TIPC-LINK(8) Linux TIPC-LINK(8)NAMEtipc-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
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.
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 frag‐
ments. Subsequently the fragments are the total amount of pack‐
ets that the fragmented messages has been broken into.
Bundles
Represented in the form bundles/bundled. If a link becomes con‐
gested 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 sam‐
pled 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.
Monitor properties
threshold
The threshold specifies the cluster size exceeding which the
link monitoring algorithm will switch from "full-mesh" to "over‐
lapping-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 local 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. Pos‐
sible 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 circular list of
ascending addresses starting with the local node. Possible sta‐
tus are: U or D. The status U implies 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 monitoring list for
this peer node. They are usually transient and occur during the
cluster startup phase or network reconfiguration. Possible sta‐
tus are: U or D. The status U implies up and D down.
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 ALSOtipc(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 <net‐
dev@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>
iproute2 02 Jun 2015 TIPC-LINK(8)
