Symptom
C9300X with BFD peering
ARP flooding causes BFD flapping.
Issue seen only when amount of APR queries is very high.
more then 1G of ARP has to be injected in one interface.
COPP by default will drop packets above 4k pps for ARP hitting control plane.
no drops seen on interfaces injecting the ARP packets os the interface doing the BFD peering
Conditions
2 C9300X with BFD peering.
Receives high amount of ARP packets on one interface more then 1G of traffic from ARP requests
no interface drops and links have more then enough capacity for the generated traffic.
Workaround
ARPs have to be blocked at interface level.
broadcast storm should solve the problem.
Further Problem Description
COPP protetion will drop ARP flooding but will not prevent impact on control plane packet processing.