On Thu, 26 May 2005, Todd Underwood wrote: > the scalability problem, as i understand it (not at all an expert > here) is that routers won't currently handle such a list with regexps > very well. apparently, ciscos will not allow filtering advertisements > on a combination of prefix + as-path regexp at all and junipers will, > but the perception is that they will not scale to a list of 300-500K > (which is the union of routes in global tables without any > consolidation). if you could consolidate all equally originated > prefixes under their covering supernets and still adequately filter, > that number would be *much* smaller, obviously. Or if you could do it based on atoms rather than prefixes. But atoms have been looking like a trickier concept than I first thought, as we've started to look at them. -Bill