548 | Link Aggregation Control Protocolw w w . d e l l . c o m | s u p p o r t . d e l l . c o m In Figure 24-8, LAGs 1 and 2 are members of a failover group. LAG 1 fails and LAG 2 is brought downupon the failure. This effect is logged by Message 2, in which a console message declares both LAGsdown at the same time.Figure 24-8. Shared LAG State TrackingView the status of a failover group member using the command show interface port-channel, as shown inFigure 24-9.Figure 24-9. Viewing Status of a Failover Group MemberImportant Points about Shared LAG State Tracking• This feature is available for static and dynamic LAGs.Message 2 Shared LAG State Tracking Console Message2d1h45m: %RPM0-P:CP %IFMGR-5-OSTATE_DN: Changed interface state to down: Po 12d1h45m: %RPM0-P:CP %IFMGR-5-OSTATE_DN: Changed interface state to down: Po 2Note: The set of console messages shown in Message 2 appear only if Shared LAG State Tracking isconfigured on that router (the feature can be configured on one or both sides of a link). For example, inFigure 24-8, if Shared LAG State Tracking is configured on R2 only, then no messages appear on R4regarding the state of LAGs in a failover group.Po 1Po 2fnC0049mpR1R2 R3R4R2(conf)# port-channel failover-groupR2(conf-po-failover-grp)# group 1 port-channel 1 port-channel 2R2#show interface Port-channel 2Port-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:e8:4cInterface index is 1107755010Minimum number of links to bring Port-channel up is 1Port-channel is part of failover-group 1Internet address is not setMTU 1554 bytes, IP MTU 1500 bytesLineSpeed 1000 MbitMembers in this channel: Gi 1/17(U)ARP type: ARPA, ARP Timeout 04:00:00Last clearing of "show interface" counters 00:01:28Queueing strategy: fifo
