storm-control broadcast level - What does this command do exactly?

[murraymwps]

I have a question on whether the following config limits broadcast traffic to 10%. I believe it sends a trap notification when the threshold is reached but does it also limit the broadcast traffic to 10%? Or do I need the "storm-control action shutdown" to accomplish that?

interface GigabitEthernet3/0/2

 switchport access vlan 128

 switchport mode access

 switchport voice vlan 560

 storm-control broadcast level 10.00

 storm-control action trap

 spanning-tree portfast

Thanks

-mike

[Steve Fuller · Accepted solution]

Hi Mike,

As configured the switch will drop broadcast traffic when the level of broadcast received on the interface reaches 10% of the operational link speed. In addition it will send an SNMP trap to indicate storm control threshold has been exceeded and that traffic is being dropped.

The storm-control action shutdown command is only used if you want to operationally disable the port when the threshold is exceeded. You should be careful when deploying this option as connectivity could be lost if, for example, the command was inadvertently configured on an "uplink" interface.

Regards

[paul driver]

Hello

Following on from Steve’s post you can negate storm control shutdown  from permanently disabling the interface by initiating error recovery to automatically recover the interface.

It a good feature to be aware of , But personally I would not want to enable this, as I would like know why such interfaces are receiving such large broadcast/multicast/uncast traffic.

errdisable recovery cause storm-control
errdisable recovery interval xx

res
Paul