Re: OSPF Virtual Links

To possibly build off what Tyson has said... Are those loopbacks on R5? Can you redistribute connected, route-map, matching those interfaces then on R3, summarize the external routes?

Sent from my iPad

On Jun 22, 2010, at 7:54 PM, "Grammer, Christopher" <cgrammer_at_essilorusa.com> wrote:

> 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 - 20:04:40 ART