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New Member

CPU load Problem

Hello,

I am using 2950, CPU load of the switch is often increase upto 80 and 90%.

I attached a file which contain the CPU Services detail..

3 REPLIES

Re: CPU load Problem

Hi,

do you have a lot of broadcast traffic?

Regards, Martin

New Member

Re: CPU load Problem

No, i dont have that much traffic which increase the CPU load to 90 %.

Re: CPU load Problem

Hi,

do you have multicast traffic? It seems that quite some portion comes from IGMP snooping.

From

http://www.cisco.com/en/US/products/ps6552/products_white_paper09186a00800d6b5e.shtml#xtocid17

"Because IGMP control messages are sent as multicast packets, they are indistinguishable from multicast data at Layer 2. A switch running IGMP Snooping must examine every multicast data packet to determine if it contains any pertinent IGMP control information. IGMP Snooping implemented on a low-end switch with a slow CPU could have a severe performance impact when data is sent at high rates. The solution is to implement IGMP Snooping on high-end switches with special application-specific integrated circuits (ASICs) that can perform the IGMP checks in hardware. CGMP is a better option for low-end switches without special hardware."

So try to turn off IGMP snooping and rather use CGMP if required.

Regards, Martin

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