386 Rockwell Automation Publication 1783-UM007G-EN-P - February 2017
Chapter 8 Monitor the Switch
Switch Health
You can use the health gauges to monitor CPU utilization and temperature.
The CPU Utilization gauge shows the percentage of CPU processing power
that is in use on the switch. Data is collected at each 60-second system refresh.
The gauge changes as the switch experiences the network activity from devices
sending data through the network. As network activity increases, so does
contention between devices to send data through the network.
As you monitor utilization on the switch, note whether the percentage of usage
is what you expect during that given time of network activity. If utilization is
high when you expect it to be low, perhaps a problem exists. As you monitor
the switch, note if the bandwidth utilization is consistently high, which can
indicate congestion in the network. If the switch reaches its maximum
bandwidth (above 90% utilization) and its buffers become full, it begins to
discard the data packets that it receives. Some packet loss in the network is not
considered unusual, and the switch is configured to help recover lost packets,
such as by signaling to other devices to resend data. However, excessive packet
loss can create packet errors, which can degrade overall network performance.
To reduce congestion, consider segmenting the network into subnetworks that
are connected by other switches or routers. Look for other causes, such as faulty
devices or connections, which can also increase bandwidth utilization on the
switch.
The Temperature gauge shows the internal temperature of the switch. For
information about the switch temperature range and the operating
environment guidelines, see the Stratix Ethernet Device Specifications
Technical Data, publication
1783-TD001.
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