OSPF routes

[cnuvo]

Is it normal for the OSPF routes to be updated in the routing table every 20 sec.,

O 10.11.254.80/28 [110/14] via 10.1.131.131, 00:00:09, FastEthernet5/0/0

As you can see from the partial ?show IP route?, the route was updated 9 sec ago, it keeps updated every 19 sec. Is that normal?

[Danilo Dy]

The route could be flapping, and there are many reason it could do so;

- Link up and down

- Duplicate Router ID

- DDR

- Configuration problem (i.e. redistribution ?)

You have to find out where that route comes from to narrow down your next step.

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800949f7.shtml

[Harold Ritter]

You can use the "show ip ospf statistics" and "show ip ospf statistics detail" to find what causes the route to be reinstalled in the RIB.

Hope this helps,