OSPF routes updating every 10 seconds

[thomuff]

We are starting having issues with a remote location and we noticed that in the route table on the 6509 MSFC, the routes are updating every 10 seconds. First, is that normal? Second, HELP! Thanks Tom

[Harold Ritter]

From the information in the debug output included it is clear that the router with RID 10.240.63.10 is causing that SPF recalculation every 10 seconds. You should start investigating there. What protocol is redistributes in ospf? do you have more than one redistribution point between the two protocols? If so, do you control the redistribution in any way (ACLs, route-maps, etc)?

Hope this helps,

[thomuff]

We redistribute EIGRP into OSPF with route-maps

Question? in access-list 10

we are permiting The Class B 10.10.0.0 for ex. and then denying Class C 10.10.10.0 Is that a problem?

router eigrp 3520

redistribute ospf 1 route-map ospf2eigrp

network 10.x.x.0 0.0.0.255

default-metric 10000 100 255 1 1500

auto-summary

!

router ospf 1

log-adjacency-changes

redistribute eigrp 3520 subnets route-map eigrp2ospf

network 10.x.x.0 0.0.0.255 area 10

network 10.r.r.8 0.0.0.3 area 10

access-list 10 permit 10.x.0.0 0.0.255.255

access-list 10 deny 10.x.x.0 0.0.0.255

access-list 11 permit 10.u.u.u

access-list 11 permit 10.y.y.0 0.0.0.255

access-list 11 permit 10.u.u.0 0.0.0.255

access-list 11 permit 10.l.0.0 0.0.255.255

access-list 11 permit 10.y.b.16 0.0.0.7

!

route-map eigrp2ospf permit 10

match ip address 10

!

route-map ospf2eigrp permit 10

match ip address 11

[Harold Ritter]

You should definitely put the deny first since it is more specific. Currently the deny condition is never met since the permit 10.x.0.0/16 will match the /24 as well.

Hope this helps,