System Administration Guide: IP Services

Configuring tokenmt to Be Color Aware

To configure a two-rate tokenmt to be color aware, you must add parameters to specifically add “color awareness.” The following is an example action statement that configures tokenmt to be color aware.

Example 37–1 Color-Aware tokenmt Action for the IPQoS Configuration File

action {
    module tokenmt
    name meter1
    params {
	      committed_rate 4000000
	      peak_rate 8000000
	      committed_burst 4000000
	      peak_burst 8000000
	      global_stats true
	      red_action_name continue
	      yellow_action_name continue
	      green_action_name continue
	      color_aware true
	      color_map {0-20,22:GREEN;21,23-42:RED;43-63:YELLOW}

You turn on color awareness by setting the color_aware parameter to true. As a color-aware meter, tokenmt assumes that the packet has already been marked as red, yellow, or green by a previous tokenmt action. Color-aware tokenmt evaluates a packet by using the DSCP in the packet header in addition to the parameters for a two-rate meter.

The color_map parameter contains an array into which the DSCP in the packet header is mapped. Consider the following color_map array:

color_map {0-20,22:GREEN;21,23-42:RED;43-63:YELLOW}

Packets with a DSCP of 0–20 and 22 are mapped to green. Packets with a DSCP of 21 and 23–42 are mapped to red. Packets with a DSCP of 43–63 are mapped to yellow. tokenmt maintains a default color map. However, you can change the default as needed by using the color_map parameters.

In the color_action_name parameters, you can specify continue to complete processing of the packet. Or, you can add an argument to send the packet to a marker action, for example, yellow_action_name mark22.