OSPF Network Types: DR/BDR, Broadcast vs P2P

Bundle lab · $29.99

Hands-on CCNP OSPF lab comparing broadcast and point-to-point network types. Three routers share a multi-access Ethernet via an access switch to observe DR/BDR election, manipulate interface priorities, and then convert to point-to-point. Includes a user LAN behind R1 and realistic troubleshooting: neighbor stuck in 2-Way due to type mismatch, area mismatch isolating a router, and incorrect interface priority preventing desired DR/BDR roles.

Learning objectives

• Deploy OSPFv2 on three routers sharing a broadcast segment and advertise loopbacks and a user LAN.
• Observe and interpret default DR/BDR/DROTHER roles on a broadcast network.
• Influence DR/BDR election with interface priorities and understand re-election behavior.
• Convert an OSPF interface from broadcast to point-to-point and analyze adjacency changes and the absence of DR/BDR.
• Diagnose and recover OSPF adjacency problems: network type mismatch (2-Way) and area mismatch (Down).
• Verify adjacencies and end-to-end reachability from a real host on the routed LAN.

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.