BigIron RX Series Configuration Guide
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53-1001810-01
Configuring packet drop priority using WRED
18
In addition, the maximum drop probability, the minimum and maximum average queue size, and
the maximum packet size can be configured to apply selectively to packets with a specified queue
type and DSCP/TOS value. The following sections describe how to set the following drop
precedence parameters for each of the four DSCP/TOS values for each of the four queue types:
•
“Setting the maximum drop probability”
•
“Setting the minimum and maximum average queue size”
•
“Setting the maximum packet size”
•
Packets that do not have the DSCP/TOS value set are assigned a drop precedence equal to the
DSCP/TOS level of 0.
Setting the maximum drop probability
To set the maximum drop probability when the queue size reaches the Max-average-q-size value to
20% use the following command.
BigIron RX(config)#qos queue-type 1 wred drop-precedence 0 drop-probability-max
20%
Syntax: [no] qos queue-type <queue-number> wred drop-precedence <policing-status>
drop-probability-max
<p-max%>
The
<queue-number>
variable is the number of the forwarding queue that you want to configure
drop-precedence for. There are four forwarding queues on device. They are numbered 0 to 3 with
zero as the lowest priority queue and three the highest.
The
<policing-status>
variable indicates the traffic policing status for which you want to configure
drop-precedence.
The <
p-max%>
variable defines the maximum drop probability in when the queue size is at the
value configured for max-avg-q-size. This value is expressed as a percentage.
Configuring the maximum instantaneous queue size
You can set the maximum size to which a queue is allowed to grow. Packets that cause the queue
to grow beyond this setting are unconditionally dropped. To set the maximum instantaneous queue
size for queues with a queue type of 1 to 32000, use the following command.
BigIron RX(config)#qos queue-type 1 max-queue-size 32
Syntax: [no] qos queue-type
<queue-number>
max-queue-size
<max-queue>
The
<queue-type>
variable is the number of the forwarding queue type that you want to configure
the instantaneous-queue-size parameter for. There are eight forwarding queue types on device
Routers. They are numbered 0 to 3.
The
<max-queue>
variable is the maximum size to which a queue is allowed to grow. It is defined in
Kbytes. The default values are shown in
Table 93
.
Setting the minimum and maximum average queue size
To set the maximum average queue size for queue type 1 and drop precedence 0 to the maximum
size of 32768 Kbytes, use the following command.
BigIron RX(config)#qos queue-type 1 wred drop-precedence 0 max-avg-queue-size
32768
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