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New Member

IGRP Issue

I have this problem:

R4's loopback address is 170.100.40.4/29 running EIGRP.

R4's Serial 1/0 interface's address is 170.100.124.4/24 running OSPF.

Mutual redistribution is also configured on R4.

R2 S0/0 170.100.124.2/24is connected to R4 through FR with OSPF Routing Protocol. Due to redistribtution on R4, I am able to see 170.100.40.4/29 route on R2. Everthing is fine at that point. (Multipoint Frame Relay)

R2 S1/0 170.100.23.2/24 is connected to R3 S0/0 170.100.23/24 (Point-to-Point FR) running IGRP.

Mutual Redistribution is configured on R2 as well. Obviously I am not able to see the route 170.100.40.4/29 from R4 into R3 routing table due to the classful nature of IGRP protocol.

The only work around I could have done is to summarize route 170.100.40.4/29 on R4.

Here is what I did.

R4's S1/0

ip summary-address eigrp 1 170.100.40.0 255.255.255.0. I expected to see the route 170.100.40.0/24 on R2's routing table so then it would redistribute that route to IGRP and then R3 would be able to see

this route, but didn't work. Somehow R2's is still getting the 170.100.40.4/29 route.

Am I doing something wrong?

Regards,

3 REPLIES
Silver

Re: IGRP Issue

the 170.100.40.4/29 is more specific , this is the reason it is being put in the routing table. you may want to use a route-map with your redistribution that denies the 170.100.40.4 /29 ip from being redistributed

New Member

Re: IGRP Issue

You got me wrong. I don't want to deny 170.100.40.4/29 network. I want that network to be seen by R3. Since R3 is running IGRP it can't see network beyond /24 bit masks.

What would be the work around that is what my question was?

Thanks

Re: IGRP Issue

170.100.40.4/29 is running EIGRP. So there is no use of giving an "ip summary-address eigrp " command on the serial interface s1/0 of R4, (since this interface is running OSPF)....

You need to summarize the route via OSPF.

On R4, under OSPFgive a "summary-address 170.100.40.0 255.255.255.0" so that the redistributed route 170.100.40.4/29 will appear as 170.100.40.0/24 on R2.

Hope that helps@!

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