Rockwell Automation 1783-Mxxx Stratix 8000 and 8300 Ethernet Managed Switches User Manual - Manual (Page 72)

72 Rockwell Automation Publication 1783-UM003I-EN-P - March 2014
Chapter 3 Switch Software Features
Figure 9 - 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
lets more packets 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 Logix Designer application.
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 port roles have a maximum number of MAC IDs that can use that port.
For example, the Automation Device port role sets up the port for a maximum of
one MAC ID. The MAC ID is dynamic, meaning the switch learns the first
source MAC ID to use the port. Attempts by any other MAC ID to access the
port are denied.
If the link becomes inactive, the switch dynamically relearns the MAC ID to be
secured.
Forwarded Traffic
Blocked Traffic
Total number of
broadcast
packets or bytes
Threshold
Time 0 T1 T2 T3 T4 T5
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.