From: Tony Grooves (tgrooves@gmail.com)
Date: Wed Aug 06 2008 - 09:44:42 ART
Thank you guys, is clear right now.
Tony
Khawar Butt wrote:
> Hi Tony,
>
> As Shahid said, Virtual Links are a link in Area 0. So, you want all links
> in Area 0 to be authenticated, the Virtual Link is also a part of it. There
> are 2 different ways of doing it.
>
> In your example, you have Area 0 connected to Area 5 and Area 5 connected to
> Area 2. Let's assume R1 is the ABR connecting Area 0 and Area 5 and R2 is
> the router connecting Area 5 and Area 2.
>
> Option 1
>
> R1
>
> Router OSPF 1
> Area 5 virtual-link 2.2.2.2 authentication message-digest
> Area 5 virtual-link 2.2.2.2 message-digest-key 1 MD5 cisco
> (Assuming that 2.2.2.2 is the router-id of R2)
>
> R2
>
> Router OSPF 1
> Area 5 virtual-link 1.1.1.1 authentication message-digest
> Area 5 virtual-link 1.1.1.1 message-digest-key 1 MD5 cisco
>
> (Assuming that 1.1.1.1 is the router-id of R1)
>
> Option 2
>
> R1
>
> Router OSPF 1
> Area 0 authentication message-digest
> Area 5 virtual-link 2.2.2.2 message-digest-key 1 MD5 cisco
> (Assuming that 2.2.2.2 is the router-id of R2)
>
> R2
>
> Router OSPF 1
> Area 0 authentication message-digest
> Area 5 virtual-link 1.1.1.1 message-digest-key 1 MD5 cisco
>
> (Assuming that 1.1.1.1 is the router-id of R1)
>
> Although R2 is not physically connected to Area 0, it is logically connected
> via the Virtual Link.
>
>
> Hope this helps.
>
> Khawar Butt
> CCIE#12353 (R/S , Security , SP , Voice)
> http://www.khawarb.com
> http://www.netmetric-solutions.com
> E-mail : khawarb@khawarb.com
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Shahid Ansari
> Sent: Wednesday, August 06, 2008 8:26 PM
> To: Tony Grooves
> Cc: Cisco certification
> Subject: Re: Area 0 and Virtual links authenticated.
>
> In Short ,A virtual link is really an extension of Area 0, and if Area 0
> is running link authentication, the virtual link must be configured for it
> as well.
>
> If you go through Internetwork expert Workbook R/S labs will clarify lots of
> things.
>
>
>
> Shahid Ansari
>
>
> On Wed, Aug 6, 2008 at 3:08 PM, Tony Grooves <tgrooves@gmail.com> wrote:
>
>
>> Hi guys.
>>
>> I have a concern about authentication with area 0 and virtual links.
>> If the task ask to configure Area 0 authenticated and you have it
>>
> separeted
>
>> with area 5 in the middle.
>> Will you consider virtual links as part of area 0 and also configure the
>> same method of authentication on them?
>>
>> Also what about if you have area 0, area 5 and area 2 in this order, will
>> you authenticate the virtual links between the ABRs?
>>
>> Thanks a lot for any help on this.
>>
>> Tony.
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
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>
>
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