[135223] in North American Network Operators' Group
Re: Dual Homed BGP for failover
daemon@ATHENA.MIT.EDU (Jack Bates)
Tue Jan 18 15:58:18 2011
Date: Tue, 18 Jan 2011 14:57:16 -0600
From: Jack Bates <jbates@brightok.net>
To: George Bonser <gbonser@seven.com>
In-Reply-To: <5A6D953473350C4B9995546AFE9939EE0BC13424@RWC-EX1.corp.seven.com>
Cc: ayousuf0079@gmail.com, nanog group <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 1/18/2011 2:05 PM, George Bonser wrote:
> One can take a full feed but filter so only a subset of the routes are
> actually installed. For example, filter all routes that are more than
> one AS away from the immediate upstream.
>
You should still be careful, as most processors keep a copy of filtered
routes as well, so while your forwarding table may not increase, your
route processor memory most likely will.
I haven't checked, but I presume IOS and Junos have a knob to disable
this feature?
Jack
