nanog mailing list archives
Re: Split flows across Domains
From: Robert E.Seastrom <rs () seastrom com>
Date: Tue, 24 Jan 2006 12:07:34 -0500
"Christopher L. Morrow" <christopher.morrow () verizonbusiness com> writes:
On Tue, 24 Jan 2006, Robert E.Seastrom wrote:Glen Kent <glen.kent () gmail com> writes:For example, an ISP can learn two different equal cost routes to a foo.com server via two different autonomous domains. It can thus split different flows (based on src-dest IP, src-dest Port, TOS, etc) across these two paths. Do operators currently do this? Folks can send me replies offline in case this constitues a "trade secret"!Works great with a flow-based router (or layer-three-switch-pronounced- 'crippled-router'). The downside, of course, is that you now have a flow-based router in your network, which has been shown to Not Work Well under other specified conditions (worm outbreaks come immediately to mind).I could be mistaken, but this is also a feature in mbgp, effectively loadsharing across two external paths. I presume the paths would have to be completely equal all the way down to the router-id and (probably) age-of-route ...
He said "via two different autonomous domains", which I took to mean two upstreams... and my understanding is that (on ciscos anyway) you're talking per-packet, not per-flow load balancing. What happens when you intentionally bugger stuff up so that you are per-packet load balancing your outbound traffic between two diverse (ie, non-congruent-to-the-same-upstream-and-pop) paths is left as an exercise to the reader... but I don't think TCP is gonna like it. :) ---rob
Current thread:
- Split flows across Domains Glen Kent (Jan 24)
- Re: Split flows across Domains Robert E . Seastrom (Jan 24)
- Re: Split flows across Domains Christopher L. Morrow (Jan 24)
- Re: Split flows across Domains Robert E . Seastrom (Jan 24)
- Re: Split flows across Domains Joe Abley (Jan 24)
- Re: Split flows across Domains Joe Abley (Jan 24)
- Re: Split flows across Domains Robert E . Seastrom (Jan 24)
- Re: Split flows across Domains Joe Abley (Jan 24)
- Re: Split flows across Domains Robert E . Seastrom (Jan 24)
- Re: Split flows across Domains Simon Leinen (Jan 25)
- Re: Split flows across Domains Christopher L. Morrow (Jan 24)
- Re: Split flows across Domains Christopher L. Morrow (Jan 24)
- Re: Split flows across Domains Matt Buford (Jan 24)
- Re: Split flows across Domains Joe Abley (Jan 24)
- Re: Split flows across Domains Steven M. Bellovin (Jan 25)
- Re: Split flows across Domains Robert E . Seastrom (Jan 24)