From: Sean C (Upp_and_Upp@hotmail.com)
Date: Tue Aug 16 2005 - 18:43:53 GMT-3
Hi Leigh,
Yes, I actually implemented the BGP backdoor in a customer solution where
they had multiple sites connected by both Frame-relay and Satellite. Over
frame (the primary connection), they ran EIGRP. Over satellite, they went
through an ISP, which supplied the customer a BGP confederation with each
site using a different AS.
With EIGRP being the primary routing protocol, it was necessary to use the
backdoor command since the AD of internal EIGRP is higher than eBGP's AD.
This way, the HQ had 2 different paths to the remotes - 1 via EIGRP on the
frame, 1 via BGP and satellite. If the frame went down, HQ had the BGP
prefix ready to go. Was there other ways to do the same thing? Yes, but
this is what was implemented with success.
This is a very simplistic explanation but I hope explains the use of the
backdoor command.
I know when I first read about the command, I too was stumped by it's use.
Never thought I'd use it in a real-life scenario. HTH,
Sean
----- Original Message -----
From: "Leigh Harrison" <leigh.harrison@azzu.co.uk>
To: <ccielab@groupstudy.com>
Sent: Tuesday, August 16, 2005 5:18 PM
Subject: BGP Backdoor
> All,
>
> Is anybody actually using the bgp backdoor command in any real
> situations ? Has anybody implemented it in the past ?
>
> I know what it's for, but I'm struggling to see why it would be used !
>
> LH
>
>
> Leigh Harrison
> Technical Consultant
> Azzurri Communications
> Castleton Mill,
> Castleton Close,
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>
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