RE: EIGRP Backdoor

If you want to learn the routes in the backdoor link then increase the delay
on the CE link facing towards the PE. Changing the seed metric for EIGRP to
VPNv4 BGP redistribution isn't going to affect anything, since the metrics
from the EIGRP database are automatically copied in and overwrite whatever
seed metric you set.

The only time the seed metric matters is if the individual EIGRP vector
metrics didn't get encoded in the VPNv4 update. This could happen because you
have EIGRP on one side but a different protocol on the other side, if you do
some sort of Inter-AS routing exchange that strips the extended communities
that encoded the EIGRP vector metrics (e.g. Inter-AS Option A with IPv4
Unicast EBGP as the PE to PE routing protocol) , or if you're running an older
IOS version that didn't support the encoding to begin with.

If you "show bgp vpnv4 unicast all x.y.w.z/len" on the PE router doing the
redistribution you can see in the VPNv4 update what metrics have been set.

Brian McGahan, 4 x CCIE #8593 (R&S/SP/SC/DC), CCDE #2013::13
bmcgahan_at_INE.com<mailto:bmcgahan_at_INE.com>

Internetwork Expert, Inc.
http://www.INE.com<http://www.ine.com/>

From: Mohammad Khalil [mailto:eng_mssk_at_hotmail.com]
Sent: Tuesday, November 26, 2013 12:56 PM
To: Brian McGahan; ccielab_at_groupstudy.com
Subject: RE: EIGRP Backdoor

OK if i wanted the routes to be learned through the backbone in this case what
should i do? Increase the delay on the backdoor or should i change the eigrp
seed metric when redistribution?
Thanks

> From: bmcgahan_at_ine.com<mailto:bmcgahan_at_ine.com>
> To: eng_mssk_at_hotmail.com<mailto:eng_mssk_at_hotmail.com>;
ccielab_at_groupstudy.com<mailto:ccielab_at_groupstudy.com>
> Date: Tue, 26 Nov 2013 10:04:38 -0600
> Subject: RE: EIGRP Backdoor
>
> That's normal. Your metric of 1 1 1 1 1 doesn't apply because the EIGRP
metric is automatically encoded into the VPNv4 BGP update, and then copied
back into EIGRP when you redistribute it back on the other side. The SoO is
normal too. By using the same value on the PE-CE links you're basically
filtering those routes out.
>
> Brian McGahan, 4 x CCIE #8593 (R&S/SP/SC/DC), CCDE #2013::13
> bmcgahan_at_INE.com<mailto:bmcgahan_at_INE.com>
>
> Internetwork Expert, Inc.
> http://www.INE.com
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com<mailto:nobody_at_groupstudy.com>
[mailto:nobody_at_groupstudy.com] On Behalf Of Mohammad Khalil
> Sent: Tuesday, November 26, 2013 5:02 AM
> To: ccielab_at_groupstudy.com<mailto:ccielab_at_groupstudy.com>
> Subject: EIGRP Backdoor
>
> Hi All
> I have the below topology
> R1 -- R2
> | |
> R3 -- R4
>
> All connections are FE except for the backdoor which is serial I have
configured EIGRP as the PE-CE routing protocol between PE and CE (my PEs are
R1 and R2) When I redistributed BGP into EIGRP I used a metric of 1 1 1 1 1 I
see routes of My CEs through the MPLS backbone When I configured soo through
the route-map and applied the ip vrf sitemap on the PE-CE interface , I see
the routes now through the backdoor link , is that what suppose to happen or
am missing something ?
>
> Thanks
>
>
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Received on Tue Nov 26 2013 - 17:10:49 ART