Setup Guide
To avoid packet loss, redirect trac through the next lowest-cost link (R3 to R4). Dell EMC Networking OS has the ability to bring LAG 2
down if LAG 1 fails, so that trac can be redirected. This redirection is what is meant by shared LAG state tracking. To achieve this
functionality, you must group LAG 1 and LAG 2 into a single entity, called a failover group.
Conguring Shared LAG State Tracking
To congure shared LAG state tracking, you congure a failover group.
NOTE: If a LAG interface is part of a redundant pair, you cannot use it as a member of a failover group created for shared LAG
state tracking.
1 Enter port-channel failover group mode.
CONFIGURATION mode
port-channel failover-group
2 Create a failover group and specify the two port-channels that will be members of the group.
CONFIG-PO-FAILOVER-GRP mode
group number port-channel number port-channel number
In the following example, LAGs 1 and 2 have been placed into to the same failover group.
Example of LAGs in the Same Failover Group
DellEMC#config
DellEMC(conf)#port-channel failover-group
DellEMC(conf-po-failover-grp)#group 1 port-channel 1 port-channel 2
To view the failover group conguration, use the show running-configuration po-failover-group command.
DellEMC#show running-config po-failover-group
!
port-channel failover-group
group 1 port-channel 1 port-channel 2
As shown in the following illustration, LAGs 1 and 2 are members of a failover group. LAG 1 fails and LAG 2 is brought down after the failure.
This eect is logged by Message 1, in which a console message declares both LAGs down at the same time.
Figure 62. Conguring Shared LAG State Tracking
The following are shared LAG state tracking console messages:
• 2d1h45m: %RPM0-P:CP %IFMGR-5-OSTATE_DN: Changed interface state to down: Po 1
Link Aggregation Control Protocol (LACP)
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