On Tue, 23 Sep 2008, Paul Stewart wrote:
We have a couple of customers that are looking to purchase an Internet
connection from us - this will be a BGP feed to each customer as they are
multihomed today etc.
Normally, we would just supply a full table and let them decide what to do
with it. In this scenario, they both wish to use us as a backup provider
and wish to ONLY use our network if their primary provider (Cogent) is down.
I wouldn't call this conditional BGP. We have a few customers doing this,
and in most cases they do this because they don't have big enough routers
to handle multiple full bgp tables.
The typical setup is to use route-maps to set localpref on received routes
(making the primary provider's route(s) preferred) and on sent routes to
do several prepends to make the backup path less preferable to the
internet. In such a setup, the customer probably doesn't need more than
default routes from each provider.
----------------------------------------------------------------------
Jon Lewis | I route
Senior Network Engineer | therefore you are
Atlantic Net |
_________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
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