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  • #2151635

    Broadcast and the swtich CPU

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    by kevin.livin ·

    I have an app, that sends out LOTS of broadcasts, It is on it own Vlan, and the BCs stay there, BUT the switch CPU rises up to 87% and stays that high. Now maybe I’am wrong but I thought all of that switching would be done in the hardware. Any ideals?

    Thanks, Kevin

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    • #2925570

      Clarifications

      by kevin.livin ·

      In reply to Broadcast and the swtich CPU

      Clarifications

    • #2925561

      Switch?

      by jellimonsta ·

      In reply to Broadcast and the swtich CPU

      What kind of switch?
      Vendor, model, IOS rev?

      • #2925463

        Broadcast and the switch CPU

        by kevin.livin ·

        In reply to Switch?

        It is a cisco 4507R w/IOS 12.2-25. But I was thinking most managed switches would work the same way.

        Thanks, Kevin

        • #2925455

          Factors…

          by jellimonsta ·

          In reply to Broadcast and the switch CPU

          Do you see any events in the log?
          The supervisor module you have in your switch may factor into it, you could also have an IOS bug you are hitting.
          What do you see who you look at show process cpu?
          If it is broadcasting NetBIOS, that can had adverse affects on supervisor modules (if I remember correctly).
          I think broadcast traffic utilized CPU because it forwards up through the stack to see if the supervisor modules is an intended recipient of the broadcast.
          Is this VLAN served off the 4507? Have you tried trunking that segment to a separate layer2 switch to see if it does the same thing to the 4500?

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