nanog mailing list archives
Re: Load balancing in routers
From: Mark Kent <mark () noc mainstreet net>
Date: Mon, 8 Apr 2002 11:02:11 -0700 (PDT)
load balancing over multiple links uses a flow-hashed method. If you want per-packet load distribution you have to specifically enable it by saying "no ip route-cache" on each interface.That is very deadly, please, don't anyone actually try that.
How so? So it uses a little more cpu, but that may not be relevant in a lot of applications (like down at the T1 level). I've had a customer on the end of 8 T1, no ip route cache, on a 4700 (their end) and a 7206/300 (my end). 4700 runs a little hot, but survives. Similarly, I currently have a couple of 4*T1, a 3*T1, and several 2*T1 on PA-MC-T3 ports on a 7206/300 with no issues whatsoever. Max cpu usage is 35%. Everything works. Now, contrast that with my first use of cef, this was back when the only cef configuration was "ip cef" or something similar. Very difficult to screw things up when the config is a one-liner, and yet when I turned this on the 7206 immediately crashed. -mark
Current thread:
- Re: Load balancing in routers, (continued)
- Re: Load balancing in routers jeffrey arnold (Apr 07)
- Re: Load balancing in routers Eric Osborne (Apr 08)
- Re: Load balancing in routers Iljitsch van Beijnum (Apr 08)
- Re: Load balancing in routers Lincoln Dale (Apr 08)
- Re: Load balancing in routers Paul Vixie (Apr 08)
- Re: Load balancing in routers Iljitsch van Beijnum (Apr 08)
- Re: Load balancing in routers joe mcguckin (Apr 08)
- Re: Load balancing in routers Stephen Sprunk (Apr 08)
- Re: Load balancing in routers Alex Rubenstein (Apr 08)
- Re: Load balancing in routers Richard A Steenbergen (Apr 08)
- Re: Load balancing in routers Mark Kent (Apr 08)
- Re: Load balancing in routers Stephen J. Wilcox (Apr 08)
- Re: Load balancing in routers Mark Kent (Apr 08)
- Re: Load balancing in routers Stephen Sprunk (Apr 08)
- Re: Load balancing in routers Richard A Steenbergen (Apr 08)
- Re: Load balancing in routers Rodney Dunn (Apr 08)
- Re: Load balancing in routers Donn Lasher (Apr 08)
- packet reordering at exchange points Paul Vixie (Apr 08)
- Re: packet reordering at exchange points Sean Donelan (Apr 08)
- Re: packet reordering at exchange points Richard A Steenbergen (Apr 08)
- Re: packet reordering at exchange points Jake Khuon (Apr 08)