Alex Howells wrote: >>> Thanks guys :) Was just pondering whether a Catalyst 4948 would be good >>> enough for deployment with two partial feeds, as 76xx series is somewhat >>> expensive for that particular project! >>> >>> Guessing the FIB on it will be the limiting factor. >> Very very partial feeds. The 4948 is limited 32,000 routes. Even the >> 4900M is limited to 200,000. >> >> http://tinyurl.com/2zd3v4 >> >> If you want to carry full tables you'd be better off looking at routers >> and not switches. I have 3800s and 2800s with full tables (even had >> some 3600s). If this is a new purchase then I'd recommend a 7200 such >> as the 7201. > > Asking purely out of 'curiosity' because a friend who works for an > up-and-coming social network aggregator is needing to expand his > network, starting to take on their own feeds, etc. > > They've acquired a couple of Catalyst 4948's on the advice from a > network engineer that they'll take two full tables.
Alex, You need to be aware of two things: architectures in which FIB is in the RAM (800/1800/2800/3800/7200), and in the hardware (TCAMs/etc) - 7600/12000/CRS-1/Cat2/3/4/6k. I assumed You're asking for software architectures, as usually BGP is implemented on those boxes, however valid points appeared on this thread as far as PFC3B/3C and PFC3BXL/CXL is concerned on 7600 platform. For full BGP table You need XL versions, to be able to fit >249k prefixes for IPv4. And unfortunately, all smaller Catalysts that can route and support BGP (3/4k) can't support such number of routes (usually 10-12 or 20k, with Sup6E for 4500E supporting 256k but that is already too low for full BGP table, however nobody positions 4500E as internet-edge router). -- "Don't expect me to cry for all the | Łukasz Bromirski reasons you had to die" -- Kurt Cobain | http://lukasz.bromirski.net _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
