Reference Guide

Figure 56. Configuring Shared LAG State Tracking
The following are shared LAG state tracking console messages:
● 2d1h45m: %SYSTEM-P:CP %IFMGR-5-OSTATE_DN: Changed interface state to down: Po 1
● 2d1h45m: %SYSTEM-P:CP %IFMGR-5-OSTATE_DN: Changed interface state to down: Po 2
To view the status of a failover group member, use the show interface port-channel command.
R2#show interface port-channel 2
Port-channel 2 is up, line protocol is down (Failover-group 1 is down)
Hardware address is 00:01:e8:05:e8:4c, Current address is 00:01:e8:05:e8:4c
Interface index is 1107755010
Minimum number of links to bring Port-channel up is 1
Port-channel is part of failover-group 1
Internet address is not set
MTU 1554 bytes, IP MTU 1500 bytes
LineSpeed 1000 Mbit
Members in this channel: Te 1/17(U)
ARP type: ARPA, ARP Timeout 04:00:00
Last clearing of "show interface" counters 00:01:28
Queueing strategy: fifo
NOTE:
The set of console messages shown above appear only if you configure shared LAG state tracking on that router
(you can configure the feature on one or both sides of a link). For example, as previously shown, if you configured shared
LAG state tracking on R2 only, no messages appear on R4 regarding the state of LAGs in a failover group.
Important Points about Shared LAG State Tracking
The following is more information about shared LAG state tracking.
● This feature is available for static and dynamic LAGs.
● Only a LAG can be a member of a failover group.
● You can configure shared LAG state tracking on one side of a link or on both sides.
● If a LAG that is part of a failover group is deleted, the failover group is deleted.
● If a LAG moves to the Down state due to this feature, its members may still be in the Up state.
434
Link Aggregation Control Protocol (LACP)