I have Lan/Wan setup in my office with Cisco routers & switches. OSPF is running on serial as well as multiaccess network. Yesterday I noticed that 2 routers changed adjacency from FULL/DROTHER to 2WAY/DROTHER. Network is running fine without any outage and impact. Later I noticed that a switch is installed on both of these routers interface that changed the adjacency but switch ports are up and running. My question is
- why routers changed the OSPF adjacency ?