Chapter 4 Monitoring
Check the Trends Graphs
4-16
User Guide for the Catalyst Express 500 Switches
OL-8122-01
Packet Error Graph
The Packet Error graph shows the same information as the Packet Error gauge on
the Dashboard, except that 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 effects 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 check if the data on the graph changes when you
disconnect and reconnect the suspected device. For more information about
packet errors, see the
“Packet Error Gauge” section on page 4-11
.
PoE Utilization Graph
The PoE Utilization graph is only available if the switch is a PoE switch. This
graph shows the same information as the PoE Utilization gauge on the Dashboard.
The percentage of power allocated is shown over ten 60-second system refresh
cycles. For more information about power allocation, see the
“PoE Gauge”
section on page 4-12
.
Per-Port Utilization and Per-Port Errors Graphs
The Port Utilization and Port Errors graphs on the Trends window show the same
information as the Port Utilization and Port Errors graphs on the Dashboard,
except that the graphs on the Trends window 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.
For more information about port usage and port errors, see the
“Port Utilization
and Port Errors Graphs” section on page 4-13
.
