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High CPU load on router 2621XM IOS versioon 12.3

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  • High CPU load on router 2621XM IOS versioon 12.3

    Hello Everyone,

    Am kind of new to the cisco world.

    I've just finished setup 6 vlans. All inter vlan routing is done by a router which have 6 subinterfaces, as we have no layer 3 switch. Anyway after the VLAn implementation users are complaining that they are loosing connections to servers and other network services. After further investigations form my side ive noticed that the routers CPU fluctuating 50%, 60% and sometimes 100%.
    I've run the sh proc cpu command but found nil process with high load.

    But it shows that the router is using a lot of CPU.

    Grateful if you guys can help.

    Thanks.
    Attached Files
    Last edited by tpayet; 5th July 2010, 12:00. Reason: Additional Info

  • #2
    Re: High CPU load on router 2621XM IOS versioon 12.3

    Did you enable cef switching? Sounds like everything is being processed switched (via the cpu).

    ip cef (global configuration)

    You can verify its running by::


    sh ip cef

    sh ip int fa0/0 etc
    CCNA, CCNA-Security, CCNP
    CCIE Security (In Progress)

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    • #3
      Re: High CPU load on router 2621XM IOS versioon 12.3

      Hi Auglan,

      Yes CEF switching is enable. Also am doing monitoring via Solarwinds and i've noticed that when CPU load is high the load on the subinterface also are high.

      Lets say fa0/0.1 is using 30mbps and fa0/0.2 is using 70mbps that's when we get the timed out. I think the 100mbps is being shared between the 6 subinterface and the router can't handle that much traffic.

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      • #4
        Re: High CPU load on router 2621XM IOS versioon 12.3

        Could be an ios bug. Depending on how much memory and flash you have the 2621 will run 12.4. It maybe something to look into. I myself have never run that many subinterfaces before (usually 2 or 3) The better solution would be to get a L3 switch for the intervlan routing function.
        CCNA, CCNA-Security, CCNP
        CCIE Security (In Progress)

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        • #5
          Re: High CPU load on router 2621XM IOS versioon 12.3

          Hi Auglan,

          Thanks. Is it possible to configure an additional router for Inter Vlan routing only and the main router will perform normal routing?

          If yes what are the ways to go about it?

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          • #6
            Re: High CPU load on router 2621XM IOS versioon 12.3

            Sure you could do that but you may run into the same situation. L3 switches are not that expensive anymore. I would push the purchase of a L3 switch imo.
            CCNA, CCNA-Security, CCNP
            CCIE Security (In Progress)

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            • #7
              Re: High CPU load on router 2621XM IOS versioon 12.3

              Hi Auglan,

              Thanks. Am getting the updated ios today. I will try that first. If that doesn't work, we'll have to buy a L3 switch.

              I'll keep you posted.

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