Yesterday's network outage caused some hosts' connectivity to flap, which caused BFD and BGP to flap and the anycast IPs they were advertising to be partially unreachable the time BFD detects the failure (3x300ms) and BGP converges.
To limit that issue, we can push BGP damping on those sessions, similarly to T222424.
As we have multiple anycast nodes in multiple DCs the risk of them all being damped at the same time is very low.
The change (to do in Homer) should be along the lines of the following, re-using the existing damping parameters:
[edit protocols bgp group Anycast4] + damping; [edit policy-options policy-statement anycast_import term anycast4 then] + damping default;