From: Scott Morris (smorris@ipexpert.com)
Date: Tue Mar 18 2008 - 14:05:23 ART
There was a discussion here on GS a while back about this (I'm guessing it
was the same lab!) and back then I think the "trick" was that if you place
something in Area 0, the virtual link will then come up. Even if you remove
a loopback from Area 0, the VL will remain up, at least until the
process/router restarts!
My guess is that this has been revised since it's a little TOO tricky, but
at least interesting to think through. :)
You'd need to check their web site though to be sure on the updates. Or
perhaps someone else who knows more about their products will chime in!
Cheers,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M
#153, JNCIS-ER, CISSP, et al.
CCSI/JNCI-M/JNCI-ER
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Ahsan Mohiuddin
Sent: Tuesday, March 18, 2008 7:22 AM
To: Andy
Cc: ccielab@groupstudy.com
Subject: Re: ie core lab 3 / task 4.5
That's incorrect. See below:
4.6. OSPF Loopback Advertisement
Advertise the Loopback0 network of R1 and SW1 into OSPF area 17.
These networks should appear in all other OSPF enabled routers with a
/24 subnet mask.
In fact I searched the pdf for the string "area 0" and found no match.
Regards,
Ahsan
Andy <and123and@googlemail.com> wrote:
Hi Ahsan
You are right in saying that one area has to have a touchdown in area 0,
in this lab if you read ahead to Task 4.6 it asks you to put lo0 in area 0
on R1. This would have allowed you to config virtual links, the "brains"
also suggest that this is one reason to read the entire lab before starting.
hth
-A
On 18/03/2008, Ahsan Mohiuddin <ahsan.mohiuddin@yahoo.com> wrote: Hello
Group,
in subject task, we have three ospf areas 17, 135, 34, with ABRs sitting
between (17, 135) and (135,34).
The task states: "Without regard to network redundancy, use the minimal
number of virtual links needed to support this OSPF domain." If I am not
mistaken, its asking me to attain reachability across the entire ospf
domain.
The solution guide shows a virtual link between the aforementioned ABRs.
However, when I LABed it, the virtual link never comes up. I remember
reading somewhere that at least 1 ABR has to be in Area 0, but in this case
there IS no area 0.
My Solution? Multipoint GRE tunnel between the ABRs (actually the ABRs sit
on a common NBMA net with a third ospf router.. all three of them in area
135, hence the multipoint tunnel) Apparently, it works.
I still don't know whether virtual-links could have been used instead, and
perhaps in a more clean way. Any ideas?
Regards,
Ahsan
---------------------------------
Looking for last minute shopping deals? Find them fast with Yahoo! Search.
This archive was generated by hypermail 2.1.4 : Tue Apr 01 2008 - 07:53:53 ART