?– Ensure that both neighbors are part of the same area number and area type.
?– Ensure that authentication type and passwords match.
In Example 4-6, which shows output from the debug ip ospf events command, the neighbor router
and this router are not part of a stub area, denoted by the mismatched E bit. That is, one router is
con?¬?gured for the area to be a transit area, and the other router is con?¬?gured for the area to be a
stub area, as explained in RFC 2328.
To display information about each OSPF packet that is received, use the debug ip ospf packet
privileged EXEC command. The no form of this command disables the debugging output.
The debug ip ospf packet command produces one set of information for each packet that is
received. The output varies slightly depending on which authentication is used. The table shows
sample output from the debug ip ospf packet command when Message Digest 5 (MD5)
authentication is used. Example 4-7 shows an OSPF message received and displayed when using
this debug command.
Example 4-6 debug ip ospf events Command Output
RouterX#ddeebbuugg iipp oossppff eevveennttss
OSPF:hello with invalid timers on interface Ethernet0
hello interval received 10 configured 10
net mask received 255.
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