From: Jay Hennigan (jay@west.net)
Date: Tue Feb 18 2003 - 18:43:24 GMT-3
Georg Pauwen wrote:
> Mark is right, you can designate any other area as the backbone area. I
> configured a hub router with area 1 and two spoke routers with area 2 and 3,
> with each spoke a link to area 1. Works 100% ok, full routing table, full
> reachability.
Because your "backbone" area 1 was a single router, it would have both of
the adjacent areas in its routing table and thus be capable of full
reachability.
You may not have success with two or more area 1 routers each of which is
an ABR with another non-zero area, especially in a pure OSPF environment.
I haven't tried this in a lab scenario, and it may even work for Cisco
gear but it isn't RFC-compliant. Per RFC2328:
* The OSPF backbone is the special OSPF area responsible for disseminating
inter-area routing information.
* Area ID
A 32-bit number identifying the area. The Area ID of 0.0.0.0 is
reserved for the backbone.
This is pretty well spelled out in RFC2328 and its predecessors. Pay
particular attention to sections 3 and 6.
-- Jay Hennigan - CCIE #7880 - Network Administration - jay@west.net NetLojix Communications, Inc. - http://www.netlojix.com/ WestNet: Connecting you to the planet. 805 884-6323
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