CCNA Foundations: OSPF Day 1 — Single-Area Adjacency

Archive lab

Bring up OSPFv2 adjacency between two branch routers over a point-to-point /30, advertise each site’s user LAN and router loopback in area 0, and verify end-to-end pings succeed from the hosts. The baseline ships with addressing and SSH management ready; you will enable and tune OSPF only.

Learning objectives

• Enable OSPFv2 in a single area (area 0) on a point-to-point transit.
• Set deterministic router-ids using Loopback0 and advertise them.
• Use passive-interface hygiene to limit OSPF to the transit only.
• Verify adjacency, LSAs, and OSPF-learned routes; test host-to-host reachability.

Troubleshooting focus

• Verify every link's interface status and IP addressing (`show ip interface brief`) and correct any interface that is down or misaddressed.
• Confirm each device's running configuration matches the lab objective, and bring any interface, route, or service that is not in its expected state back to health.
• Trace end-to-end reachability with ping/traceroute and isolate the first hop where forwarding fails.