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Problem:
OSPF neighboring not occurring when authentication is enabled.
This article describes how to use the debug facility when troubleshooting OSPF authentication problems on Aruba switches
In the diagram, two Aruba switches are configured for IPV4 and OSPF. All interfaces are configured for OSPF area backbone.OSPF authentication has only been enabled on Rack2sw1. The debug output indicates that switch Rack2sw1 is sending MD5 authentication, and switch Racksw2 is sending no authentication.
The following describes how to enable debug, send the debug output to the buffer, and search the buffer.
Rack2sw2# debug ip ospf packet Rack2sw2# debug destination buffer
Search debug buffer for the "authentication" Rack2sw2# show debug buffer | include authentication :OSPF: invalid packet: Invalid authentication :OSPF: invalid packet: Invalid authentication Search debug buffer for the "Authentication" Rack2sw2# show debug buffer | include Authentication Authentication <MD5> (2 Authentication <None> (0 Search debug buffer to view the complete Hello Message Rack2sw2# show debug buffer | begin RECV :OSPF RECV: 192.168.12.1 -> 224.0.0.5: Version 2, Type Hello (1), Length 44 ret : Router ID 1.1.1.1, Area 0.0.0.0, Authentication <MD5> (2 : Zero: 0, Key ID: 1, Length: 16, Sequence: :OSPF: invalid packet: Invalid authentication type (5 :OSPF SEND: 192.168.12.2 -> 224.0.0.5: Version 2, Type Hello (1), Length 44 ret : : Router ID 2.2.2.2, Area 0.0.0.0, Authentication <None> (0 : Authentication data: 00000000 0000000 : Mask 255.255.255, Options <E> (2), Priority 1, Neighbours : Intervals: Hello 10s, Dead Router 40s, Designated Router 192.168.12.2, Backup
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