What if the router ID of the OSPF router is duplicated?

OSPF Area Type

OSPF LSA Type

Synchronization process of OSPF LSDB

Details of enabling OSPF on the interface

How show ip ospf neighbor looks on Ethernet

OSPF Neighbor and Adjacency

OSPF Router Type

OSPF Area – Inside the area, in detail; outside the area, ...

Problems with large-scale OSPF network