From: Joseph Rinehart (jjrinehart@hotmail.com)
Date: Tue Dec 14 2004 - 04:16:11 GMT-3
Of course you can always tie them together with GRE tunnels. Not that
anyone woudl really want to do this in a real life network....
----- Original Message -----
From: "Brian Dennis" <bdennis@internetworkexpert.com>
To: "Hans None" <acsyao@hotmail.com>; <ccielab@groupstudy.com>
Sent: Monday, December 13, 2004 8:25 PM
Subject: RE: ospf discontinuous areas
> Short answer, yes it will work properly. The only problem you may run
> into is with area summarization (i.e. two area 1's summarizing the same
> address space).
>
> Long answer, see RFC 2328
> (http://www.internetworkexpert.com/rfc/rfc2328.txt)
>
> <QUOTE>
> 3.7. Partitions of areas
>
> OSPF does not actively attempt to repair area partitions. When
> an area becomes partitioned, each component simply becomes a
> separate area. The backbone then performs routing between the
> new areas. Some destinations reachable via intra-area routing
> before the partition will now require inter-area routing.
>
> However, in order to maintain full routing after the partition,
> an address range must not be split across multiple components of
> the area partition. Also, the backbone itself must not
> partition. If it does, parts of the Autonomous System will
> become unreachable. Backbone partitions can be repaired by
> configuring virtual links (see Section 15).
>
> Another way to think about area partitions is to look at the
> Autonomous System graph that was introduced in Section 2. Area
> IDs can be viewed as colors for the graph's edges.[1] Each edge
>
> of the graph connects to a network, or is itself a point-to-
> point network. In either case, the edge is colored with the
> network's Area ID.
>
> A group of edges, all having the same color, and interconnected
> by vertices, represents an area. If the topology of the
> Autonomous System is intact, the graph will have several regions
> of color, each color being a distinct Area ID.
>
> When the AS topology changes, one of the areas may become
> partitioned. The graph of the AS will then have multiple
> regions of the same color (Area ID). The routing in the
> Autonomous System will continue to function as long as these
> regions of same color are connected by the single backbone
> region.
> </QUOTE>
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Hans None
> Sent: Monday, December 13, 2004 8:10 PM
> To: ccielab@groupstudy.com
> Subject: ospf discontinuous areas
>
> All,
>
>
>
> Can ospf discontinuous areas work properly (non area 0).
>
>
> For example, there are multiple area 1 which are discontinuous to each
> other. Will this work properly?
>
>
> Thanks,
>
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