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Re: Why doesn't BGP...
On Fri, 8 Nov 1996, Marten Terpstra wrote: > Ed Morin <firstname.lastname@example.org> writes > > * Why doesn't BGP pick the link with the highest bandwidth, or, better > * yet, pick the link with the highest bandwidth AND least congestion to > * label as the "best" available route? The needed information is avail- > > The first one is easy, in fact you can do that yourself by fiddling > with metrics or such on the different BGP sessions. The second one > would have dramatic consequences in terms of route instability. You > pick one route now because of load on the link, the load changes and > you pick the other, now BGP will have to change the announcement of > this network to other peers. So, now we not only have flaps because of > links/routers going up and down, we also have flap because of load > changes on the network. The result: you are dampened out forever, or > the network falls over. Is this really true? All I'm asking for is that the route a router considers to be "best" be picked by something a little more rational than the ordinate order of its IP address relative to another link. I don't see a flap situation at all here -- only that a decision to route a packet may change more frequently based on load. Ed Morin Northwest Nexus Inc. (206) 455-3505 (voice) Professional Internet Services edm@nwnexus.WA.COM - - - - - - - - - - - - - - - - -