dnewman at networktest
Aug 13, 2007, 12:01 PM
Post #1 of 1
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Extreme Switch CPU utilization on port-mirroring ? (Hamid Ahmed)
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On 8/13/07 12:05 PM, St?phane Grosjean wrote:
> Hi,
>
>
>> I have an extreme switch Summit 400-24p. I am running
>> port-mirroring for >two ports on tthe switch. I need to check what
>> impact does it make on the >CPU when i run port mirroring for a
>> said number of ports?
>
> Extreme switches are asic based, not cpu. That means there's no real
> big deal on cpu usage. I assume it should be just fine if you stay on
> the official recommendations.
All switches, even Extreme's, use CPUs to "slow-path" certain traffic
such as control-plane messages (no one does routing purely in hardware)
and data-plane packets with IP options set.
I have not seen any performance degradation from port mirroring but then
again I have not attempted to measure this under heavy load. I would be
curious to know what performance costs, if any, exist for mirroring.
dn
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