Cisco 10000 Series Configuration Manual page 394

Configuring Fair Bandwidth Sharing During Congestion
Command
Step 4
Router(config-pmap-c)# queue-limit
number-of-packets
Step 5
Router(config-pmap-c)# random-detect
Step 6
Router(config-pmap-c)# random-detect
exponential-weighting-constant exponent
or
Router(config-pmap-c)# random-detect
precedence precedence min-threshold
max-threshold mark-prob-denominator
Cisco 10000 Series Router Quality of Service Configuration Guide
12-10
Chapter 12
Purpose
(Optional) Specifies the maximum number of packets that the
queue can accumulate for this class.
number-of-packets is a number from 1 to 64. The default number
of queue entries is based on the bandwidth rate.
When you specify the queue-limit command, the router
Note
uses tail drop to drop packets.
(Optional) Enables WRED.
Note When you specify the random-detect command, the
policy map uses WRED to drop packets, not tail drop. If
you configure a class to use WRED, you must ensure that
WRED is not configured on the interface to which you
intend to attach the service policy.
Configures the exponential weight factor used in calculating the
average queue length.
exponent is a number from 1 to 16 used in the average queue size
calculation.
Configures WRED parameters for packets with a specific IP
precedence. Repeat this command for each precedence.
precedence is the IP precedence number. Valid values are from 0
to 7.
min-threshold is the minimum average queue length, expressed in
number of packets. Valid values are from 1 to 4096. When the
average queue length reaches the minimum threshold, WRED
randomly drops some packets with the specified IP precedence.
max-threshold is the maximum average queue length, expressed
in number of packets. Valid values are from the value of the
min-threshold to 4096. When the average queue length exceeds
the maximum threshold, WRED drops all packets with the
specified IP precedence.
mark-prob-denominator is the denominator for the fraction of
packets dropped when the average queue depth is at the maximum
threshold. For example, if the denominator is 512, 1 out of every
512 packets is dropped when the average queue is at the maximum
threshold. Valid values are from 1 to 65536. The default is 10 (1
out of every 10 packets is dropped at the maximum threshold).
Sharing Bandwidth Fairly During Congestion
OL-7433-09