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.
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.