On Mon, 31 Jan 2005, Christopher L. Morrow wrote:
Well, long as-path of 100 is certain to be invalid (result of misconfig if
just curious, why would it be invalid?
Its invalid in practice. You can build network with as-path larger then 100 in your lab, but in real world, we do not have this. Of course you might say that its possible that we have less then 100 networks and each one is prepending several of their own as# and real number of networks is something like 20, but even that is too many and each network as-prepending 5 of their own AS is also rather unlikely. One thing I want to note to cisco and other vendor engineers is that one easy way to deal with it might be good if there was a way to "cut" number of as-prepends - i.e. for long as-path with number of same as## in sequence, it might be good if router could automaticly cut the number from 10+ to say 3 for long as-path, i.e. I'd like to have this available: neighbor x.x.x.x max-aspath-sequence 3 Then backbones could set this for their customers and we'll not have these long sequences appearing in at-large bgp table. -- William Leibzon Elan Networks william@elan.net