in EVPN MPLS multihoming scenarios, high packet loss is observed upon core isolation

in EVPN MPLS scenarios, packet loss is observed when the core link on the PE device goes down.

In situations where CE is multi-homed to more than one PE, a big amount of packet loss is unexpected.

This is actually working as designed.

If BFD is not configured over the BGP session (configured with evpn address-family), then BGP may not go down quickly when the core link goes down.

Core isolation feature needs to see BGP sessions going down so that core isolation gets declared and appropriate actions are taken.

Adding BFD over the evpn BGP session would help with this issue.