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Configuration Commands
Generic Commands
description
Syntax 
description description-string
no description
Context 
config>qos>slope-policy
Description 
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.
Default 
No description is associated with the configuration context.
Parameters 
description-string
A text string describing the entity. Allowed values are any string up to 80 characters long composed of printable, 7-bit ASCII characters. If the string contains special characters (#, $, spaces, etc.), the entire string must be enclosed within double quotes.
 
Operational Commands
copy
Syntax 
copy slope-policy src-name dst-name [overwrite]
Context 
config>qos
Description 
This command copies existing QoS policy entries for a QoS policy-id to another QoS policy-id.
The copy command is a configuration level maintenance tool used to create new policies using existing policies. It also allows bulk modifications to an existing policy with the use of the overwrite keyword.
Parameters 
slope-policy
Indicates that the source policy ID and the destination policy ID are slope policy IDs. Specify the source policy ID that the copy command will attempt to copy from and specify the destination policy ID to which the command will copy a duplicate of the policy.
overwrite
Specifies to replace the existing destination policy. Everything in the existing destination policy will be overwritten with the contents of the source policy. If overwrite is not specified, an error will occur if the destination policy ID exists.
ALA-7>config>qos# copy slope-policy default sp1
MINOR: CLI Destination "sp1" exists - use {overwrite}.
ALA-7>config>qos#overwrite
 
Slope Policy QoS Commands
slope-policy
Syntax 
[no] slope-policy name
Context 
config>qos
Description 
This command enables the context to configure a QoS slope policy.
Default 
slope-policy “default”
Parameters 
name
The name of the slope policy.
Values
time-average-factor
Syntax 
time-average-factor value
no time-average-factor
Context 
config>qos>slope-policy
Description 
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 and low priority RED slopes for ingress and egress access buffer pools controlled by the slope policy.
The no form of this command restores the default setting.
Default 
7 - Weighting instantaneous shared buffer utilization is 0.8%.
Parameters 
value
Represents the Time Average Factor (TAF), expressed as a decimal integer. The value specified for TAF affects the speed at which the shared buffer average utilization tracks the instantaneous shared buffer utilization. A low value weights the new shared buffer average utilization calculation more to the shared buffer instantaneous utilization, zero using it exclusively. A high value weights the new shared buffer average utilization calculation more to the previous shared buffer average utilization value.
Values
0 — 15
 
Slope Policy QoS Policy Commands
high-slope
Syntax 
[no] high-slope
Context 
config>qos>slope-policy
Description 
The high-slope context contains the commands and parameters for defining 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 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 node will not appear in save config and show config output unless the detail parameter is present.
low-slope
Syntax 
[no] low-slope
Context 
config>qos>slope-policy
Description 
The low-slope context contains the commands and parameters for defining 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 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 node will not appear in save config and show config output unless the detail parameter is present.
 
RED Slope Commands
max-avg
Syntax 
max-avg percent
no max-avg
Context 
config>qos>slope-policy>high-slope
config>qos>slope-policy>low-slope
Description 
Sets the low priority or high priority Random Early Detection (RED) slope position for the 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 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.
Default 
max-avg 90 — High slope default is 90% buffer utilization before discard probability is 1.
max-avg 75 — Low slope default is 75% buffer utilization before discard probability is 1.
Parameters 
percent
The percentage of the shared buffer space for the buffer pool at which point the drop probability becomes 1. The value entered must be greater or equal to the current setting of start-avg. If the entered value is smaller than the current value of start-avg, an error will occur and no change will take place.
Values
max-prob
Syntax 
max-prob percent
no max-prob
Context 
config>qos>slope-policy>high-slope
config>qos>slope-policy>low-slope
Description 
Sets 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 restores the max-prob value to the default setting.
Default 
max-prob 80 — 80% maximum drop probability corresponding to the max-avg.
Parameters 
percent
The maximum drop probability percentage corresponding to the max-avg, expressed as a decimal integer.
Values 0 — 100
shutdown
Syntax 
[no] shutdown
Context 
config>qos>slope-policy>high-slope
config>qos>slope-policy>low-slope
Description 
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.
Default 
shutdown - RED slope disabled implying a zero (0) drop probability
start-avg
Syntax 
start-avg percent
no start-avg
Context 
config>qos>slope-policy>high-slope
config>qos>slope-policy>low-slope
Description 
This command sets 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 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.
queue
Syntax 
queue queue-id drop-rate num
no queue queue-id
Context 
config>qos>slope-policy>high-slope
config>qos>slope-policy>low-slope
Description 
Sets the low priority or high priority Random Early Detection (RED) slope drop-rate for the shared buffer per queue.
The no form of this command restores the drop-rate value to the default setting.
Default 
drop-rate 1 — High slope default is 1 (6.25 drop-rate) for all the queues, this implies that once the shared buffer utilization reaches the start-threshold level then packets egressing out from a particular queue would be dropped at 6.25% rate.
drop-rate 0 — Low slope default is 0 (100% drop-rate) for all the queues, this implies that once the shared buffer utilization reaches the start-threshold level then packets egressing out from a particular queue would be dropped at 100% rate.
Parameters 
queue-id
Specifies the ID of the queue for which the drop-rate is to be configured.
Values
drop-rate num
Specifies the drop rate to be configured.
Values
 
Show Commands
slope-policy
Syntax 
slope-policy [slope-policy-name] [detail]
Context 
show>qos
Description 
This command displays slope policy information.
Parameters 
slope-policy-name
The name of the slope policy.
detail
Displays detailed information about the slope policy.
Output 
Slope QoS Policy Output Fields
The following table describes slope QoS policy output fields.
 
Specifies the low priority or high priority RED slope position for the shared buffer average utilization value where the packet discard probability starts to increase above zero.
 
Sample Output
A:C# show qos slope-policy 2
===============================================================================
QoS Slope Policy
===============================================================================
Policy         : 2                                                             
Time Avg       : 7 
-------------------------------------------------------------------------------
High Slope Parameters
-------------------------------------------------------------------------------
Start Avg      : 70                           Admin State  : Enabled           
Max Avg        : 90                           Max Prob.    : 100 
-------------------------------------------------------------------------------
Low Slope Parameters
-------------------------------------------------------------------------------
Start Avg      : 30                           Admin State  : Enabled           
Max Avg        : 40                           Max Prob.    : 100               
===============================================================================
 
A:C# show qos slope-policy 2 detail 
===============================================================================
QoS Slope Policy
===============================================================================
Policy         : 2                                                             
Time Avg       : 7 
-------------------------------------------------------------------------------
High Slope Parameters
-------------------------------------------------------------------------------
Start Avg      : 70                           Admin State  : Enabled           
Max Avg        : 90                           Max Prob.    : 100 
-------------------------------------------------------------------------------
Low Slope Parameters
-------------------------------------------------------------------------------
Start Avg      : 30                           Admin State  : Enabled           
Max Avg        : 40                           Max Prob.    : 100 
-------------------------------------------------------------------------------
Associations
-------------------------------------------------------------------------------
Object Type Object Id     Application          Pool
-------------------------------------------------------------------------------
Port        1/1/1         Acc-Egr              default 
===============================================================================
A:C#