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
>> >
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>> >
>> >
>> >
>> >
>> >
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Received on Tue Jun 22 2010 - 18:54:56 ART