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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Load balance over multiple bgp feeds
On Thu, Apr 21, 2005 at 05:06:27PM -0700, Will Yardley wrote: > On Thu, Apr 21, 2005 at 06:47:36PM -0500, Mike Hyde wrote: [ Sorry for the self-followup. ] > > I was wondering what everyone does to load balance over multiple > > bgp feeds. We currently have 5 bgp feeds with 2 providers. Do you > > just randomly pick networks, or use something like netflow to try > > and pick the best path. > A lot of it depends on what you're trying to balance for (cost? > performance?), the size of each link, the type of traffic you're > dealing with, and other factors. Also, my experience has been in fairly content-heavy networks. Shaping inbound traffic can be a little more difficult (lots of information on this online). If your provider supports communities, they may allow you to prepend selectively to certain ASes or in certain geographical locations -- and of course you can play around with prepending. > I've generally been able to get surprisingly accurate results in > terms of how much traffic to send out one link or another just by > using route-maps and some simple netflow analysis, plus traceroute / > ping. Probably obvious, but if your providers support communities, this can be extremely helpful... you can often use these to do some slightly less kludgy traffic-shaping - "prioritize traffic learned from provider X's customers, but not from their peers", or "prioritize provider X's peers in our city, but de-prioritize their peers in the Bay area". In addition to internal documentation, many providers put information on the communities they support in the routing-registry entry for their AS. w
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