User manual

38 Publication 1783-UM003D-EN-E - December 2009
Chapter 2
Storm Control Example
The combination of the storm-control suppression level and the 1-second
time interval controls the way the storm control algorithm works. A higher
threshold allows more packets to pass through. A threshold value of 100%
means that no limit is placed on the traffic. A value of 0.0 means that all
broadcast, multicast, or unicast traffic on that port is blocked.
Default Storm Control Configuration
By default, unicast, broadcast, and multicast storm control are disabled. You
can set a threshold by using the RSLogix 5000 software.
Port Security
The switch has two methods for limiting the MAC addresses (MAC IDs) that
can access a given port:
• dynamic.
• static.
Dynamic Secure MAC Address (MAC ID)
Many Smartport roles have a maximum number of MAC IDs that are allowed
to use that port. For example, the Smartport role ‘Automation Device’ sets up
the port for a maximum of one MAC ID. The MAC ID is dynamic, meaning
Total
number of
broadcast
packets
or bytes
Forwarded traffic
0T1
Threshold
T2 T4 T5
15664
T3 Time
Blocked traffic
IMPORTANT
Because packets do not arrive at uniform intervals, the
1-second time interval during which traffic activity is measured
can affect the behavior of storm control.