NAME

       tipc-link - show links or modify link properties

SYNOPSIS

       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

OPTIONS

       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

   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.

       MTU
              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.

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

       Fragments
              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.

       Bundles
              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.

       Profile
              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.

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

       tolerance
              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.

       window
              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.

EXIT STATUS

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

SEE ALSO

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

REPORTING BUGS

       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

       Richard Alpe <richard.alpe@ericsson.com>