CCIE Routing & Switching v5 Workbook -
CCIE R&S v5 Advanced Technology Labs -
LAN Switching
Storm Control
A Note On Section Initial Configuration Files: You must load the
initial configuration files for the section, named LAN Switching Initial
Spanning Tree, which can be found in
. Reference the Virtual Routers &
Physical Switches Diagram to complete this task.
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.
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
Verification
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%