Cisco Asr 9000 Series Aggregation Services Router Modular Quality Of Service Configuration Guide, Release - Cisco ASR 9000 Series Configuration Manual

Configuring Weighted Random Early Detection
SUMMARY STEPS
1. configure
2. policy-map policy-name
3. class class-name
4. random-detect dscp dscp-value min-threshold [units] max-threshold [units]
5. bandwidth {bandwidth [units] | percent value} or bandwidth remaining [percent value | ratio
ratio-value]
6. bandwidth {bandwidth [units] | percent value}
7. bandwidth remaining percent value
8. shape average {percent percentage | value [units]}
9. queue-limit value [units]
10. exit
11. interface type interface-path-id
12. service-policy {input | output} policy-map
13. commit
DETAILED STEPS
Command or Action
Step 1
configure
Step 2
policy-map policy-name
Example:
RP/0/RSP0/CPU0:router(config)# policy-map
policy1
Step 3 class class-name
Example:
RP/0/RSP0/CPU0:router(config-pmap)# class
class1
Step 4 random-detect dscp dscp-value min-threshold
[units] max-threshold [units]
Example:
RP/0/RSP0/CPU0:router(config-pmap-c)#
random-detect dscp af11 1000000 bytes
2000000 bytes

Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide, Release

6.1.x
44
Configuring Modular QoS Congestion Avoidance
Purpose
Creates or modifies a policy map that can be attached to one or more
interfaces to specify a service policy and enters the policy map
configuration mode.
Specifies the name of the class whose policy you want to create or
change and enters the policy map class configuration mode.
Modifies the minimum and maximum packet thresholds for the DSCP
value.
• Enables WRED.
• dscp-value—Number from 0 to 63 that sets the DSCP value.
Reserved keywords can be specified instead of numeric values.
• min-threshold—Minimum threshold in the specified units. When
the average queue length reaches the minimum threshold, WRED
randomly drops some packets with the specified DSCP value.
• max-threshold—Maximum threshold in the specified units.
When the average queue length exceeds the maximum threshold,
WRED drops all packets with the specified DSCP value.