?Headroom for Netflow on 3662

Unanswered Question
Aug 2nd, 2007
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I have inserted a 3662 (256Mb 12.3(22) ) between our core and an internal pix intending to collect netflow statistics.


Fast0/0 801.q encaps

Fast0/0.86 --> core

Fast0/0.99 --> pix inside interface

Fast0/1 --> pix backend servers

Essentially all of the traffic (for now) consisting of low volume flows runs between the subinterfaces. I have enabled pbr on the core interface to push traffic sourced from the backend hosts to the backend of the pix.

CEF appears enabled by default on all interfaces.

Cpu utilization hovers about 20% and peaks about 50% (see attached proc cpu output)


1. Would enabling netflow likely push Cpu utilization over an acceptable level?

2. Would reconfiguring the interfaces as

Fast0/0 --> core

Fast0/1.99 --> pix inside interface

Fast0/1.11 --> pix backend servers

likely reduce cpu utilization?

Appreciate this and any other advice: thanks!

proc cpu threshhold

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spremkumar Fri, 08/03/2007 - 01:58
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if possible disbale net flow and monitor the utilisation pattern.

Since you have both pbr/netflow enabled in your router you may experience utilisation on higher side when compared to a box without pbr or netflow enabled.



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