how brodcast influence L2 Switch

Unanswered Question
May 21st, 2012

Hi all,

i need to uderstand the influence of broadcast traffic in regard to the number of active recievers.

for example:

i have server that send broadcast of 5Mbps. there are 10 active users on the same L2 switch that recieves the broadcast. the cpu on that situation is 60%.

if i have the same broadcast stream but now there are 20 active users that need to get this broadcast, should i accept for increase in the switch CPU ?

thanks Avi.

I have this problem too.
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gaursin2 Wed, 05/23/2012 - 22:51

Hi Avi,

is the high utilization is because of traffic, and if yes then there could be a possibility of rise not because of broadcast but new addition of unicast reply from newly added users, in case application is two way.

svibeesh85 Sun, 06/03/2012 - 14:12

Are you sure the brodcast storm is required ?

I strongly recommend you use storm control as you know the amount of broadcast that can be allowed.

Cap the broacast on all ports to a minimum other than the server port.

JosephDoherty Mon, 06/04/2012 - 06:27

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A well designed L2 switch should replicate broadcast packets in hardware, i.e. you shouldn't see much if any increase in the switch's CPU.

However, if the switch's management address is on the same subnet as the broadcasts, the switch's CPU might go high processing the received broadcasts.

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Posted May 21, 2012 at 4:17 AM
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