User manual

Publication 1783-UM003D-EN-E - December 2009 99
Chapter 3
The Trends dialog box displays these graphs.
Graph Description
Bandwidth utilization graph The Bandwidth Utilization graph shows the same information as the Bandwidth Used gauge
on the Dashboard, but the graph can show the bandwidth usage patterns over incremental
instances in time (by 60 seconds, 60 minutes, 24 hours, or 14 days). This graph also marks
the highest peak reached. The default is 60 seconds.
If you see sharp increases in switch usage, use this graph to determine when unusual peaks
in network usage occur.
Packet error graph The Packet Error graph shows the same information as the Packet Error gauge on the
Dashboard, but the graph can show the percentage of packet errors collected over
incremental instances in time (by 60 seconds, 60 minutes, 24 hours, or 14 days). The default
is 60 seconds.
Use this graph to audit the affects that connected devices have on the switch performance
or the network. For example, if you suspect that a connected device is sending error packets,
you can verify if the data on the graph changes when you disconnect and reconnect the
suspected device.
Per-port utilization and per-port errors
graphs
The Port Utilization and Port Errors graphs on the Trends dialog box show the same
information as the Port Utilization and Port Errors graphs on the Dashboard, but the graphs
on the Trends dialog box can show the usage patterns of a specific port over incremental
instances in time (by 60 seconds, 60 minutes, 24 hours, or 14 days). The default is 60
seconds.
To display the trends for a specific port, choose a port from the Port list.
Use these graphs to observe the performance of a specific port. For example, if a network
user is having intermittent network connectivity, use the Port Utilization graph to observe
the traffic patterns on the port to which the user's PC is connected, and use the Port Errors
graph to see if the port is receiving or sending error packets.