OSPF from first principles through production configuration: link-state database, DR/BDR election, the seven neighbor states, Hello/Dead timers, LSA types, passive interfaces, cost tuning, and complete Cisco IOS CLI examples.
Ospf
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CCNA: OSPF Single-Area Configuration -
FRRouting in Production: The Linux Router That Replaces Cisco for Many Use Cases FRRouting turns commodity Linux into a serious router — the stack behind Cumulus, SONiC, and Cilium's BGP mode. How to run BGP and OSPF in production, and where FRR is a genuine alternative to Cisco and Juniper.
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OSPF for DevOps Engineers: Link-State Routing Without the CCNA OSPF link-state routing explained for DevOps engineers, not CCNA candidates — enough theory to run multiple routers with FRR in a homelab or datacenter, understand areas and LSAs, and debug why a route isn't where you expect.