Mark, Dimitris, at the time of the test, this L3 switch was not acting as router. In other words it was performing no route lookups, but still the CPU load was ~100% when all the unicast IPv4 TCAM entries were exhausted.
regards, Martin On 2/5/14, Dimitris Befas <[email protected]> wrote: > Maybe the router does process switching for the traffic while the > corresponding table is full. Maybe you can check with sh int x/x while the > cpu is overload. > On Feb 5, 2014 5:56 PM, "Martin T" <[email protected]> wrote: >> >> Hi, >> >> I have a Cisco ME-3600X-24FS-M switch which supports up to 20000 >> unicast IPv4 prefixes with SDM profile in use. If I announce full BGP >> table to this switch and exhaust all the TCAM available for unicast >> IPv4 prefixes: >> >> >> ME3600X#sh platform tcam utilization ucastv4 >> Nile Tcam Utilization per Application & Region: >> ES == Entry size == Number of 80 bit TCAM words >> ================================================================== >> App/Region Start Num Avail ES Used Range Num Used >> ================================================================== >> UCASTV4 0 20480 1 >> nile0 20000 >> nile1 20000 >> >> >> ..then CPU load will be around 100%: >> >> >> 111 111 >> 00090009 1 1 1 1 >> 000900099999609899888998999099399999999909788888889888998899 >> 100 #######* >> 90 #######* >> 80 #######* >> 70 #######* >> 60 ######## >> 50 ######## >> 40 ######## >> 30 ######## >> 20 ######## >> 10 ########************************************************** >> 0....5....1....1....2....2....3....3....4....4....5....5....6 >> 0 5 0 5 0 5 0 5 0 5 0 >> CPU% per minute (last 60 minutes) >> * = maximum CPU% # = average CPU% >> >> According to "sh ip route summary", RAM usage for BGP was around >> 85MiB. What exactly is causing such high CPU usage? I should have run >> "sh processes cpu sorted 5min" during the high CPU usage, but forgot >> to do so. >> >> >> >> regards, >> Martin >> _______________________________________________ >> cisco-nsp mailing list [email protected] >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
