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OSPF routes

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?

2 REPLIES

Re: OSPF routes

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

Cisco Employee

Re: OSPF routes

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,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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