From: Chris Lewis \(chrlewis\) (chrlewis@cisco.com)
Date: Thu Jul 28 2005 - 14:35:17 GMT-3
Other possible causes of this could be (from Cisco routing protocol
troubleshooting)
1. Forwarding address for external LSA is not known, the router must
learn of the forward address (seen in the ospf database) from an inter
or intra area route. If there is any summarization going on, things like
the inter-area route being less specific than a redistributed route to
the forward address casue the router to prefer the external route,
therefore an inter or inter area route to the forward address does not
make it in to the routing table and the external route will not be
installed.
2. Network type mismatch
3. One side is numbered, other is unnumbered point to point link
Odd -one I think Brian refers to; ABR not generating type 4 summary LSA.
To generate a type 3 or type 4, a router must be connected to area 0, if
it isa router between two non area 0 areas, you must configure a virtual
link.
Chris
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Brian McGahan
Sent: Thursday, July 28, 2005 12:04 PM
To: Schulz, Dave; ccielab@groupstudy.com
Subject: RE: OSPF - link state database to ip rou
Dave,
Did you have a distribute-list applied? Also it could be that
you don't have a route to the forwarding address, but this would only be
a problem for external routes and only happens under a very specific
circumstance. Post your configs along with the "show ip ospf neighbor",
"show ip ospf interface", and "show ip ospf database" output.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Schulz, Dave
> Sent: Thursday, July 28, 2005 6:56 AM
> To: ccielab@groupstudy.com
> Subject: OSPF - link state database to ip rou
>
> I ran into an interesting problem in a lab yesterday. I had a virtual
> link to a remote area 0 in OSPF. Everything was working in OSPF and
> the
virtual
> link.....the virtual link showed up, the OSPF processes where up,
and....I
> could see all the routes in the remote end router under the OSPF
database.
> However, no routes were brought in to the route table. I know I have
done
> this before, but am drawing a blank (no other routing was taking place
on
> this
> router). I tried reloading, and nothing seemed to work. So, the
question
> is....what are the reasons (other than a configured routing protocol
with
> a
> lower admin distance), to keep the routes from being imported into the
> route table? (I was thinking that theere is a problem with the
> router, but
want
> to
> make sure that I am not missing something). Thoughts?
>
> Dave
>
>
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