topic Have you verified if this in Routing and SD-WAN

why ospf routes refresh every 10 seconds

djsonicdh — Tue, 05 Mar 2019 16:20:16 GMT

Hi, i have a problem, the routers of ospf in the ip route table refresh every 10 seconds. The router has no dropped interfaces and no other log that indicates a particular problem. The ospf neighbors its ok.

System: WS-C6509 with Supervisor Engine 720

IOS version:12.2(33)SXJ10

Function of router: Backbone core, area 0 OSPF, has a couple of static routes with redistribution (redistribute static subnets)

Hi

Julio E. Moisa — Tue, 11 Apr 2017 13:44:13 GMT

Are The refreshed routes external? or are they learned by OSPF? If they are external (E1 or E2) it could be a problem when the router who is injecting the routes or any redistribution problem like loops.

All routes (O E1, O E2, O IA)

djsonicdh — Tue, 11 Apr 2017 14:14:17 GMT

All routes (O E1, O E2, O IA) refresh every 10 seconds exactly (all of the same time).

Have you verified if this

Julio E. Moisa — Tue, 11 Apr 2017 14:17:58 GMT

Have you verified if this behavior is showed on the DR? Also you can use show ip ospf statistics detail to determinate what happen.

I have a lot of neighbors.

djsonicdh — Tue, 11 Apr 2017 14:31:29 GMT

I have a lot of neighbors. Somes have point-to-point (no DR or BDR elected), and others have DR and BDR. I verefied in the DR neighbors, BDR neighbors and point-to-point neighbors and not have this problem.

EDIT: i cant upload files, but heres the show ip ospf statistics detail

https://www.dropbox.com/s/eqxpk5vp20kwoep/log.log?dl=0

State
FULL/ -
FULL/ -
FULL/ -
FULL/ -
FULL/ -
FULL/ -
FULL/ -
FULL/DR
FULL/BDR
FULL/BDR
FULL/DR
FULL/DR
FULL/BDR
FULL/BDR
FULL/DR
FULL/BDR
FULL/DR
FULL/DR
FULL/BDR
FULL/ -
FULL/ -

It could be a flapping

Julio E. Moisa — Tue, 11 Apr 2017 15:32:53 GMT

It could be a flapping interface on your topology, have the OSPF timers modified or any change recently? Also try to configure ispf under the OSPF process to keep the changes into the each area.

 Area 0: SPF algorithm executed 1379229 times

Hello

paul driver — Tue, 11 Apr 2017 15:38:12 GMT

Hello

Try to summarize where applicable and any areas that are not transit areas can be made stub areas so to decrease the amounts of lsa's from being refresh throughout the whole ospf domain

You can also enable incremental SPF (ISPF)in the router stanza - this can assist in negating a full spf tree recalculation when changes to type 1/2 lsa occurs, so Ospf only recalculates the part of the spf tree that needs to be done.

res
paul

check the router with router

ROHANTARDEKAR — Fri, 28 Apr 2017 20:41:08 GMT

check the router with router-id

161.131.1.216  there might be interface flapping on that router

Re: why ospf routes refresh every 10 seconds

eng.tamer_badawy — Sat, 04 Aug 2018 18:08:54 GMT

You may have duplicated range of IP addresses learned from multi location

Or duplicated loopback IP addresses

Re: why ospf routes refresh every 10 seconds

cristian.diego.molina — Mon, 08 Oct 2018 17:00:08 GMT

thanks,
this was my problem. duplicate ip addresses.