Re: EIGRP Site of Origin

There is a nice explanation in pages 220 - 226 in "Cisco Press MPLS
Fundamentals".

I guess that this would be a good candidate to lab up. From reading
the above pages it looks like the recommendation is to configure SOO
on the PE routers and the not backdoor CE routers.

-Rich

On Tue, Jan 4, 2011 at 5:15 PM, Joseph L. Brunner
<joe_at_affirmedsystems.com> wrote:
> Is this a lab?
>
> I have never seen a real network designed/implemented this way.
>
> Please advise
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Malik Nouman Ahmad
> Sent: Tuesday, January 04, 2011 3:51 PM
> To: Cisco certification
> Subject: EIGRP Site of Origin
>
> Hi,
>
> Suppose the connectivity is CE1 <->PE1 <-> PE2 <->CE2 and that CE1 and CE2
> have a backdoor link. The PE-CE routing protocol is EIGRP. Now if we
> configure same SoO community on both CE2 and PE1 using "ip vrf sitemap
> <name>", then PE1 should automatically reject the updates coming through the
> backdoor link
>
> My question is that what will happen if the main VPN link between PE1 and
> PE2 goes down.
>
>
> - Will PE1 be still rejecting the updates from CE2? If so, then when will
> the backdoor link used as the updates always being denied?
> - Will the backdoor link be used only for communication between CE1 & CE2
> (in case of VPN failure) and the reason of SoO community is to block the
> traffic arriving from any other CE (say CE3) which is connected to PE1 and
> is trying to reach CE2?
>
> Please clarify
>
> Thanks,
> Malik
>
>
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Received on Wed Jan 05 2011 - 17:24:57 ART