QoS Graphs Window

This window is only available for Catalyst 3550 switches. It appears when you choose Reports > QoS Graphs on the menu bar. Use it to:

You can click here to launch the window.

Selecting the Device and Interface

  1. Select a device from the Host Name list.
  2. Select an interface form the Interface list.

Selecting the Types of Data Displayed

  1. In the DSCP list, select one of the DSCP values you chose to monitor in the DSCP Statistics window, or select others to see the collective data on all the DSCP values that you did not choose.
  2. In the Units list, select whether the units on the y-axis will be in Bytes or in Packets.
  3. In the Ingress Graphs and Egress Graphs rows, check as many boxes as you require to produce the graph you want.
    The results of checking each box are described in the following table. The units are assumed to be in packets; if you selected Bytes, the y-axis is the sum of the sizes of the packets that match the selected DSCP value.
Check BoxResults
IncomingDisplays the number of incoming packets with the selected DSCP value.
Policed (ingress)Displays the number of incoming packets that were marked down from the selected DSCP value.
Dropped (ingress)Displays the number of incoming packets with the selected DSCP value that were dropped.
UnchangedDisplays the number of packets for which the selected DSCP value is the original DSCP value.
ClassifiedDisplays the number of packets with a DSCP value that was changed to the selected DSCP value.
OutgoingDisplays the number of outgoing packets with the selected DSCP value.
Policed (egress)Displays the number of outgoing packets that were marked down from the selected DSCP value.
Dropped (egress)Displays the number of outgoing packets with the selected DSCP value that were dropped.

Select the Type of Graph Displayed

From the Type list, click Line, Bar, Stack Bar, Area, or Stack Area to select a type of graph. The appearance of each type is described in this table.

Graph TypeAppearance
LineData points are connected by a line.
BarData points are denoted by the height of bars.
Stack BarMultiple bar graphs, each of a different color, are stacked one upon another.
AreaData points are connected by a line, and the area under the line is filled in.
Stack AreaMultiple area graphs, each of a different color, are stacked one upon another.

Changing the Increments on the Axes

By default, the time increments on the x-axis are 15 minutes apart. To make them closer together or farther apart, select a different value from the Increments list.

If you check the Define Time Span box, you can define the x-axis by holding down the left mouse button and dragging along a segment of the axis. The segment you choose expands to become the entire x-axis. By right-clicking the graph, you return to the default x-axis.

Note: You cannot use the Increments list if the Define Time Span box is checked.

Check the Log Scaling box if you want the increments on the y-axis to scale upward logarithmically rather than arithmetically.

Viewing a Long Span of Data

The scroll bar at the bottom of the graph lets you scroll left and review past data points that have moved off the graph. You can then scroll right to return to the most recent data.

Note: The graph is updated each time the switch is polled. You can change the polling interval (the frequency for collecting the data) by selecting CMS > Preferences and using the Preferences window.