tipc-link(8) — Linux manual page


TIPC-LINK(8)                      Linux                     TIPC-LINK(8)

NAME         top

       tipc-link - show links or modify link properties

SYNOPSIS         top

       tipc link set
               [ { priority PRIORITY | tolerance TOLERANCE | window
               WINDOW } link LINK ] |
               [ { broadcast [ BROADCAST  | REPLICAST  | AUTOSELECT [
               ratio SIZE ] ] } ]

       tipc link get
               [ { priority | tolerance | window } link LINK ] |
               [ { broadcast } ]

       tipc link statistics { show [ link LINK ] | reset link LINK }

       tipc link list

       tipc link monitor set { threshold }

       tipc link monitor get { threshold }

       tipc link monitor summary

       tipc link monitor list
               [ media  { eth | ib } device DEVICE ] |
               [ media udp name NAME ]

OPTIONS         top

       Options (flags) that can be passed anywhere in the command chain.

       -h, --help
              Show help about last valid command. For example tipc link
              --help will show link help and tipc --help will show
              general help. The position of the option in the string is

       -j, -json
              Output results in JavaScript Object Notation (JSON).

       -p, -pretty
              The default JSON format is compact and more efficient to
              parse but hard for most users to read.  This flag adds
              indentation for readability.

DESCRIPTION         top

   Link statistics
       ACTIVE link state
              An ACTIVE link is serving traffic. Two links to the same
              node can become ACTIVE if they have the same link
              priority.  If there is more than two links with the same
              priority the additional links will be put in STANDBY

       STANDBY link state
              A STANDBY link has lower link priority than an ACTIVE
              link. A STANDBY link has control traffic flowing and is
              ready to take over should the ACTIVE link(s) go down.

              The Maximum Transmission Unit. The two endpoints advertise
              their default or configured MTU at initial link setup and
              will agree to use the lower of the two values should they

              The total amount of transmitted or received TIPC packets
              on a link. Including fragmented and bundled packets.

              Represented in the form fragments/fragmented.  Where
              fragmented is the amount of data messages which have been
              broken into fragments.  Subsequently the fragments are the
              total amount of packets that the fragmented messages has
              been broken into.

              Represented in the form bundles/bundled.  If a link
              becomes congested the link will attempt to bundle data
              from small bundled packets into bundles of full MTU size
              packets before they are transmitted.

              Shows the average packet size in octets/bytes for a sample
              of packets. It also shows the packet size distribution of
              the sampled packets in the intervals

              0-64 bytes
              64-256 bytes
              256-1024 bytes
              1024-4096 bytes
              4096-16384 bytes
              16384-32768 bytes
              32768-66000 bytes

       Message counters

              states - Number of link state messages

              probes - Link state messages with probe flag set.
              Typically sent when a link is idle

              nacks - Number of negative acknowledgement (NACK) packets
              sent and received by the link

              defs - Number of packets received out of order

              dups - Number of duplicate packets received

       Congestion link
              The number of times an application has tried to send data
              when the TIPC link was congested

       Send queue
              Max is the maximum amount of messages that has resided in
              the out queue during the statistics collection period of a

              Avg is the average outqueue size during the lifetime of a

   Link properties
              The priority between logical TIPC links to a particular
              node. Link priority can range from 0 (lowest) to 31

              Link tolerance specifies the maximum time in milliseconds
              that TIPC will allow a communication problem to exist
              before taking the link down. The default value is 1500

              The link window controls how many unacknowledged messages
              a link endpoint can have in its transmit queue before
              TIPC's congestion control mechanism is activated.

   Monitor properties
              The threshold specifies the cluster size exceeding which
              the link monitoring algorithm will switch from "full-mesh"
              to "overlapping-ring".  If set of 0 the overlapping-ring
              monitoring is always on and if set to a value larger than
              anticipated cluster size the overlapping-ring is disabled.
              The default value is 32.

   Monitor information
              Represents the event count in a node's local monitoring
              list. It steps every time something changes in the local
              monitor list, including changes in the local domain.

              Represents the current count of cluster members.

              The current supervision algorithm used for neighbour
              monitoring for the bearer.  Possible values are full-mesh
              or overlapping-ring.

              The node status derived by the local node.  Possible
              status are up or down.

              Represent the type of monitoring chosen by the local node.
              Possible values are direct or indirect.

              Represents the domain generation which is the event count
              in a node's local domain. Every time something changes
              (peer add/remove/up/down) the domain generation is stepped
              and a new version of node record is sent to inform the
              neighbors about this change. The domain generation helps
              the receiver of a domain record to know if it should
              ignore or process the record.

              The node status reported by the peer node for the
              succeeding peers in the node list. The Node list is a
              circular list of ascending addresses starting with the
              local node.  Possible status are: U or D. The status U
              implies up and D down.

              Represents the nodes and their status as reported by the
              peer node.  These nodes were not applied to the monitoring
              list for this peer node.  They are usually transient and
              occur during the cluster startup phase or network
              reconfiguration.  Possible status are: U or D. The status
              U implies up and D down.

   Broadcast properties
              Forces all multicast traffic to be transmitted via
              broadcast only, irrespective of cluster size and number of

              Forces all multicast traffic to be transmitted via
              replicast only, irrespective of cluster size and number of

              Auto switching to broadcast or replicast depending on
              cluster size and destination node number.

       ratio SIZE
              Set the AUTOSELECT criteria, percentage of destination
              nodes vs cluster size.

EXAMPLES         top

       tipc link monitor list
           Shows the link monitoring information for cluster members on
           device data0.

       tipc link monitor summary
           The monitor summary command prints the basic attributes.

EXIT STATUS         top

       Exit status is 0 if command was successful or a positive integer
       upon failure.

SEE ALSO         top

       tipc(8), tipc-media(8), tipc-bearer(8), tipc-nametable(8),
       tipc-node(8), tipc-peer(8), tipc-socket(8)

REPORTING BUGS         top

       Report any bugs to the Network Developers mailing list
       <netdev@vger.kernel.org> where the development and maintenance is
       primarily done.  You do not have to be subscribed to the list to
       send a message there.

AUTHOR         top

       Richard Alpe <richard.alpe@ericsson.com>

COLOPHON         top

       This page is part of the iproute2 (utilities for controlling
       TCP/IP networking and traffic) project.  Information about the
       project can be found at 
       If you have a bug report for this manual page, send it to
       netdev@vger.kernel.org, shemminger@osdl.org.  This page was
       obtained from the project's upstream Git repository
       ⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
       2024-06-14.  (At that time, the date of the most recent commit
       that was found in the repository was 2024-06-11.)  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

iproute2                       22 Mar 2019                  TIPC-LINK(8)

Pages that refer to this page: tipc(8)tipc-bearer(8)tipc-media(8)tipc-nametable(8)tipc-node(8)tipc-peer(8)tipc-socket(8)