Broadcast Storm Control- 2950 or 3550

Unanswered Question
Feb 22nd, 2007

I seem to be getting multi-cast and uni-cast traffic floods to my customers. All have a public static IP address and need a way to limit it. I've been told that I can do this with the 2950 or 3550 but only with the enhanced image. Can someon set me straight? Can it be limited with PPS or port block?

I have this problem too.
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purohit_810 Thu, 02/22/2007 - 14:58

Hi can you tell me again.. what you have written it is not at all clear

1) in first line... to or from customer??

Command are:

1)To block Unicast::

go into interface configuration mode:

switchport block unicast

2) To do Storm Control Broadcast include multicast.


storm-control broadcast include multicast

For more information look link:


Dharmesh Purohit

sjonessha Thu, 02/22/2007 - 15:07

I am a small wireless ISP and sometimes I get traffic floods originating from the outside of the network. I give my customers public static IPs. I didn't know if the basic 2950 and 3550 would do broadcast storm control. I am going to purchase one of these switches to do the job. I have been told that it will take the Enhanced Image to do this. Any thoughts?

sachinraja Thu, 02/22/2007 - 16:37

Hello Jones,

I dont think you will need Enhanced Image for Storm control features. You can do it with a standard image.... Have a look at the following URL:

search for "storm" and you will see the desired result...

You can also use the software advisor tool on CCO to get the right IOS for the features you need :)

Hope this helps.. all the best.. rate replies if found useful..


sjonessha Fri, 02/23/2007 - 07:56

That sounds good. I have one last question relating to storm control. Does it stop all traffic when the threshold is hit in the port? If I have several customers in that particular port, but only one causing the problem, will they all be shut off completely until the storm subsides?

sachinraja Fri, 02/23/2007 - 14:20

Hello Jones,

Yes stops all traffic.. it only sees the total broadcast received on a port and not for each customer... you should be very careful when u enable it in a point to multipoint scenario... do let us know if you need any more info on this.

Hope this helps.. all the best.. rate replies if found useful..


sjonessha Fri, 02/23/2007 - 14:53

Maybe what I need is something that shapes the traffic and prioritizes. Would the 2950 or 3550e help in this way. I know they have Qos.


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