Hey Chuck...... I just thought of something......... you only need 2
routers to have 3 OSPF Areas.... in your diagram you show a router "inside"
each OSPF area, however, OSPF routers (at least in my understanding and most
Cisco Press book diagrams) are either totally inside an area (all interfaces
inside a single Area, although they may connect elsewhere using other
routing protocols, we're only considering OSPF) or sit on the edge of
multiple areas (ABRs). Having said that, I would think the problem now
becomes one like this: (please excuse my ASCII drawing skills =)
________ ________ ________
| Area 0 | | Area 1 | | Area 2 |
| R1 R2 |
| _______| |________| |_______|
The Virtual Link is now between R2 and R1. In this "new" scenario, there is
no issue about where the traffic destined for Area 1 goes (it goes to R1).
Can you further explain the scenario you speak of with 3 OSPF Areas with a
router in each Area? That sounds more like a BGP thing where a router is
"inside" an AS but can connect to routers in other ASes (via eBGP) without
being part of the other AS.
Mike W.
"Chuck Larrieu" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Ever wonder what the CCIE candidates talk about on the CCIE list?
>
> The following message came through today. I thought the bright folks on
this
> list might be curious, and might want to venture an answer.
>
> Begin original question:
>
> Guys,
>
> I wonder if there is anybody who remembers the discussion on Virtual
> Links in OSPF. It was posted some time ago but I can't seem to find it.
>
> The scenario was something like this:
> ________ _______ _______
> |Area 0 | |Area1| |Area2|
> | R0 |--| R1 |--| R2 |
> |______| |_____| |_____|
>
> There is a virtual link from area 2 to Area 0 via Area1. Traffic needs to
> get to R1 in Area 1 from R2 in Area 2. Assume that the virtual link has to
> use R1 (To create the V.Link). Does the traffic flow passed R1 (in Area 1)
> to Area 0 and then back to area 1, or does the actual flow just to R1 from
> R2.
>
> I cant remember the conclusion, and I cant seem to find it on the
archives.
> Quite interesting issues.
>
> End of original question
>
>
> Chuck
>
> One IOS to forward them all.
> One IOS to find them.
> One IOS to summarize them all
> And in the routing table bind them.
>
> -JRR Chambers-
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