Symptom

BGP process may crash when receiving IPv4 prefix from IPv6 BGP peer.

Conditions

IPv6 BGP peer sending IPv4 Prefix has not sent Extended NH Capability in OPEN msg indicating it's support for RFC5549. However, later on, sender sends IPv4 Prefix with IPv6 NH

Workaround

Don't accept any IPv4 Prefix from an IPv6 BGP peer if the peer didn't send the Extended NH Capability. Use inbound route-policy to drop the prefixes.

Further Problem Description