The network doesn't totally hose. Basically you get a second backbone.
This leads to basically two different networks. In the example you
provided, The backbone is still "contiguous"
An example or where this might occur would be
__
Area | |-----------
----------|__| C
B |
A | Area 0
_| __
| | | |Area 2
|__|-----------|__|------
D E
If the connectivity on link A went down, Area 0 then becomes divided,
creating 2 separate networks
1) consists of subnet B, C, and possibly A
2) consists of D, E and possibly A
possibly A is determined by what broke the connectivity.
OSPF still functions, it just changes its behavior to accommodate the
new topology.
-----Original Message-----
From: Carroll Kong [mailto:[EMAIL PROTECTED]]
Sent: Friday, June 07, 2002 7:18 AM
To: [EMAIL PROTECTED]
Subject: Re: OSPF area 0 [7:45995]
If I remember correctly, yes, Area 0 routers must always have a way to
connect to each other. It does not have to be a full mesh (if that is
what you mean by contiguous). Three routers in a mesh would be fine if
one link broke.
Now, if an area 0 router loses all connectivity to the other Area 0s (in
your case, isolate one point of the triangle by losing TWO links), then
your network gets borked. You will need a virtual link (if at all
possible), or... well... your network is broken? :)
> Hi group,
>
>
>
> Is there any condition that OSPF area 0 must be contiguous?.
>
> I remembered read this some where on CCO. Is this true?. For a
> situation, three ospf routers connected in a triangle shape, what if
> one of the link goes down?.
>
> Any one experienced on this situation, please show me some documents
> related to this?.
>
>
>
> Thanks in advance,
>
> J.
>
>
>
> ---------------------------------
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> violations to [EMAIL PROTECTED]
-Carroll Kong
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=46051&t=45995
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