Vincent- this is a textbook scenario for virtual links to Area 0. You must
realize that you will be building a 1 way LSA tunnel (configured on both
sides). How you look @ this, is that Router C is broke. It can't inform
Area 4 because it's not an ABR. You need to make the connection "from &
through" Area 1 to Area 0's, pointed @ the OSPF router ID of Router B (vise
versa with the other side's config). Keep in mind that you are traversing
Area 1 & Area 4 does not need configuring. The commands are pretty simple &
again must be carried out on both sides (Routers B & C). When you have
built the Virtual Link, Router C will have "theoretically" Area 0 under the
hood. This is what allows Area 4 to work, it will be touching Area 0 now.
You will notice when you are done, Router C now looks @ Area 0 as "O" & not
"IA." As far as your authentication question... this has nothing to do
with your problem. Authentication locks down Area by Area, so that routes/
LSA's are only permitted to Athenticat-able OSPF routers or routers in other
Areas that obtain updates outside the Authenticated Area. In short,
Authentication stops someone from plugging in a router within your
Authenticated Area & picking up LSA info.
All the best !!!
Phil
----- Original Message -----
From: Vincent Chong
To:
Sent: Friday, May 04, 2001 3:53 AM
Subject: OSPF virtual link Question [7:3154]
> Hi;
>
> The following scenario
>
>
> [RouteA area0][area0 RouterB area1] RouterC area4]
> |
> |
> |
> |
> |______________Virtual link_______________________|
>
> Does this topology is valid in OSPF?
>
> I belive that the configuration has topology error, but the owener
> said it was
> working fine without authenication.
>
> For I am not familiar with Virtual link, ay comment are welcome?
>
> Best Rgds;
> Vincent Chong
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