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

On 4/26/2012 8:51 AM, Sidney D'Souza wrote:
> Yes. The redistributing router has eigrp and ospf running on the same
> interface.
>
> Here is the link to the topology
>
> http://i.imgur.com/zncWW.jpg
>
>
> Regards,
> Sid
> Nobody's really listening, until you make a mistake...
>
> -----Original Message-----
> From: Joe Astorino [mailto:joeastorino1982_at_gmail.com]
> Sent: 26 April 2012 17:28
> To: Sidney D'Souza
> Cc: Cisco certification
> Subject: Re: EIGRP-OSPF Redistribution doesn't reflect the correct next hop
>
> 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
>
>
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>
>
> Hello,
>
>
>
> Only ifyour type 5 LSA has "forwarding address" set to 0.0.0.0 , then
> packets for the external destination should be forwarded to the
> advertising OSPF router [which is 10.1.1.1/R1 in your case],
>
>
>
> else if
>
>
>
> When FA is non-zero meaning which it is preserved to be "10.1.1.2"
> [router which originated the 192.168 prefix in the first place], then that is what will be preserved across ospf domain.
>
>
>
> Can you pls share "show ospf dat ext" with us ?
>
>
>
> HTH
>
> Vijaya

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Received on Thu Apr 26 2012 - 09:18:05 ART