SN2201 MLAG domain via eth0 ports connected to each other

[techstack41]

Hello all,

Setting up a basic MLAG domain across a pair of SN2201 switches. As these are the mgmt switches for all devices, we currently have each switches mgmt eth0 cabled to swp48 on the peer switch. Will this work? or would a L3 p2p connection be needed between the switches to facilitate the mlag keep alive link? Currently the MLAG domain is not coming up due to peer unreachable.
SW-1 eth0 → SW-2 swp48
SW-2 eth0 → SW-1 swp48

eth0 interfaces are part of the default vrf.

If this isnt supported. I am thinking we can cable a /30 or /31 between the switches. SW-1 swp47 → SW-2 swp47 and use this link as the mlag backup.

Another option could be to assign loopbacks to each switch and route across the peer link?

thanks
Dan

[halmog]

eth0 is not part of the asic interfaces. It can’t run dynamic routing protocols and can’t be part of a mlag bond.
It can be configured as a backup interface for mlag, as long as a unique IP address is assigned to both eth0s and there is reachability between them.
It is recommended that the backup IP be in a different VRF from the peer IP.