CiscoIOS XE
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How to resolve issues with OSPF not forming adjacencies on Cisco IOS XE devices?
How can I resolve issues with OSPF not forming adjacencies on Cisco IOS XE devices?
CiscoIOS XE
Answers
To resolve OSPF adjacency issues on Cisco IOS XE devices, follow these steps:
- Verify Interface Configuration: Ensure all interfaces have correct IP addresses and subnet masks.
- Check OSPF Network Statements: Confirm that the network statements correctly include all relevant interfaces.
- Ensure Matching Hello/Dead Intervals: Verify that Hello and Dead intervals match between neighbors.
- Check Network Type: Ensure interfaces are configured with the correct network type (e.g., Broadcast, Point-to-Point).
- Inspect Authentication: If using OSPF authentication, confirm that both neighbors use the same type and password.
- Monitor Adjacencies: Use debug ip ospf adj and log-adjacency-changes commands to monitor adjacency states.
- Check for Access Lists: Ensure no access lists are blocking OSPF traffic.
- Verify MTU Size: Ensure the MTU size is consistent across all interfaces.
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