On 3/13/07, Loopback <loopback at ezxyz.com> wrote: > > All > > > We would appreciate some ideas for the best method of implementing limited > traffic engineering via BGP for our current network. We have two EBGP > routers in the same physical location with and IBGP connection between > them, > each are dual homed to 3 Tier 1 ISP's and single homed to one other ISP. > > > Router A > > A -----------10Mb/s-------------- ISP #1 > A -----------10Mb/s---------------ISP #2 > A -----------10Mb/s---------------ISP #3 > A -----------10Mb/s---------------ISP #10 > | > | > | Router B > | > B -----------10Mb/s-------------- ISP #1 > B -----------10Mb/s---------------ISP #2 > B -----------10Mb/s---------------ISP #3 > B -----------10Mb/s---------------ISP #20 > > > We currently do not enforce any PBR, our outbound route selection > algorithm > is default "shortest AS-PATH" destination network with the addition of > "BGP Multi-Path" so that any return traffic to routes with equal AS-Path > lengths will balance among all the connections with equal cost. > > > We are going to upgrade the bandwidth on the "ISP #1" connection to a GbE > on > both routers and leave the others at the current bandwidth. This will be > much less expensive connection per Mb/s, for that reason we would like to > prefer it for the return path for all outbound traffic to any destination > that does NOT originate from with the AS of one of our other directly > connected providers. Our thoughts is that approach will combine both > routing efficiency and economy. > > The question is the best method to accomplish this using BGP, and > preferably > without having to coordinate MED's or Community values with our providers. > > Looking forward to hearing your opinions. > > > Jack > > _______________________________________________ > foundry-nsp mailing list > foundry-nsp at puck.nether.net > http://puck.nether.net/mailman/listinfo/foundry-nsp >
Could just add a pre-pend or 2 to each ISP but #1. Most of the non-directly connected networks will likely prefer the shorter AS-PATH. All your directly connected ISP's will, most likely, choose you directly, as customer local-pref is usually set higher than peer. --chip -- Just my $.02, your mileage may vary, batteries not included, etc.... -------------- next part -------------- An HTML attachment was scrubbed... URL: https://puck.nether.net/pipermail/foundry-nsp/attachments/20070313/0ca663c7/attachment.html
