debug ip ospf events




debug ip ospf events

no debug ip ospf events

Syntax Description:

This command has no arguments or keywords.

Command Description:


To display information on Open Shortest Path First (OSPF)-related events, such as adjacencies, flooding information, designated router selection, and shortest path first (SPF) calculation, use the debug ip ospf events privileged EXEC command. The no form of this command disables debugging output.


The following is sample output from the debug ip ospf events command:

Router# debug ip ospf events

OSPF:hello with invalid timers on interface Ethernet0

hello interval received 10 configured 10

net mask received configured

dead interval received 40 configured 30

The debug ip ospf events output shown might appear if any of the following situations occurs:

The IP subnet masks for routers on the same network do not match.

The OSPF hello interval for the router does not match that configured for a neighbor.

The OSPF dead interval for the router does not match that configured for a neighbor.

If a router configured for OSPF routing is not seeing an OSPF neighbor on an attached network, perform the following tasks:

Make sure that both routers have been configured with the same IP mask, OSPF hello interval, andOSPF dead interval.

Make sure that both neighbors are part of the same area type.

In the following example line, the neighbor and this router are not part of a stub area (that is, one is a part of a transit area and the other is a part of a stub area, as explained in RFC 1247):

OSPF: hello packet with mismatched E bit



Related Commands:

debug ip ospf adj� 

debug ip ospf packet  

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