Redistribution eigrp-ospf

bapatsubodh · ‎02-25-2010

Hi,

Here is the simple scenario

R0---> serial link 192.168.1.0 /30 EIGRP----->R1 serial link ---> 192.168.1.4 /30 OSPF area 0 -----> R2

R0 is connected to R1 on serial link with subnet 192.168.1.0 /30 EIGRP neighbor relationship formed ( no -auto-summary configured )

R1 is connected to R2 on serial link with subnet 192.168.1.4 /30 OSPF area 0 neighbor relationship formed.

No other networks are published in any of the routers.

So far there are no routes learned either by EIGRP or by OSPF all are connected routers.

on R1 we redistributed ospf into eigrp and vice-a-versa

router eigrp 10

redistribute ospf 11 metric 2000 0 255 1 1500

network 192.168.1.0 0.0.0.3

no auto-summary

!

router ospf 11

log-adjacency-changes

redistribute eigrp 10 subnets

network 192.168.1.4 0.0.0.3 area 0

The routing tables on R0 it shows only connected network

Gateway of last resort is not set

192.168.1.0/30 is subnetted, 1 subnets
C 192.168.1.0 is directly connected, Serial1/0

It do not show the 192.168.1.4 /30 subnet, on this subnet OSPF is enabled on R1

now if we see the R2 router routing table :

     192.168.1.0/30 is subnetted, 2 subnets
O E2    192.168.1.0 [110/20] via 192.168.1.5, 00:20:46, Serial1/0
C       192.168.1.4 is directly connected, Serial1/0
Router#

It shows the 192.168.1.0 /30 subnet on which Eigrp is enabled on R1.

Why is it so that only one subnet is getting redistribued into OSPF, why OSPF enabled interface subnet is not getting redistributed in EIGRP?

But subnets in OSPF on router R2 , are appearing in R0 routing table, redistribution is working ok for all subnets except the

connected subnet 192.168.1.4 /30.

Please share the experience.

Thanks

Subodh

Jerry Ye · ‎02-25-2010

Does your R0 has no auto-summary?

If you can post the routing config for both R0 and R2, that will be great.

Regards,

jerry

bapatsubodh · ‎02-25-2010

Hi,

R0 is running OSPF so auto summary is not configured on R0.

I just dont believe myself, I reloaded all three routers and it is working now.

I can see all the routes on R0

Gateway of last resort is not set

     192.168.1.0/30 is subnetted, 2 subnets
C       192.168.1.0 is directly connected, Serial1/0
D EX    192.168.1.4 [170/2169856] via 192.168.1.2, 00:00:06, Serial1/0 ( this route was not showing up in the routing table )
Router#

Thanks

Subodh

Jerry Ye · ‎02-25-2010

Your description on the original post lead me to believe your R0 is running EIGRP

R0---> serial link 192.168.1.0 /30 EIGRP----->R1 serial link ---> 192.168.1.4 /30 OSPF area 0 -----> R2

Please clarify.

Regards,

jerry

bapatsubodh · ‎02-25-2010

Hi Jeye,

Sorry for that,

On RO and R1 "no auto-summary" is configured in EIGRP Process and for R2 it is OSPF so no need for that.

But my problem is resolved for now after reloading.

Thanks

subodh

Jerry Ye · ‎02-25-2010

Okay. Good to know.

Regards,

jerry

bapatsubodh · ‎02-25-2010

Hi Jeye,

I have some another questions on Route-maps used for route-filtering. Well I am able to do get my intended results but I am still confused about the logic used by route-maps when used for redistribution.

I had earlier posted my route-map redistribution results i got the answer also but still could not get the logic.

I will be posting it again.

Thanks again

Subodh

Jerry Ye · ‎02-25-2010

Okay, just post whatever you don't understand. Someone here will help you understand it.

Regards,

jerry