Troubleshooting OSPF duplicate router IDs in VPLS networks: discovering 10-second route flapping caused by cloned PE router configuration, identifying router ID duplication, and understanding network-wide effects of duplicate router identifiers in MPLS service provider deployments.
Setting up anycast services using Bird OSPF to inject /32 and /128 routes across multiple locations. Using FreeBSD VMs for redundant IPv4/IPv6 anycast DNS and web services.