Reference Guide

490 | Link Aggregation Control Protocol (LACP)
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Important Points 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.
• Shared LAG State Tracking can be configured 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.
LACP Basic Configuration Example
The screenshots in this section are based on the example topology shown in Figure 25-10. Two routers are
named ALPHA and BRAVO, and their host name prompts reflect those names.
The sections are:
• Configuring a LAG on ALPHA on page 491
• Summary of the configuration on ALPHA on page 494
• Summary of the configuration on BRAVO on page 495
Figure 25-10. LACP Sample Topology
Note: The set of console messages shown in Message 1 appear only if Shared LAG State Tracking is
configured on that router (the feature can be configured on one or both sides of a link). For example, in
Figure 25-8, if Shared LAG State Tracking is configured on R2 only, then no messages appear on R4
regarding the state of LAGs in a failover group.
Gig 2/31
Gig 3/21
Gig 2/32
Gig 3/22
Gig 2/33
Gig 3/23
Port Channel 10
ALPHA
BRAVO