Reference Guide

Quality of Service (QoS) | 673

Scheduler Strict

Policy-based Strict-priority Queueing configuration is done through scheduler strict. It is applied to

Qos-policy-output. When scheduler strict is applied to multiple Queues, high queue number takes

precedence.

Configure policy-based rate shaping

Rate shape egress traffic using the rate-shape command from QOS-POLICY-OUT mode.

Allocate bandwidth to queue

The S-Series schedule packets for egress based on deficit round robin (DRR). This strategy offer a

guaranteed data rate.

Allocate bandwidth to queues only in terms of percentage in the 4-queue and 8-queue systems. Table 37-3

shows the default bandwidth percentage for each queue. Specify WRED drop precedence.

Specify WRED drop precedence

Specify WRED drop precedence is supported only on the platforms z

Specify a WRED profile to yellow and/or green traffic using the wred command from QOS-POLICY-OUT

mode. Refer to Apply a WRED profile to traffic.

Create Policy Maps

There are two types of policy maps: input and output.

Create Input Policy Maps

There are two types of input policy-maps: Layer 3 and Layer 2.

Table 37-3. Default Bandwidth Percentage for Z-Series and S-Series

Queue

Equivalent

Percentage for

4-Queue

Equivalent

Percentage for

8- Queue

0 6.67% 1%

1 13.33% 2%

2 26.67% 3%

3 53.33% 4%

4- 5%

5 - 10%

6 - 25%

7 - 50%