RE: OSPF Virtual Links

Without additional information on the lab I would also state that maybe the
question was not looking for virtual-links.

If the routes originate in area 5 that is where the summary needs to be
created towards area 0. If one OSPF process is used. But maybe the solution
is to create two processes. Redistribute between the processes on R3 and use
the summary command for external routes on R3 for redistribution into Area
3. At that point as it is a single area 3 in the second process you don't
need an area 0. And you have met the requirement of summarizing on R3.

Just a thought.

Regards,
 
Tyson Scott - CCIE #13513 R&S, Security, and SP
Managing Partner / Sr. Instructor - IPexpert, Inc.
Mailto: tscott_at_ipexpert.com

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Bob
Sinclair
Sent: Tuesday, June 22, 2010 7:05 PM
To: cgrammer_at_essilorusa.com; 'Cisco certification'
Subject: RE: OSPF Virtual Links

Quick thought: If they are area 5 routes, then shouldn't the summary
command be "area 5 range..." I believe the command references the source
area.

HTH,

-Bob Sinclair

> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> cgrammer_at_essilorusa.com
> Sent: Tuesday, June 22, 2010 6:52 PM
> To: ccielab_at_groupstudy.com
> Subject: OSPF Virtual Links
>
> I am having a difficult time finding information regarding a detailed
> explanation of OSPF virtual links with regards to route summarization
> on the
> remote end of the virtual link router.
>
> I am working on a practice lab that:
>
> (area5) R1 --(area0)--- R2 ----(area1) ---R3 ---(area3) --- R4
>
> The requirement is to connect R2 to R3 with a virtual link to allow
> area5
> routes to be propagated to R4.
> 1.1.0.0/24
> 1.1.1.0/24
> 1.1.2.0/24
> 1.1.3.0/24
>
> The routes show up on R4 as expected, but the next requirement is to
> summarize
> the routes at R3 so that it shows up as 1.1.0.0/22 on R4.
>
> Since R3 is now a member of Area0, I would think i can use
> area 0 range 1.1.0.0 255.255.252.0
>
> But,this doesn't work.
> It seems that there are some peculiar characteristics regarding virtual
> links
> and area 0, but there isn't much documentation outside of the
> rudimentary
> explanation and troubleshooting commands.
>
> Thanks in advance for everyones help,
>
>
> Chris
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.829 / Virus Database: 271.1.1/2955 - Release Date:
> 06/22/10 14:36:00

Blogs and organic groups at http://www.ccie.net
Received on Tue Jun 22 2010 - 19:40:17 ART