From: Paul Borghese (pborghese@xxxxxxxxxxxxxx)
Date: Wed Mar 06 2002 - 19:53:18 GMT-3
Good idea! I'll try it!
Thanks!
Paul
----- Original Message -----
From: "Bob Sinclair" <bsin@erols.com>
To: "Paul Borghese" <pborghese@groupstudy.com>
Cc: <ccielab@groupstudy.com>
Sent: Wednesday, March 06, 2002 2:51 PM
Subject: Re: Virtual Links and Backup Interfaces in OSPF
> Paul,
>
> I have been able to get ospf routes from Router A to have a higher or
lower admin distance than ospf routes from Router B. Was able to give the
same ospf route two different admin distances, depending on the source of
the route.
>
> Don't know if it would solve your particular problem.
>
> As I recall, if I want admin distance of 125 for route 172.16.5.0 when it
comes from OSPF RID 6.6.6.6 then:
>
> router ospf 1
> net..
> distance 125 6.6.6.6 0.0.0.0 1
>
> access-list 1 permit 172.16.5.0 0.0.0.255
>
>
> ----- Original Message -----
> From: "Paul Borghese" <pborghese@groupstudy.com>
> To: "Bob Sinclair" <bsin@erols.com>
> Cc: <ccielab@groupstudy.com>
> Sent: Wednesday, March 06, 2002 2:52 PM
> Subject: Re: Virtual Links and Backup Interfaces in OSPF
>
>
> > I don't think this will work as both routes are learned via OSPF. The
admin
> > distance is for selecting which protocol to believe if two different
routing
> > protocols are advertising the same route.
> >
> > Am I missing something?
> >
> > Paul Borghese
> >
> > ----- Original Message -----
> > From: "Bob Sinclair" <bsin@erols.com>
> > To: "Paul Borghese" <paul98@prodigy.net>
> > Cc: <ccielab@groupstudy.com>
> > Sent: Wednesday, March 06, 2002 2:15 PM
> > 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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