From: OhioHondo (ohiohondo@columbus.rr.com)
Date: Wed Jun 11 2003 - 21:18:32 GMT-3
Sharma
Let's say that both Area 2 routers are ABR's.
(This means Area 0 is extended to both ARea 2 routers.)
Try using an area range command on both Area 2 routers.
Make a range command that summarizes all prefixes in both Area 2's.
Then when your Area 2 link fails:
Area 0 will receive a summarized (from range commands) from both Area 2's.
If there are different OSPF costs, only 1 will be in the IP routing table.
Access to one of your ARea 2's will be lost!!!
If the OSPF costs are equal, you will have intermittant connectivity to both
ARea 2's.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
SHARMA,MOHIT (HP-Germany,ex1)
Sent: Wednesday, June 11, 2003 4:38 PM
To: 'Group'
Subject: OSPF partitioning issue
Hi all,
In the following scenario-
Area0---------Area2
\ |
\ |
\ |
\ |
Area2
If the link between Area2 fails, it becomes discontiguos, this makes the
intra area routes to be shown as inter area routes in both the area 2
routers, I tested this in the lab and found no visible reachability issues.
Does this disconinuity create any hidden problems?
The other question is, that if we need to repair this, can i use a virtual
link between Aree2 to Area 0 and then to Area 2
or should I use a tunnel interface on each router putting them into area 2??
I actually tried it using tunnel but was not able to make it work , as I was
still seeing some of the Area 2 routes as O IA routes.
Thanks as always for your inputs.
Smiles,
Mohit.
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