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

       tipc link get { priority | tolerance | window } link LINK

       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 irrelevant.

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 state.

       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 differ.

              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 link.

              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 (highest).

              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 milliseconds.

              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

              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

              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

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

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
       <> 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 <>

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 
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iproute2                         02 Jun 2015                    TIPC-LINK(8)