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Storm Control

Lesson 35/41 | Study Time: 60 Min
Storm Control

Task 

● Configure SW1 to limit unicast traffic received from SW2 to 100 pps. 

● Configure SW2 to limit broadcast traffic received from SW4 to 10Mbps. 

● Configure SW4 to limit broadcast traffic received from SW1 to 1Mbps using a relative percentage of the interface bandwidth. 

Explanation  

Storm control is used to limit the amount of unicast, multicast, or broadcast traffic received inbound on a port. The most common application of this feature is to prevent broadcast storms, but it can also be used to police individual ports not to exceed a desired rate.

Depending on the version of IOS, the storm-control command may take units in percentage, packets per second, bits per second, or others. Make sure to use the question mark when implementing this command so that the units entered achieve the desired result.

SW2

show storm-control

Interface  Filter State   Upper        Lower        Current 

---------  -------------  -----------  -----------  ---------- 

Fa0/19     Forwarding         10m bps      10m bps        0 bps 

Fa0/20     Forwarding         10m bps      10m bps        0 bps 

SW4

show storm-control   

Interface  Filter State   Upper        Lower        Current 

---------  -------------  -----------  -----------  ---------- 

Fa0/19     Forwarding        1.00%        1.00%        0.00%   

Fa0/20     Forwarding        1.00%        1.00%        0.00% 

Configuration  

SW1: 

interface range FastEthernet0/23 - 24 
storm-control unicast level pps 100 

SW2

interface range FastEthernet0/19 - 20 
storm-control broadcast level bps 10m 

SW4

interface range FastEthernet0/19 - 20
storm-control broadcast level 1