Take a look at a product called "Path Control" by RouteScience. http://www.routescience.com/ I have seen their product in action and it is very slick. Does exactly what you want, plus a whole lot more and does it transparently (so if it fails you aren't SOL) via manipulating BGP tables and nexthop based on a multitude of criteria. K Stanislav Rost To: nanog@merit.edu <stanrost@lcs cc: .mit.edu> Subject: Aggregate traffic management Sent by: owner-nanog@m erit.edu 01/28/2003 04:59 PM Dear NANOGers, I have a very hands-on question: Suppose I am a network operator for a decent-sized ISP, and I decide that I want to "divide" aggregate traffic flowing through a router toward some destination, in order to then send some of it through one route and the remainder through another route. Thus, I desire to enforce some traffic engineering decision. How would I be able to accomplish this "division"? What technologies (even if vendor-specific) would I use? I can think of some methods like prefix-matching classification and ECMP, but I am still not sure exactly how the latter works in practice (at the router level) and how one may set them up to achieve such load-sharing. Thank you for your expertise and lore, -- Stanislav Rost <stanrost@lcs.mit.edu> Laboratory for Computer Science, MIT