| Dashboard |
|
The Dashboard is the main window for monitoring the status and performance of the switch. The Dashboard displays this information: – Packet errors received and sent – Power utilization and allocation Use the Front Panel view and the Monitor menu options with the Dashboard for a more complete report of the switch status and performance. The Switch Information area provides reference information about the switch.
The Controller Information area provides reference information about the wireless LAN controller on the switch. This information is available on switches that contains a wireless LAN controller.
The Switch Health area has gauges and indicators that show the overall status of the switch, such as: The Bandwidth Used gauge shows the total percentage of the switch bandwidth being used. The actual percentage appears below the graphic. You can also display the actual percentage by moving the pointer over the gauge. Each bar in the gauge represents 10 percent, and does not show increments that are less than 10 percent. The gauge does not show bandwidth percentages that are less than 10 percent. To completely monitor how the switch is handling network traffic, use the Bandwidth Used graph with To manually refresh the gauge, click
The Bandwidth Used gauge changes as the switch experiences the network activity from devices sending data packets through the network. As network activity increases, contention between devices to send data through the network increases. Contention can cause collisions (two devices sending data at the same time), and the devices need to resend their data. Excessive collisions can cause transmission delays. For example, users might experience excessive delays in sending or receiving information through the network. As you monitor the switch, note whether the bandwidth utilization is consistently high, as this can mean that the network is congested. If the switch reaches its maximum bandwidth and its buffers become full, it begins to discard the data packets it receives. Some packet loss in the network is not considered unusual, and the switch is configured to help recover lost packets (such as 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. Also look for other causes, such as faulty devices or connections, that can create the high bandwidth utilization on the switch. The Packet Error gauge shows the packet error percentage for the switch. This percentage is calculated by comparing two values: • The total number of packets that are sent and received • The total number of error packets that are sent and received The actual percentage appears below the graphic. You can also display the actual percentage by moving the pointer over the gauge. Each bar in the gauge represents 10 percent, and does not show increments that are less than 10 percent. The gauge does not show packet error percentages that are less than 10 percent. If the packet-error percentage is high, the switch bandwidth utilization might also be too high (a sign that the network is congested). To completely monitor how the switch is handling network traffic, use the Packet Error gauge with The Port Statistics window displays some of the types of packet errors collected by the switch. The type of packet error can help you identify a more precise cause for some network problems. To manually refresh the gauge, click
These are some types of packet errors.
The PoE Utilization gauge is only for Power over Ethernet (PoE) switches. The power gauge shows the total percentage of power that is allocated to connected devices that are receiving power from the switch. The switch automatically maintains a power budget, monitors and tracks requests for power, and grants power only when it is available. Move the pointer over the gauge to display the actual percentage of power (in watts) that is used and is remaining. Each bar in the gauge represents 10 percent, and does not show increments that are less than 10 percent. The gauge does not show power percentages that are less than 10 percent. For a graph that shows power utilization patterns
over incremental instances in time (up to ten 60-second refresh cycles),
click View Trends. To manually refresh the graph, click
For more information about PoE budgeting, see the switch software configuration guide. The Support window provides a link to the switch documentation. The fan status is only for switches with a fan (or blower). The animated fan shows whether the fan (or blower) on the switch is rotating and thus is functioning normally. If the fan is not rotating, check the physical switch. Also see the switch hardware installation guide for information about the correct operating temperature range for the switch and for troubleshooting information. The Support window provides a link to the switch documentation. Use the thermometer graphic with the animated fan to monitor the relative internal temperature of the switch. The temperature status is only for switches with a temperature sensor and that support temperature threshold configuration. The thermometer graphic shows the relative internal temperature of the switch. The actual temperature (in Celsius) appears below the graphic. Use the thermometer graphic with the animated fan to monitor the switch internal temperature environment. The thermometer graphic displays:
The status shown by the graphic depends on the temperature threshold settings on the switch. These thresholds can differ among switches. To change the temperature thresholds, use the switch command-line interface (CLI). For more information about the temperature thresholds, see the switch software configuration guide and switch command reference. The Support window provides a link to the switch documentation. The Port Utilization graph displays the receive utilization (blue) and transmit utilization (purple) for all the ports. Move the pointer over the color-coded bars in the graph for the utilization percentage for the specific ports. The device manager updates the graph at every 60-second
refresh cycle. To manually refresh the graph, click
Note: Using the Refresh option from your browser reloads the device manager. For a graph that shows per-port utilization patterns over incremental instances in time (up to ten 60-second refresh cycles), click View Trends. For send and receive statistics for each port, click View Port Statistics. To have a better understanding on port usage, use the Port Utilization graph with The proportion of bandwidth allocated to each port can be based on symmetric (evenly distributed bandwidth to each port) or asymmetric (unlike, or unequal, bandwidth among some ports) connections. • Symmetric connections are among ports with the same bandwidth, such as all 100BASE-T. Symmetric connections are optimized for a reasonably distributed traffic load, such as in a peer-to-peer desktop environment. • Asymmetric connections are among ports with unlike bandwidth, such as a combination of 10BASE-T, 100BASE-T, and 1000BASE-T. Asymmetric connections are optimized for client/server traffic flows in which multiple clients simultaneously communicate with a server, requiring more bandwidth dedicated to the server port to prevent a bottleneck at that port. Bandwidth allocation can also be based on whether the connection is operating in half-duplex or full-duplex mode. |
Refresh on the toolbar. For a graph that shows bandwidth utilization
patterns over incremental instances in time (up to ten 60-second refresh
cycles), click View Trends.