Re: [fw-wiz] PIX-515 acceptable CPU usage?
Date: 09/16/04

  • Next message: Ahmed, Balal: "RE: [fw-wiz] PIX-515 acceptable CPU usage?"
    To: Brian Ford <>, Adam Greene <>
    Date: Thu, 16 Sep 2004 04:13:36 -0700 (PDT)

    I agree with Brian !! There is no specific benchmark for the CPU usage. At present, you would be very much comfortable with the CPU usage as it would be around 20-25%. However, it would be great if you consider your future requirements as well.
    Suppose if you are running VPN or SSH which needs encryption or if you are running the PIX as one of the core routers for OSPF then the CPU utilization could go high.
    Another question is whether you really want to use PIX for OSPF i.e. using PIX as router rather than a FW. 6.3.3 is a great code but using PIX as FW and another router to do the job of routing is definitely worth a thought.

    Brian Ford <> wrote:

    You're definitely OK for now. Seems like at worst you'll see 20-25% CPU
    (10% base and 10% if you had 5 interfaces).

    You probably want to try and test a number of use cases including DoS'ing
    on of the less trusted interfaces or (and) establishing a couple of VPN or
    SSH sessions to the PIX and watching what happens.

    Chances are (without looking at your config or knowing how you use the PIX)
    you'll probably spike up to 60% when bad things happen.

    Liberty for All,


    At 02:22 PM 9/3/2004 -0400, wrote:
    >From: "Adam Greene"
    >Date: Fri, 3 Sep 2004 11:47:17 -0400
    >Subject: [fw-wiz] PIX-515 acceptable CPU usage?
    >Hi --
    >We're deploying OSPF on our network for the first time, and it looks like it
    >will be convenient to enable OSPF on our PIX-515-UR's as well (running 6.3.3
    >OS). The problem
    >is, the moment I enable OSPF on the pixes, CPU usage on them shoots up from
    >0-1% to 7-10% (sh cpu usage). Each interface I add to area 0 appears to add
    >1-2% to CPU usage as well.
    >I've tried googling for acceptable CPU usage levels on the PIX, but came up
    >dry. Does anyone have a benchmark they can refer me to?
    >We're going to be passing about 5 Mbps through these pixes in the short term
    >(may grow to 10Mbps or higher). It would be nice to know that ongoing 15%
    >CPU usage is not going to cause noticeable performance degradation to our
    >users (we are broadband ISP).
    >Any input anyone may have is very welcome. Thanks for your help.
    >P.S. we're running 6.3.3 on the pixes

    Brian Ford
    Consulting Engineer, Security & Integrity Specialist
    Office of Strategic Technology Planning
    Cisco Systems Inc.

    The opinions expressed in this message are those of the author and not
    necessarily those of Cisco Systems, Inc..

    This email address is transmitted from San Jose, California, U.S.A..

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  • Next message: Ahmed, Balal: "RE: [fw-wiz] PIX-515 acceptable CPU usage?"

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