168.1.81 110 00:04:52
172.16.31.100 110 00:04:52
Distance: (default is 110)
Example 4-17 Determining OSPF Route Types (Continued)
166 Chapter 4: Single-Area OSPF Implementation
You can use the debug ip ospf adj command to display OSPF adjacency-related events. This
command is useful when troubleshooting authentication.
If plaintext password authentication is con?¬?gured on the Router X serial 0/0/1 interface but no
authentication is con?¬?gured on the Router Y serial 0/0/1 interface, the routers will not be able to
form an adjacency over that link. The output of the debug ip ospf adj command shown in
Example 4-19 illustrates that the routers report a mismatch in authentication type; no OSPF
packets will be sent between the neighbors.
If plaintext password authentication is con?¬?gured on the Router X serial 0/0/1 interface and on the
router Y serial 0/0/1 interface, but the interfaces are con?¬?gured with different passwords, the
routers will not be able to form an adjacency over that link.
The output of the debug ip ospf adj command shown in Example 4-20 illustrates that the routers
report a mismatch in authentication key; no OSPF packets will be sent between the neighbors.
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