SUPRRESING BRODCAST FOR SWITCHES

[mmali]

Hi,

Is there a way to stop broadcasting for particular port or ports in swittches.

Regards

M

[Tsasbrink]

It can be done by mac filtering, but your switch has to support this.

Isnt flood limiting an option ?

Why would you stop broadcasting anyway ?

RGZ

Tom

[simonthompson]

If your switch supports it (Version 12.1(13)EA1), use the following command on the interface:

interface FastEthernet0/1

storm-control broadcast level 5.00

This will limit the broadcasts to 5% of the bandwidth.

For Version 12.0(5)WC2b, the command is:

interface FastEthernet0/1

port storm-control broadcast trap

port storm-control broadcast threshold rising 20 falling 10

This will cause a trap to be sent when the port exceeds 20 broadcasts per second.

[nitemite]

Hi-

We use Catalyst 2950's. Currently we are running Cisco IOS version 12.1(20)EA1. The switch has to have the ability to use PVLAN EDGE (Protected ports). You can implement this on every individual switch port.

By implementing (protected ports) you are

Controlling broadcast between protected switch ports, this is very useful on the VLAN because it reduces the risk of potentially harmful packets and unnecessary broadcast entering the network (VLAN)!!!

Keep in mind however,

You should not use this command on switch ports that have servers/routers or a being used to trunk. You will disturb the broadcast of these nodes and they need to broadcast.

So check your IOS version and switch capabilities to see if it allows PVLAN EDGE (Protected Ports).

To date:

#PVLAN is supported on sc0 in the Catalyst 4000 and Catalyst 6000 running CatOS, starting in software release 6.3(1).

#Four MB Catalyst 2900XL series switches do not support the protected port feature, as they cannot be upgraded to Cisco IOS 12.0(5) XU or later code. The latest version of code that runs on the Catalyst 2900XL is Cisco IOS 11.2(8)SA6.

Refer to this link for more info: http://www.cisco.com/warp/public/473/63.html

Hope this helps

Regards,

Don Patterson

Network Analyst

dpatterson@verizonmail.com