7.4. Slope QoS Policy Command Reference

This command creates a text description stored in the configuration file for a configuration context.

The no form of this command removes any description string from the context.

This command enables the context to configure a QoS slope policy.

The high-slope context contains the commands and parameters for defining the high-priority Weighted Random Early Detection (WRED) or Random Early Detection (RED) slope graph. Each queue supports a high-priority WRED/RED slope for managing access to the queue for low-priority or out-of-profile packets.

The high-slope parameters can be changed at any time and the affected queue high-priority WRED/RED slopes will be adjusted appropriately.

The no form of this command restores the high slope configuration commands to the default values. If the commands within high-slope are set to the default parameters, the high-slope mode will not appear in save config and show config output unless the detail parameter is present.

The low-slope context contains the commands and parameters for defining the low-priority or high-priority WRED/RED slope graph. Each queue supports a low-priority WRED/RED slope for managing access to the queue for low-priority or out-of-profile packets.

The low-slope parameters can be changed at any time and the queue low-priority WRED/RED slopes will be adjusted appropriately.

The no form of this command restores the low slope configuration commands to the default values. If the leaf commands within low-slope are set to the default parameters, the low-slope mode will not appear in save config and show config output unless the detail parameter is present.

This command sets the low-priority or high-priority WRED or RED slope position for the queue average usage value where the packet discard probability rises directly to one (maxThreshold or maxT). The percent parameter is expressed as a percentage of the maximum queue depth (buffer-based WRED) or a percentage of maximum payload of the queue (payload-based WRED).

The no form of this command restores the max-avg value to the default setting. If the current start-avg setting is larger than the default, an error will occur and the max-avg setting will not be changed to the default.

This command sets the high-priority or low-priority WRED/RED maximum discard probability (maxDP) at slope position max-avg. The percent parameter is expressed as a percentage of packet discard probability where always discard is a probability of 1. A max-prob value of 80 represents 80% of 1, or a packet discard probability of 0.8.

For bridging domain queues on the 2-port 10GigE (Ethernet) Adapter card and 2-port 10GigE (Ethernet) module, the queues support the following DP (discard probability) values: 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 25%, 50%, 75%, and 100%. User-configured values are rounded down to match these DP values.

For example, configuring a DP to be 74% means that the actual value used is 50%.

The no form of this command restores the max-prob value to the default setting.

This command enables or disables the administrative status of the WRED/RED slope.

By default, all slopes are shut down and have to be explicitly enabled (no shutdown).

The no form of this command administratively enables the WRED/RED slope.

This command sets the high-priority or low-priority WRED/RED slope position for the queue average usage value where the packet discard probability starts to increase above zero (minThreshold or minT). The percent parameter is expressed as a percentage of the maximum queue depth (buffer-based WRED) or a percentage of maximum payload of the queue (payload-based WRED).

The no form of this command restores the start-avg value to the default setting. If the max-avg setting is smaller than the default, an error will occur and the start-avg setting will not be changed to the default.