3.12. Configuring Storm Control

Overview

Function Introduction

Storm control prevents traffic on a LAN from being disrupted by a broadcast, a multicast, or a unicast storm on one of the physical interfaces. A LAN storm occurs when packets flood the LAN, creating excessive traffic and degrading network performance.

Storm control uses one of these methods to measure traffic activity:

  • Bandwidth as a percentage of the total available bandwidth of the port (Level mode).

  • Traffic rate in packets per second of the port (PPS mode).

PPS = Packets per second

Principle Description

N/A

Configuration

Configuring Bandwidth Percentage Storm Control

image

Fig. 3.19 Percentage Storm Control

step 1 Enter the configure mode

Switch# configure terminal

step 2 Enter the interface configure mode, and set the storm control level

User can set different level for Unknown unicast/multicast/broad cast packets:

Switch(config)# interface eth-0-1
Switch(config-if)# storm-control unicast level 0.1
Switch(config-if)# storm-control multicast level 1
Switch(config-if)# storm-control broadcast level 10

step 3 Exit the configure mode

Switch(config-if)# end

step 4 Validation

Switch# show storm-control interface eth-0-1
Port ucastMode ucastlevel bcastMode bcastLevel mcastMode mcastLevel
====================================================================
eth-0-1 Level      0.10     Level       10.00    Level       1.00

Configuring Packets per-Second Storm Control

image

Fig. 3.20 PPS Storm Control

step 1 Enter the configure mode

Switch# configure terminal

step 2 Enter the interface configure mode, and set the storm control pps

User can set different pps for Unknown unicast/multicast/broad cast packets:

Switch(config)# interface eth-0-1
Switch(config-if)# storm-control unicast pps 1000
Switch(config-if)# storm-control multicast pps 10000
Switch(config-if)# storm-control broadcast pps 100000

step 3 Exit the configure mode

Switch(config-if)# end

step 4 Validation

Switch# show storm-control interface eth-0-1
Port ucastMode ucastlevel bcastMode bcastLevel mcastMode mcastLevel
---- --------- ---------- --------- ---------- --------- ---------- 
eth-0-1   PPS       1000        PPS     100000      PPS       10000

Application cases

N/A