From: Chuck Larrieu (chuck@xxxxxxxxxxxxx)
Date: Sat Feb 24 2001 - 16:47:06 GMT-3
Ran into an interesting situation in the virtual link scenario in the
Slattery/Burton book page 224.
Area_1-Router_Q-area_2-router_R-area_2-router_S-area_3-router_T-area_0
To create the virtual link from area 1 to area 0, what do you do?
The book answer, which I validated, is to create two virtual links - one
from router_q to router_s, and a second one from router_s to router_t. it
seems odd, but that's the way it works. Apparently one cannot create a
single virtual link that crosses two ( or more ) transit areas.
( yes, Nigel, I did modify what the book scenario presents. In the book what
one is asked to create is a virtual link to act as a redundant link to area
0. But the principal is the same. )
just another one of those little things that probably won't matter one way
or another.
Chuck
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Erick B.
Sent: Thursday, February 22, 2001 11:12 PM
To: Daniel M. Dawson; 'Devon Watkins'; ccielab@groupstudy.com
Subject: RE: OSPF virtual link
It also has to be the RID for the ABR for that area,
which may not be router it is between. This is one
thing people overlook. If you look at the show ip ospf
commands it will report the RID there that is
advertising. Reload or remove/add the OSPF process
back to make sure the RID doesn't change after a
reload because of a new higher IP address somewhere,
etc.
--- "Daniel M. Dawson" <dandawson@lucent.com> wrote:
> I think your problem is that the IP addresses that
> your put on the command
> line after the virtual-link keyword has to be the
> OSPF router ID not just
> any interface.
>
> Daniel M. Dawson
> Member Consulting Staff
> Lucent Worldwide Services
> Lucent Technologies
> Mobile: (405) 850-1493
> Pager: (800) 622-9202
> E-mail: dandawson@lucent.com
>
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com]On Behalf Of
> Devon Watkins
> Sent: Thursday, February 22, 2001 10:13 PM
> To: ccielab@groupstudy.com
> Subject: OSPF virtual link
>
>
> Group,
>
> I am working on OSPF virtual links. In the past I
> had thought was fairly
> easy, but now I have a problem that has me stumped.
>
> Here is what I have:
>
> Rtr 1 has an ethernet link in area 1
> Rrt 2 has an ethernet link in area 1 also
> Rtr 2 has a link in area 0
>
> so far so good, but then...
> I add a serial interface on Rtr 1 to area 2 and add
> the following config
> info:
>
> rtr 1
>
> area 1 virtual-link <pingable ip on rtr 2, in area
> 0>
>
> rtr 2
>
> area 1 virtial-link <ip interface of serial
> interface in area 2 of rtr1 (is
> pingable)>
>
> Any idea of what I am screwing up?
>
> Thanks
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