[68525] in North American Network Operators' Group
Re: Load Balancing Multiple DS3s (outgoing) on a 7500
daemon@ATHENA.MIT.EDU (Will Yardley)
Sat Mar 13 19:20:14 2004
Date: Sat, 13 Mar 2004 16:19:40 -0800
From: Will Yardley <william+nanog@hq.dreamhost.com>
To: NANOG <nanog@merit.edu>
Mail-Followup-To: NANOG <nanog@merit.edu>
In-Reply-To: <203AE98E-74A8-11D8-85DE-00039312C852@isc.org>
Errors-To: owner-nanog-outgoing@merit.edu
On Fri, Mar 12, 2004 at 11:37:25PM -0500, Joe Abley wrote:
> On 12 Mar 2004, at 23:24, joe mcguckin wrote:
>
> > I suspect that each FE goes to a different AS...
>
> In that case, sample/count outbound traffic volumes by
> (prefix/AS/AS_PATH/something), sort the resulting list, and develop an
> import policy based on the top N entries which shares the traffic by
> tweaking some other attribute to avoid the last-resort tie-break.
The tool "ehnt" is pretty useful for generating a "top" style list of
ASes in order of the amount of traffic you're sending their way.
By the way, w/r/t to the tiebreaker stuff, note that (on Cisco devices)
if you don't have "bgp bestpath compare-routerid" set, the route that
was received first will be preferred. This minimizes route-flap, but can
cause weird shifts in your traffic patterns when one bgp session or
another goes down (credit goes to Mark Nagel for figuring out this one
for me).
--
"Since when is skepticism un-American?
Dissent's not treason but they talk like it's the same..."
(Sleater-Kinney - "Combat Rock")
