When it comes to basic OSPF troubleshooting the first-aid kit is Neighbor states and things, that should match to form an adjacency. And on one early morning while refreshing my memory on OSPF neighbor states I accidentally ran into quite interesting problem.
But before we start, answer the short question:
Will adjacency be formed between directly connected via Gig. Ethernet interfaces routers R1 and R2 if
- R1’s OSPF interface type configured as point-to-point
- R2’s OSPF interface type configured as broadcast
Time’s up. The answer is – yes and no. Wanna know why? Jump in, I have to show you something.