From: John Elias (jelias_@xxxxxxxxxxx)
Date: Fri Sep 14 2001 - 11:52:01 GMT-3
Mark,
You are correct, you need to use a route map statement in ospf after you
redistibute denying the routes that are already in the ospf proccess, permit
all other, which would be from igrp or rip or eigrp
John E.
CCIE #8150
>From: "SALMON, MARK (SBMS)" <MARK.SALMON@cingular.com>
>To: "'tom cheung'" <tkc9789@hotmail.com>, omartin@genia.ca,
>jelias_@hotmail.com, Russell.Fear@capgemini.co.uk, ccielab@groupstudy.com
>Subject: RE: Help!
>Date: Fri, 14 Sep 2001 08:35:39 -0500
>
>Maybe I am out to sea here, but it is clear to me that when one does mutual
>redistribution, one MUST use either distribute lists or route maps to block
>routes from being passed back and forth between different routing
>protocols. IF this was done properly, the ISDN connected interface would
>never be redistributed back into OSPF.
>
>Mark Salmon
>Sr. WAN Engineer Great Lakes Region
>Cingular Wireless
>2000 Ameritech Center Drive 3F07B
>Hoffman Estates IL 60195
>Voice: (847)765-3999
>Pager: (847)992-0458
>Email: mark.salmon@cingular.com
>
>
>-----Original Message-----
>From: tom cheung [mailto:tkc9789@hotmail.com]
>Sent: Friday, September 14, 2001 8:18 AM
>To: omartin@genia.ca; jelias_@hotmail.com; Russell.Fear@capgemini.co.uk;
>ccielab@groupstudy.com
>Subject: RE: Help!
>
>
>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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