From: Bajo (bajoalex@gmail.com)
Date: Fri Jan 28 2005 - 17:52:23 GMT-3
Agree with Michael. You can not redistribute from one to the other
because they never formed neighborhood relationship (are ID
mis-match). Your choice are tunnel or virtual interface..
On Fri, 28 Jan 2005 15:05:33 -0500, Michael A. Gulla
<michael.gulla@ionetcon.com> wrote:
> 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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-- Regards,Bajo
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