Cisco ASR 9000 Series Service Configuration Manual page 95

Configuring Modular QoS Congestion Avoidance on Cisco ASR 9000 Series Routers
Command or Action
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
Step 5
bandwidth { bandwidth [ units ] | percent value }
or
bandwidth remaining [percent value
ratio-value ]
Example:
RP/0/RSP0/CPU0:router(config-pmap-c)# bandwidth
percent 30
or
RP/0/RSP0/CPU0:router(config-pmap-c)# bandwidth
remaining percent 20
Step 6
shape average {percent percentage | value
[ units ]}
Example:
RP/0/RSP0/CPU0:router(config-pmap-c)# shape
average percent 50
Step 7
queue-limit value [ units ]
Example:
RP/0/RSP0/CPU0:router(config-pmap-c)#
queue-limit 50 ms
Step 8
exit
Example:
RP/0/RSP0/CPU0:router(config-pmap)# exit
OL-23108-02
How to Configure Modular QoS Congestion Avoidance on Cisco ASR 9000 Series Routers
|
ratio
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide
Purpose
Changes 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.
units—Units of the threshold value. This can be bytes,
•
gbytes, kbytes, mbytes, ms (milliseconds), packets, or
us (microseconds). The default is packets.
This example shows that for packets with DSCP AF11,
•
the WRED minimum threshold is 1,000,000 bytes and
maximum threshold is 2,000,000 bytes.
(Optional) Specifies the bandwidth allocated for a class
belonging to a policy map.
or
(Optional) Specifies how to allocate leftover bandwidth to
various classes.
One of these configurations is required for a
Note
non-default class.
(Optional) Shapes traffic to the specified bit rate or a
percentage of the available bandwidth.
(Optional) Changes queue-limit to fine-tune the amount of
buffers available for each queue. The default queue-limit is
100 ms of the service rate for a given queue class.
Returns the router to global configuration mode.
QC-81