[c-nsp] netflow on sup1a

[christian.macnevin at uk.bnpparibas.com]

Hello again helpful ones,

We're looking at implementing Crannog here, for which we need to tune all 
of our netflow to its
fastest aging timers and export frequency. I've got the lads to test the 
recommended settings
on a few platforms here, and while the 4500 with an onboard NSC did fine, 
a 6k with sup1A hated
it and CPU usage jumped from around 15-20% to peaking at 80. The guys 
backed out after
five minutes of that.

The device is running in hybrid mode. The PFC onboard supports Netflow I 
believe, but I'm wondering
if this architecture first punts the packets to the SP before the ASIC 
sees them or something?

The config they ran (just in CatOS, didn't get to the MSFC):

set mls nde <destination> 9991
set mls nde version 7
set mls agingtime long 64
set mls agingtime 32
set mls flow full
set mls nde enable

Cheers
Christian


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