From: Bhuiyan Muhaimeen (levanto@gmail.com)
Date: Sun Oct 19 2008 - 01:38:04 ARST
Hi Omkar,
Not too sure what your confusion is about. I don't have the SN workbook, but
from
what you describe, the issue here would exactly be that you need to
configure
a virtual link. This type of question wants to make sure that you understand
the
requirements like, "Make sure all area 0 adjacencies are authenticated" or
"Make sure all OSPF area 0 links are authenticated".
So of course you'd need virtual links here. And I bet, somewhere down in
this lab
you'd find requirements like the above. This is just to make sure that you
understand
that virtual link _is_ an area 0 link and you must authenticate over the
virtual link,
Otherwise your network is _not_ protected. (and you have also not fulfilled
the
requirement!)
HTH!
-Bhuiyan Muhaimeen
CCIE # 21880 (R&S)
On Sat, Oct 18, 2008 at 4:27 PM, Omkar Tambalkar <omkar.groupstudy@gmail.com
> wrote:
> I am confused in OSPF lab 2 for Authentication.
>
> The way initial configuraton gets done, the ABR of area 2 is not connected
> to area 0 directly but is connected to area 1. Area 1 has another ABR that
> is connected to Area 0. Obviously other routers in area 2 cannot receive
> routes from areas except area 2 and vice versa unless virtual link is
> created by using area 1 as transit area.
>
> The task is to to ensure that all routers in the OSPF domain have
> reachability to the advertised networks in OSPF. Without specifics, should
> I
> just configure the virtual link to obtain reachability or there is a typo
> in
> describing initial configuration such that area 0 should really replace
> area
> 1 in the topology so that it is in the backbone?
>
> R1--------area 2------------R2
> |
> |
> area 1
> |
> |
> R4--------area 0------------R3
>
> - Later,
> Omkar
>
>
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