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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Open Source BGP Route Optimization?
Are there any BGP extensions that would cause a BGP speaker to foward all of it's paths, not just it best? I believe quagga had made some recent attempts in this direction. IIRC the problem isn't to do with the route annoucements, it's the route withdrawals. I believe BGP only specifies the prefix being withdrawn and not the path, so if it's advertised multiple paths to a prefix it's impossible to know which has been withdrawn. Sam Per Gregers Bilse <[email protected]> wrote: > At first I wasn't sure what a "route optimizer" was supposed to do -- > the term is rather generic and could have a lot of different > interpretations. > > A multi-path traffic balancing solution in the style of Cisco's OER > has to be tightly integrated with the routing infrastructure. > Specifically, it needs first hand BGP peer data in order to work > reliably. There will be a number of cases where an add-on solution > might be able to improve on certain things, but there is one major > hurdle: a BGP speaker only forwards its own best paths, so an add-on > analyzer might well never learn about alternative paths. The only > way for any implementation to reliably learn (all) alternative paths > and otherwise maintain routing integrity is by receiving BGP data > first hand, ie directly peer with transit providers and other peers. > > Best, > > -- Per
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