Le mardi 10 mai 2011 à 17:52 -0400, Nick Olsen a écrit : > Greetings NANOG, > Was hoping to gain some insight into common practice with using BGP > Communities downstream. > > For instance: > We peer with AS100 (example) > AS100 peers with TW Telecom (AS4323). > Since I happen to know that AS100 doesn't sanitize the communities I send > with my routes. I can take advantage of TW Telecom's BGP communities for > traffic engineering. Such as 4323:666 (Keep in TWTC Backbone). Would this > be something that is generally frowned upon? Still under the assumption > that the communities aren't scrubbed off my routes. Could I do this with > other AS's beyond TW Telecom? Such as TW's peering with Global Crossing > (AS3549)?
It's quite common, in my experience, that we remove (or at least filter; usually looking at geo-origin ones only) BGP community values from peers and filter them (modulo some set of agreed ones) from customers. In other words, don't generally expect transitivity. mh > > Nick Olsen > Network Operations (855) FLSPEED x106 > >
