From: Balaji Siva (bsivasub@gmail.com)
Date: Sat Jan 29 2005 - 17:36:23 GMT-3
To answer jellyboy,
Others can chime in if i am way off-base here...
The case of redistributing in the solution you described, R1 is really
an ASBR. R1 is redistribuing an another routing protocol (in this
case, it is OSPF) into area 15. So it is not the same backbone area
as the one on the left on R1.
The scneario you tried doesn't work becoz, your OSPF 15 connects to
another area - area 1 in R5 but that domain (area 1 and area 15)
doesn't have backbone area zero to talk to. The area 0 of process 1
on R1 is does not belong to the OSPF domain/AS of R1.
So, the solution proposed by others to use GRE is probably the right one.
Thanks
Balaji
On Fri, 28 Jan 2005 14:52:23 -0600, Bajo <bajoalex@gmail.com> wrote:
> 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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