From: tom cheung (tkc9789@xxxxxxxxxxx)
Date: Fri Sep 14 2001 - 10:18:15 GMT-3
Mutual redistribution in itself does not cause ISDN to flap. It's the ISDN
route which gets redistributed back into OSPF as external route that cause
the demand circuit to come up again.
>From: Olivier Martin <omartin@genia.ca>
>To: 'John Elias' <jelias_@hotmail.com>, tkc9789@hotmail.com,
>Russell.Fear@capgemini.co.uk, ccielab@groupstudy.com
>Subject: RE: Help!
>Date: Fri, 14 Sep 2001 08:57:13 -0400
>
>So what he is doing is mutual redistribution, which seems to be causing the
>problem ?
>
>Olivier
>
>-----Message d'origine-----
>De : John Elias [mailto:jelias_@hotmail.com]
>Envoyi : 14 septembre, 2001 08:51
>@ : tkc9789@hotmail.com; Russell.Fear@capgemini.co.uk;
>ccielab@groupstudy.com
>Objet : Re: Help!
>
>
>Russell,
> Do a 'debug ip ospf lsa' on both of the isdn routers. This will tell
>you which ip is bringing up the isdn line after it comes down. Then filter
>that route out of the redistribution into ospf. You will notice that the
>lsa route that is bring up the link is already part of ospf and igrp is
>trying to put it back into ospf as EX2. Do a 'show ip route' a few times
>on
>
>another router in the topology and you will notice the routes are changing
>from IA to EX2. This is causing a loop in your network.
>
>
>John E.
>CCIE #8150
>
>
> >From: "tom cheung" <tkc9789@hotmail.com>
> >Reply-To: "tom cheung" <tkc9789@hotmail.com>
> >To: Russell.Fear@capgemini.co.uk, ccielab@groupstudy.com
> >Subject: Re: Help!
> >Date: Fri, 14 Sep 2001 06:53:30 -0500
> >
> >It sounds like you're getting feedback loops for your ISDN route. The
> >archives has several threads on this issue.
> >
> >
> >>From: "Fear, Russell H" <Russell.Fear@capgemini.co.uk>
> >>Reply-To: "Fear, Russell H" <Russell.Fear@capgemini.co.uk>
> >>To: "'ccielab@groupstudy.com'" <ccielab@groupstudy.com>
> >>Subject: Help!
> >>Date: Fri, 14 Sep 2001 10:38:25 +0100
> >>
> >>Can anyone in the group help me with thhe following problem.
> >>
> >>I have an ospf router which is redistributing igrp into area 0. It also
> >>has
> >>an isdn back-up as a demand circuit so that if the main connection to
>area
> >>0
> >>dies, the isn kicks in and routes are still available. The problem is
>that
> >>the LSAs caused by the re-distribution bring up the link continually. If
>I
> >>block these, I block routing updates. I cant make the area a stub or an
> >>nssa
> >>because it is area 0 and has two other areas hanging off it.
> >>
> >>Am I missing something obvious ? It's been driving me mad. Help please .
> >>
> >>Russell
> >>
> >>* 700 2201 Internal
> >>* +44 ( 0 ) 870 238 2201 External
> >>* russell.fear@capgemini.co.uk
> >>
> >>
> >>
> >>
> >>
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