Re: OSPF Virtual Links

Make sure that the routes are advertised in that given area before
summarizing.

On Wed, Jun 23, 2010 at 7:03 AM, Tyson Scott <tscott_at_ipexpert.com> wrote:

> My only other thought after thinking about it a bit is if you had another
> router connected to Area5. One did a summary and the other the more
> specific routes. You could then filter the more specific routes on R3 with
> a distribute list and let the summary go thru. Still a need for a
> difference in the topology.
>
>
>
> Regards,
>
>
>
> Tyson Scott - CCIE #13513 R&S, Security, and SP
>
> Managing Partner / Sr. Instructor - IPexpert, Inc.
>
> Mailto: <mailto:tscott_at_ipexpert.com> tscott_at_ipexpert.com
>
>
>
>
>
> From: Grammer, Christopher [mailto:cgrammer_at_essilorusa.com]
> Sent: Tuesday, June 22, 2010 7:55 PM
> To: Tyson Scott
> Cc: Bob Sinclair; Cisco certification
> Subject: Re: OSPF Virtual Links
>
>
>
> So to finish this question:
>
>
>
> If the scenario is changed a bit to look like this:
>
>
>
> (area5) R1 --(Area0)-- R2 --(Area0) -- R3 -- (Area 3)
>
>
>
> There is no way to summarize routes at R3 that originated from area 5?
>
> --Except for the multiple process redistribution--
>
>
>
> This sounds wrong...but I haven't been able to find a way.
>
>
>
>
>
>
>
>
>
>
>
> On Tue, Jun 22, 2010 at 6:47 PM, Grammer, Christopher
> <cgrammer_at_essilorusa.com> wrote:
>
> I like it :)
>
>
>
> On Tue, Jun 22, 2010 at 6:40 PM, Tyson Scott <tscott_at_ipexpert.com> wrote:
>
> 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
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>

-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
Sr. Technical Instructor
YES! We take Cisco Learning Credits!
Training And Remote Racks available
Blogs and organic groups at http://www.ccie.net