Manual: tipc-link
TIPC-LINK(8) Linux TIPC-LINK(8)
NAME
tipc-link - show links or modify link properties
SYNOPSIS
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
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.
-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
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 mes‐
sages 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 distribu‐
tion 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 acknowledgment (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 pe‐
riod 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 ex‐
ist 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 be‐
fore TIPC's congestion control mechanism is activated.
Monitor properties
threshold
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
table_generation
Represents the event count in a node's local monitoring list. It steps every time something changes in the lo‐
cal monitor list, including changes in the local domain.
cluster_size
Represents the current count of cluster members.
algorithm
The current supervision algorithm used for neighbour monitoring for the bearer. Possible values are full-mesh
or overlapping-ring.
status
The node status derived by the local node. Possible status are up or down.
monitored
Represent the type of monitoring chosen by the local node. Possible values are direct or indirect.
generation
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.
applied_node_status
The node status reported by the peer node for the succeeding peers in the node list. The Node list is a circu‐
lar list of ascending addresses starting with the local node. Possible status are: U or D. The status U im‐
plies up and D down.
[non_applied_node:status]
Represents the nodes and their status as reported by the peer node. These nodes were not applied to the moni‐
toring list for this peer node. They are usually transient and occur during the cluster startup phase or net‐
work reconfiguration. Possible status are: U or D. The status U implies up and D down.
Broadcast properties
BROADCAST
Forces all multicast traffic to be transmitted via broadcast only, irrespective of cluster size and number of
destinations.
REPLICAST
Forces all multicast traffic to be transmitted via replicast only, irrespective of cluster size and number of
destinations.
AUTOSELECT
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
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
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-peer(8), tipc-socket(8)
REPORTING BUGS
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
Richard Alpe
iproute2 22 Mar 2019 TIPC-LINK(8)