Allocating Bandwidth Between Standard Transmit Queues - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Configuring QoS
To configure the standard transmit-queue WRED-drop thresholds on all ports of each type, perform this
task in privileged mode:
Task
Configure the standard transmit-queue
WRED-drop thresholds on all ports of a given
type.
For 1p2q2t ports, queue number 1 is the low-priority transmit queue and queue number 2 is high priority.
In each queue, the low-priority threshold is number 1 and the high-priority threshold is number 2.
For 1p3q1t ports, queue number 1 is the low-priority transmit queue, queue number 2 is medium
priority, and queue number 3 is high priority. In each queue, the threshold is number 1.
The thresholds are all specified as percentages ranging from 0 to 100. A value of 10 indicates a threshold
when the buffer is 10 percent full.
You can configure both the low WRED threshold and the high WRED threshold. You must set the low
threshold to a lower percentage than the high threshold.
The low WRED threshold is the traffic level under which no traffic is dropped. The high WRED
threshold is the traffic level above which all traffic is dropped. Traffic in the queue between the low and
high WRED thresholds has an increasing chance of being dropped as the queue fills. The default low
WRED threshold is zero (all traffic has some chance of being dropped).
This example shows how to configure the low-priority transmit-queue WRED-drop thresholds:
Console> (enable) set qos wred 1p2q2t queue 1 40:70 70:100
WRED thresholds for queue 1 set to 40:70 and 70:100
Console> (enable)
The threshold in the strict-priority queue is not configurable.
Note

Allocating Bandwidth Between Standard Transmit Queues

The switch transmits frames from one standard queue at a time using a weighted-round robin (WRR)
algorithm. WRR uses a weight value to decide how much to transmit from one queue before switching
to the other. The higher the weight assigned to a queue, the more transmit bandwidth is allocated to it.
To allocate bandwidth between standard transmit queues, perform this task in privileged mode:
Task
Allocate bandwidth between standard transmit
queues.
QoS maintains separate configurations for each port type. This command configures only the standard
queues; the strict-priority queue requires no configuration. The valid values for weight range from
1–255.
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
41-50
Chapter 41
Command
set qos wred 1p2q2t [tx] queue q#
[thr1Lo:]thr1Hi [thr2Lo:]thr2Hi
set qos wred 1p3q1t [tx] queue q#
[thr1Lo:]thr1Hi
on all WRED-capable 1p2q2t ports.
Command
set qos wrr port_type queue1-weight
queue2-weight [queue3-weight]
Configuring QoS
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