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228 Rockwell Automation Publication 1783-UM007I-EN-P - December 2017
Chapter 3 Configure Switch Features
Figure 31 - Port Thresholds Example
The combination of the storm-control suppression level and the 1-second time
interval controls the way the port thresholds algorithm works. A higher
threshold enables 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.
Outgoing (rate limiting)
Outgoing port thresholds limit the rate at which the switch communicates
with a client device as a percentage of wire speed. Limiting bandwidth to
specific users and ports helps control network congestion, enable high
performance, create efficient networks, and prevent a few devices from
monopolizing network bandwidth. It can also improve reliability by limiting
maximum bandwidth to end devices that are not capable of handling large
amounts of traffic. From Device Manager or the Logix Designer application,
you can enable or disable rate limiting on a per port basis.
Default Port Thresholds Configuration
By default, incoming unicast, broadcast, and multicast port thresholds are
disabled. Outgoing port thresholds are also disabled.
T
Total Number of Broadcast
Packets or Bytes
Threshold
Forwarded Traffic
Blocked Traffic
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
port thresholds.