Chuck,
Is that what set off the great "Virtual link" thread, which I might add, has
become quite heated? I was just skimming the list for the past couple of
days,
so I didn't really catch the beginning.
I'm not sure it's been resolved yet, but I know the answer to the question if
that's of any interest.
It's kind of a trick question...
In OSPF, traffic between two non-zero areas (such as area1 and area2 in the
diagram below) must traverse the backbone, area0. This is a special
circumstance though, because router2 is virtually linked to area0, since it
doesn't have a direct connection.
The end result is that traffic between areas 1 and 2 does pass through area0,
but not in the way most people think. R2 is a backbone router, by virtue of
it's virtual link, so it may pass traffic between areas1 and 2 directly.
This
does not break any rules, and is in fact a desired behavior.
Alan
----- Original Message -----
From: "Chuck Larrieu"
To:
Sent: Sunday, May 27, 2001 8:59 PM
Subject: Wanna Be a CCIE? Try This One [7:6076]
> 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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http://www.groupstudy.com/list/cisco.html
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