How and where do you configure MLAG health check message config? I have read in the Exos userguide 15_7 that this is now a feature however it does not give to much information on how and where to configure this. Has anyone configured this and had it working? Is this feature available in summitX-15.5.3.4-patch1-5.xos or do i need to upgrade to get this feature?
(page 278 of userguide)
"Starting in ExtremeXOS 15.5, health check messages can also be exchanged on an alternate path byseparate configuration – typically the “Mgmt” VLAN. If the peer is alive when the ISC link alone goes down, one of the MLAG peers disables its MLAG ports to prevent duplicate south-bound traffic to the remote node. To reduce the amount of traffic on the alternate path, health check messages are initiated on the alternate path only when the ISC link goes down. When the ISC link is up, no health check messages are exchanged on the alternate path.
When the MLAG switch misses 3 consecutive health check messages from the peer, it declares that the MLAG peer is not reachable on the ISC link. It then starts sending out health check messages on the alternate path to check if the peer is alive. When the first health check message is received from the MLAG peer on the alternate path, it means that the peer is alive. In this scenario, one of the MLAG peersdisables its MLAG ports to prevent duplication of south-bound traffic to the remote node.
Note
The MLAG switch having the lower IP address for the alternate path VLAN disables its ports.
When the ISC link comes up and the switch starts receiving health check messages on the ISC control VLAN, the ports that were disabled earlier have to be re-enabled. This action is not performed immediately on the receipt of the first health check message on the ISC control VLAN. Instead the switch waits for 2 seconds before enabling the previously disabled ports. This is done to prevent frequent enabling and disabling of MLAG ports due to a faulty ISC link up event.
