mult: optional integer, at least 1
              Detection time multiplier. The negotiated transmit
              interval, multiplied by this value, provides the Detection
              Time for the receiving system in Asynchronous mode.
              Default value is 5.

       options: map of string-string pairs
              Reserved for future use.

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

     Status Reporting:

       ovn-northd writes BFD status into these columns.

       status: optional string, one of admin_down, down, init, or up
              BFD port logical states. Possible values are:

              •      admin_downdowninitup

Static_MAC_Binding TABLE         top

       Each record represents a Static_MAC_Binding entry for a logical
       router.

   Summary:
       Configuration:
         logical_port                string
         ip                          string
         mac                         string
         override_dynamic_mac        boolean

   Details:
     Configuration:

       ovn-northd reads configuration from these columns and propagates
       the value to SBDB.

       logical_port: string
              The logical router port for the binding.

       ip: string
              The bound IP address.

       mac: string
              The Ethernet address to which the IP is bound.

       override_dynamic_mac: boolean
              Override dynamically learnt MACs.

Chassis_Template_Var TABLE         top

       One record per chassis, each containing a map, variables, between
       template variable names and their value for that specific
       chassis. A template variable has a name and potentially different
       values on different hypervisors in the OVN cluster. For example,
       two rows, R1 = (.chassis=C1, variables={(N: V1)} and R2 =
       (.chassis=C2, variables={(N: V2)} will make ovn-controller
       running on chassis C1 and C2 interpret the token N either as V1
       (on C1) or as V2 (on C2). Users can refer to template variables
       from within other logical components, e.g., within ACL, QoS or
       Logical_Router_Policy matches or from Load_Balancer VIP and
       backend definitions.

       If a template variable is referenced on a chassis for which that
       variable is not defined then ovn-controller running on that
       chassis will just interpret it as a raw string literal.

   Summary:
       chassis                       string (must be unique within
                                     table)
       variables                     map of string-string pairs
       Common Columns:
         external_ids                map of string-string pairs

   Details:
       chassis: string (must be unique within table)
              The chassis this set of variable values applies to.

       variables: map of string-string pairs
              The set of variable values for a given chassis.

     Common Columns:

       external_ids: map of string-string pairs
              See External IDs at the beginning of this document.

COLOPHON         top

       This page is part of the Open Virtual Network (Daemons for Open
       vSwitch that translate virtual network configurations into
       OpenFlow) project.  Information about the project can be found at
       ⟨https://www.ovn.org/⟩.  If you have a bug report for this manual
       page, send it to bugs@openvswitch.org.  This page was obtained
       from the project's upstream Git repository
       ⟨https://github.com/ovn-org/ovn⟩ on 2024-06-14.  (At that time,
       the date of the most recent commit that was found in the
       repository was 2024-06-12.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

Open vSwitch 24.03.90        DB Schema 7.3.1                   ovn-nb(5)

Pages that refer to this page: ovn-sim(1)ovn-architecture(7)ovsdb(7)ovn-nbctl(8)ovn-northd(8)