[127703] in North American Network Operators' Group
Re: Rate Limiting on Cisco Router
daemon@ATHENA.MIT.EDU (Jack Bates)
Fri Jul 9 01:54:11 2010
Date: Fri, 09 Jul 2010 00:50:19 -0500
From: Jack Bates <jbates@brightok.net>
To: Mikael Abrahamsson <swmike@swm.pp.se>
In-Reply-To: <alpine.DEB.1.10.1007090609280.23489@uplift.swm.pp.se>
Cc: nanog@nanog.org, "Murphy, Jay, DOH" <Jay.Murphy@state.nm.us>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Mikael Abrahamsson wrote:
>
> With a G1 you'll be able to shape just fine, even do fancy stuff like
> fair-queue within those 80 megs. I've done this on a NPE-300, but only
> egress, and as long as packet sizes were fairly large (normal TCP
> sessions with mostly 1500 byte packets + ACKs) it coped with 90 megs of
> traffic. So with the added power of G1 you should definitely try before
> ruling it out.
>
Definitely worth the try. Your biggest enemy may be 12.4 IOS. It's
bloated and buggy in my experience, but that has mostly been edge
services. If 12.4 pegs your processor, you may want to check the
software/hardware matrix and see if one of the older 12.0/2 service
provider trains that they continued to add support for (probably some
large customer's special requests). I don't know if it will support the
G1, but if so, you might have better performance out of it.
> Shaping is so much better than the packet dropping that a rate limiter
> does.
>
Definitely. My favorite off the wall use of shaping was to smooth
traffic flow on a Gig-e to reduce microbursts from overrunning the
hardware rx on a 7513. :)
Jack
