On Fri, 30 Sep 2011, Turchanyi Geza wrote:
I realy would like to know what makes you so optimistic? While you think so that a few hundred thousands more routes doesn!t really matter?
Which kind of routers/line cards could support this at wire speed? Any summary of convergence issues in large scale network?
As far as I know, Cisco 7600 with XL PFC, Juniper MX, Cisco ASR 9k, CRS etc, all handle 1M or more routes, or at least a mix of 0.5M IPv4 and 0.25k IPv6 routes. I don't see why number of IPv6 routes would converge a lot slower than number of IPv4 routes.
Am I missed some new technology that is already implemented allmost everywhere?
Prefix independent convergence, ie BGP prefix points to loopback which points to outgoing interface. When you need to converge your IGP you just rewrite the loopback pointers. This doesn't help EBGP of course, but number of routes are increasing slower tham moores law, so as long as the router vendors implement RIB processing in modern hw (not PPC :P), RIB handling is fine. Still, a lot of platforms can only program approximately 10k prefixes per second into hw, so increasing number of prefixes by hundreds of thousands means tens of seconds of increased convergence times for EBGP. -- Mikael Abrahamsson email: swmike@swm.pp.se