[c-nsp] netflow on 7600

[Tim Stevenson]

The ICAM is used to handle hash collisions in the NF table. It 
essentially indicates that 2 unique flows hashed to the same key in 
the hardware, so the NF TCAM stores the index to the flow info for 
one flow, and the ICAM (aka alias CAM) stores the index to the second.

If there are no free entries in the TCAM, or there is already an 
alias entry for a hash key in both the TCAM & ICAM, then you will see 
creation failures. Use the "aggregate" keyword to see the cumulative 
count - the "detail" output is clear on read for the last two values, 
so enter several iterations to see if the creation failures/aliasing 
is happening continuously.

The ICAM is relatively small, it has 128 entries only. In general the 
hash efficiency on 3BXL should give you very good table utilization, 
what is your traffic mix like in this box, it is an unusual looking scenario?

Tim

At 08:13 AM 6/21/2006, Dmitry Kiselev maintained:
>Hi!
>
>Is there *detailed* netflow description for 7600 platform?
>I confused about ICAM role and failures shown below.
>
>7600#sh mls netflow table-contention detailed
>Earl in Module 5
>Detailed Netflow CAM (TCAM and ICAM) Utilization
>================================================
>TCAM Utilization             :   30%
>ICAM Utilization             :   59%
>Netflow TCAM count           :   80763
>Netflow ICAM count           :   76
>Netflow Creation Failures    :   19
>Netflow CAM aliases          :   0
>
>P.S. sup720-3bxl
>
>--
>Dmitry Kiselev
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
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