From: Joe Jia (ellenjjl@xxxxxxxxxx)
Date: Thu Mar 07 2002 - 00:52:10 GMT-3
Hi,
Why not put ISDN on area 100, same as r2 to r5, and virtual-link between
r1-r5(ISDN)?
If wrong, please correct.
Thanks.
Joe
----- Original Message -----
From: <RSiddappa@NECBNS.com>
To: <bsin@erols.com>; <paul98@prodigy.net>
Cc: <ccielab@groupstudy.com>
Sent: Wednesday, March 06, 2002 4:35 PM
Subject: RE: Virtual Links and Backup Interfaces in OSPF
> This is agin one more similar problem of Intra area rouete to Interarea
> route.
>
> if u look at the routing table it is prefering the
>
> route Marked with O over IA.
>
> One of the tricsk u can try is to creat one more OSPF process in router R5
> and put the ISDN interafce that roting process and then redisritbuting
that
> in to the main OPSF process at R5. The the routes thorugh ISDN will appera
> as External rouets and R5 will prefere, the serail link.
>
> this is the similar solution given found by Chau parry for one of the same
> kind of problems and credit shoudl go to him if it works.
>
> I Have not tested.
>
> R.
>
> -----Original Message-----
> From: Bob Sinclair [mailto:bsin@erols.com]
> Sent: Wednesday, March 06, 2002 1:16 PM
> To: Paul Borghese
> Cc: ccielab@groupstudy.com
> Subject: Re: Virtual Links and Backup Interfaces in OSPF
>
>
> Just a thought: what if you raised the admin distance for ospf routes
> learned from the router on the other side of the BRI? I have had some
> success doing this with ospf.
>
> ----- Original Message -----
> From: "Paul Borghese" <paul98@prodigy.net>
> To: <ccielab@groupstudy.com>
> Sent: Wednesday, March 06, 2002 1:34 PM
> Subject: Virtual Links and Backup Interfaces in OSPF
>
>
> > Hi,
> >
> > I have created a practice scenario using the following setup (OSPF
> protocol):
> >
> > R1 is connected to R2 and the connection is in Area 0. R2 is connected
to
> R5
> > in Area 100. R5 has a backup ISDN link to R1. I made this backup Link
> area
> > 101 and created a virtual link through area 101 to connect Area 100 in
> case
> > the connection to R2 ever went down. R1 has a route (172.16.1.0) which
is
> in
> > Area 0.
> >
> > The problem I am having is R5 always prefers to use the BRI interface to
> get
> > to 172.16.1.0 instead of using the connection to R2. I even set the
cost
> of
> > the BRI interface to be 10x that of the R2 connection. Here is the
> results on
> > R5:
> >
> > With the ISDN line active:
> > 172.16.0.0/24 is subnetted, 1 subnets
> > O 172.16.1.0 [110/10010] via 190.27.1.66, 00:52:04, Dialer0
> >
> > With the ISDN in Shutdown mode:
> > 172.16.0.0/24 is subnetted, 1 subnets
> > O IA 172.16.1.0 [110/943] via 190.27.1.33, 00:00:03, Serial4
> >
> > Notice with the ISDN active, the router prefers to use the Dialer
> interface
> > even though the metric is 10010 versus the Serial 4 interface with a
> metric of
> > 943! I believe this is because the route learned via the Dialer0
> interface is
> > an interior route and the route learned via the S4 interface is an
> InterArea
> > route.
> >
> > So is there any way to get R5 to prefer the S4 route with the Dialer
> interface
> > active? Of course one way to fix this would be to make the ISDN line
> area
> > 100 and dump the Virtual Link. But I am wondering if there is a way to
do
> it
> > using the typology I created.
> >
> > Paul Borghese
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