Even with “ip options drop”, we are still seeing a fraction of packets being cpu switched (about 0.2% input and 1% output) even though we are using CEF. Looks like they are mostly door-knob packets destined for the router itself (which is ACL’d) or some other annoyance. We tuned the buffers to solve the cosmetic counter issue with input/output errors. Since we increased the buffers, the counters have been clean, and the “show buffers” did show a shortage of buffers, so even on the 7200 with particles, perhaps the CLI uses the buffers construct regardless. Maybe it was just a placebo effect.
rtr-inet2#sh int gi0/1 stats GigabitEthernet0/1 Switching path Pkts In Chars In Pkts Out Chars Out Processor 2824573 677403057 2958521 196941357 Route cache 944226953 181329390 274701286 1591461341 Total 947051526 858732447 277659807 1788402698 rtr-inet2#sh ip cef switching statistics Path Reason Drop Punt Punt2Host RP LES Packet destined for us 0 4377823 0 RP LES Total 0 4377823 0 RP PAS No route 3923 0 0 RP PAS Packet destined for us 0 4933417 8 RP PAS No adjacency 3476 0 0 RP PAS Incomplete adjacency 1204250 0 0 RP PAS TTL expired 0 0 2709278 RP PAS Routed to Null0 392389023 0 0 RP PAS Features 151528682 0 22614 RP PAS IP redirects 0 0 12358 RP PAS Neighbor resolution req 399660 0 0 RP PAS Total 545529014 4933417 2744258 All Total 545529014 9311240 2744258 On Jul 8, 2015, at 4:13 AM, Lukas Tribus <luky...@hotmail.com<mailto:luky...@hotmail.com>> wrote: "on a 10000". The 7200 uses particles, not buffers... Also, its not relevant for CEF-switched traffic. So unless your configuration requires fast-switching or process-switching, you don't need to worry about buffer/particle tuning at all. Lukas _______________________________________________ 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/