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Community Member

redistribution igrp/ospf

I am doing mutual redistribution between igrp and ospf over an frame-relay cloud. I have noticed that on the router running only igrp not all of the ospf routes show up and some say "network possibly down". What is the problem?

Thanks, Meg

4 REPLIES
Community Member

Re: redistribution igrp/ospf

IGRP only knows classful routes (A, B, or C). When you redistribute OSPF into IGRP all routes will become classful. Unless all you networks are class C's you may have problems.

Community Member

Re: redistribution igrp/ospf

I have tried both the summary-address and the area xx range commands for ospf, but igrp still sees only a few of the routes. Where might the problem be?

Thanks, Meg

Community Member

Re: redistribution igrp/ospf

I have not seen your config, to me it looks like the routes that you are missing are those routes which traverse a network which is definitely not summarized or is in a different mask as from your IGRP link. Or may be you are trying to summarize Area 0 route which is not possible other than null ing it .

I bet you, if you do show ip route on the IGRP ONLY (Remote) router, the network, which all the missing routes should pass, is also not in the table.

Vikas

Community Member

Re: redistribution igrp/ospf

And as far as network possbilby down message goes, it looks like your you have a serial interface on the remote router which is not using sub interface , hence you need to disable split horizon for what ever protocol you are using.

Vikas

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