From: Michael A. Gulla (michael.gulla@ionetcon.com)
Date: Fri Jan 28 2005 - 17:05:33 GMT-3
You can use a GRE Tunnel between the two areas if you can not use virtual
links
Mike
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
jellyboy
Sent: Friday, January 28, 2005 2:02 PM
To: ccielab@groupstudy.com
Subject: Two discontinuous OSPF backbones
Hi all,
Got a scenario where two discontinuous ospf backbone areas are joined
by area 15.
Area0<R5>Area15<R1>Area0
Normally I would configure a virtual-link between the two Area0s.
However the problem states that the virtual-link command can not be
used. Their solution was to have two ospf processes running on R1 and
redistribute between them.
router ospf 1
log-adjacency-changes
redistribute ospf 15 subnets
network 172.16.124.0 0.0.0.7 area 0
network 192.168.1.1 0.0.0.0 area 0
!
router ospf 15
log-adjacency-changes
redistribute ospf 1 subnets
network 172.16.15.0 0.0.0.15 area 15
This solution works, but only if two backbone areas are bounded by
another area, area 15 in this case.
My questions are :
1) Does this mutual redistribute solution only work between
discontinuous backbone areas??
Reason is I tried this by replacing the R5 area 0 by an area 1:
Area1<R5>Area15<R1>Area0
This gave the dreaded:
01:05:31: %OSPF-4-ERRRCV: Received invalid packet: mismatch area ID, from
backbo
ne area must be virtual-link but not found from 172.16.136.3, Ethernet0
So I guess it does not work but I would like confirmatiom, comments etc.
2) Are there any other solutions lurking out there for this type of
topology that I should be make aware of?
TIA
jellyboy
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