15.3. Slope QoS Policy Command Reference

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

The description command associates a text string with a configuration context to help identify the context in the configuration file.

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

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

This command enables the context to configure the high-priority, low-priority, and non-tcp slope parameters per queue.

This command enables the context to define the high priority Random Early Detection (RED) slope graph. Each buffer pool supports a high priority RED slope for managing access to the shared portion of the buffer pool for high priority or in-profile packets.

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

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

This command enables the context to define the low priority Random Early Detection (RED) slope graph. Each buffer pool supports a low priority RED slope for managing access to the shared portion of the buffer pool for low priority or out-of-profile packets.

The low-slope parameters can be changed at any time and the affected buffer pool low priority RED slopes must be adjusted appropriately.

The no form of this command reverts 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 node will not appear in save config and show config output unless the detail parameter is present.

This command configures non-tcp profile RED slope parameters.

The no form of this command reverts to the default.

This command configures a weighting factor to calculate the new shared buffer average utilization after assigning buffers for a packet entering a queue. To derive the new shared buffer average utilization, the buffer pool takes a portion of the previous shared buffer average and adds it to the inverse portion of the instantaneous shared buffer utilization. The time-average-factor command sets the weighting factor between the old shared buffer average utilization and the current shared buffer instantaneous utilization when calculating the new shared buffer average utilization.

The Time Average Factor (TAF) value applies to all high, low priority, and non-tcp packets WRED slopes for egress access and network buffer pools controlled by the slope policy.

The no form of this command reverts to the default value.

Note: The config>qos>slope-policy>queue>non-tcp-slope context is only supported on the 7210 SAS-M (access-uplink and network mode).

This command configures the low priority or high priority or non-tcp Weighted Random Early Detection (WRED) slope position for the reserved and shared buffer average utilization value where the packet discard probability rises directly to one. The percent parameter is expressed as a percentage of the shared buffer size.

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

Note: The config>qos>slope-policy>queue>non-tcp-slope context is only supported on the 7210 SAS-M (access-uplink and network mode).

This command configures the low priority or high priority Random Early Detection (RED) slope position for the maximum non-one packet discard probability value before the packet discard probability rises directly to one. 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.

The no form of this command reverts the value to the default.

Note: The config>qos>slope-policy>queue>non-tcp-slope context is only supported on the 7210 SAS-M (access-uplink and network mode).

This command enables or disables the administrative status of the Random Early Detection slope.

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

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

Note: The config>qos>slope-policy>queue>non-tcp-slope context is only supported on the 7210 SAS-M (access-uplink and network mode).

This command configures the low priority or high priority Random Early Detection (RED) slope position for the shared buffer average utilization value where the packet discard probability starts to increase above zero. The percent parameter is expressed as a percentage of the shared buffer size.

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

This command sets a weighting factor to calculate the new shared buffer average utilization after assigning buffers for a packet entering a queue. To derive the new shared buffer average utilization, the buffer pool takes a portion of the previous shared buffer average and adds it to the inverse portion of the instantaneous shared buffer utilization. The time-average-factor command sets the weighting factor between the old shared buffer average utilization and the current shared buffer instantaneous utilization when calculating the new shared buffer average utilization.

The TAF value applies to all high, low priority, and non-tcp packets WRED slopes for egress access and network buffer pools controlled by the slope policy.