Configure Storm Control in Cisco IOS

Configure Storm Control in Cisco IOS

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Storm control is a feature used to remedy broadcast, multicast, and unicast unknown overruns in the LAN network.

  • Thresholds are configured, and action is taken if these thresholds are exceeded.
  • Configured per interface
  • Thresholds are defined as:
    • Level: Threshold-based on the percentage of the interface bandwidth.
    • Bps: Threshold-based on the number of bits per second.
    • Pps: Threshold-based on the number of packets per second.
  • You can configure a shutdown action or execute an SNMP trap.

To configure the thresholds for frames received on a port before being flooded by all others is:

Switch(config-if)# storm-control { broadcast | multicast | unicast} level { level [ level-low] | bps bps [ bps-low] | pps pps [ pps-low ] }

Next, specify the action to be taken when the threshold is exceeded. By default, excessive frames are simply dropped as they are received, but we can assign two other actions:

Switch(config-if)# storm-control action { shutdown | trap}


Example:

Switch(config-if)# storm-control broadcast level 50
Switch(config-if)# storm-control broadcast level bps 10000
Switch(config-if)# storm-control action trap

Verification commands:

Switch# show storm-control [ interface-id] [ broadcast | multicast | unicast]

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