On Thursday 26 February 2009 02:34:42 Gert Doering wrote: > With an RSP8 and only two active interface at a time, throughput of that > box will likely be better (and less bug-prone) if you disable "distributed > switching".
Some of the features I'm using disable dCEF implicitly for packets touched by those features (Stateful NAT and CBAC, for instance, if I'm reading the docs right), but I have done that in the config anyway due to the performance benefits with few interfaces. Even before explicitly disabling dCEF, I wasn't seeing but a handful of packets take that switching path according to 'show int stats'. And, before anyone says it: I'm fully aware a 7200 with NPE-G1 or G2 would be a better choice for that feature mix, but I used what I had on hand to replace a failed 7400, and I don't currently own any 7200s. Oddly enough, though, with the particular feature mix I'm using the 7400 is showing less CPU% used and getting better performance (it's documented to do 153Mb/s using CEF according to the same routerperformance.pdf), but I'm seeing the PXF get involved on a few paths (haven't yet hit any PXF bugs that I know of, thankfully), but even then the percentage of packets taking the PXF path is a very small fraction. -- Lamar Owen Chief Information Officer Pisgah Astronomical Research Institute 1 PARI Drive Rosman, NC 28772 http://www.pari.edu _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/