Reference Guide

Link Aggregation Control Protocol | 535
Configure Shared LAG State Tracking
To configure Shared LAG State Tracking, you configure a failover group:
In the following example, LAGs 1 and 2 have been placed into to the same failover group.
R2#config
R2(conf)#port-channel failover-group
R2(conf-po-failover-grp)#group 1 port-channel 1 port-channel 2
View the failover group configuration using the show running-configuration po-failover-group
command, as shown in the following example.
R2#show running-config po-failover-group
!
port-channel failover-group
group 1 port-channel 1 port-channel 2
In Figure 27-2, LAGs 1 and 2 are members of a failover group. LAG 1 fails and LAG 2 is brought down
upon the failure. This effect is logged by Message 2, in which a console message declares both LAGs
down at the same time.
Figure 27-2. Shared LAG State Tracking
Step Task Command Command Mode
1
Enter port-channel failover group mode.
port-channel failover-group
CONFIGURATION
2
Create a failover group and specify the
two port-channels that will be members
of the group.
group number port-channel
number port-channel
number
CONFIG-PO-FAILOVER-GRP
Message 2 Shared LAG State Tracking Console Message
2d1h45m: %RPM0-P:CP %IFMGR-5-OSTATE_DN: Changed interface state to down: Po 1
2d1h45m: %RPM0-P:CP %IFMGR-5-OSTATE_DN: Changed interface state to down: Po 2
Po 1
Po 2
fnC0049mp
R1
R2 R3
R4
R2(conf)# port-channel failover-group
R2(conf-po-failover-grp)# group 1 port-channel 1 port-channel 2