Re: OSPFv2 inter-area transit - fundamental concept

From: WorkerBee (ciscobee@gmail.com)
Date: Thu Oct 05 2006 - 11:14:57 ART


Hi Scott,

How does it work if I have the following setup where R2 is the ABR
without Area 0?

[R1]----(area 10)-------[R2]------(area 20)-----[R3]

Without Area 0 define in any of R2 interface, R1 and R3 cannot
communicate with each other. "no capability transit" at R2 does not
help.

Can you shine some light? :)

On 10/5/06, Scott Morris <swm@emanon.com> wrote:
> OSPFv2 actually allowed a workaround called a transit area, where ospf will
> calculate the truly shortest path. You can turn this off with "no
> capability transit" if you wish.
>
> :)
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
> #153, CISSP, et al.
> CCSI/JNCI-M/JNCI-J
> IPExpert VP - Curriculum Development
> IPExpert Sr. Technical Instructor
> smorris@ipexpert.com
> http://www.ipexpert.com
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Leo
> Boulton
> Sent: Thursday, October 05, 2006 9:01 AM
> To: Cisco certification
> Subject: OSPFv2 inter-area transit - fundamental concept
>
> Hi, and thanks:
>
> Simple question: Is it a restriction of OSPF that all inter-area traffic
> must flow through the backbone area? What if I have two non-backbone areas
> next to each other, does the traffic need to go to the backbone and then to
> the other area? I was always under the impression that this was not a
> requirement of OSPF.
>
> Thanks,
>
> -LB
>
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