Common reasons why an OSPF neighbor relationship between S series switches cannot change to the Full state

Question: What are common reasons why an OSPF neighbor relationship cannot change to the Full state?

Answer: Common causes of this problem include the following:
1. The OSPF network is a non-broadcast multiple access (NBMA) network, and no neighbor is configured.
2. The interval at which the OSPF neighbor sends Hello packets is longer than the aging time of the neighbor relationship.
3. In a stub area or not-so-stubby area (NSSA) area, some switches are not configured as stub or NSSA.
4. The configuration of OSPF verification is incorrect.
5. The OSPF router IDs on two ends of the OSPF link are the same.
6. The network types on two ends of the OSPF link are different.
7. The MTU values on two ends of the OSPF link are different.
8. OSPF is not enabled on the local or remote device.
9. The area numbers on two ends of the OSPF link are different.

Scroll to top