Re: EIGRP-OSPF Redistribution doesn't reflect the correct next

From: Joe Astorino <joeastorino1982_at_gmail.com>
Date: Thu, 26 Apr 2012 09:27:51 -0400

Like the other guys on the thread said, you likely have some issue
with the OSPF forwarding address getting set to a non-zero value
during redistribution. This can happen generally if your
redistributing router has OSPF configured to run on the interface
facing towards your redistribution point (in your case, the interface
in the EIGRP domain would have been configured for OSPF). There are
very specific requirements to make the forwarding address a non-zero
value though. Go through this list and see if it rings true for you:
Note that ALL of these must be true.

These conditions set the forwarding address field to a non-zero address:

- OSPF is enabled on the ASBR's next hop interface AND
- ASBR's next hop interface is non-passive under OSPF AND
- ASBR's next hop interface is not point-to-point AND
- ASBR's next hop interface is not point-to-multipoint AND
- ASBR's next hop interface address falls under the network range
specified in the router ospf command.

These rules I have references from the following documentation:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009405a.shtml
You can read more about the rules in the official rfc for OSPFv2 as well

HTH

--
Regards,
Joe Astorino
CCIE #24347
http://astorinonetworks.com
"He not busy being born is busy dying" - Dylan
Blogs and organic groups at http://www.ccie.net
Received on Thu Apr 26 2012 - 09:27:51 ART

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