Name: Cisco Catalyst 3750-E
Brand: Cisco
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37-84

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

OL-9775-08

Chapter 37 Configuring QoS

Configuring Standard QoS

These sections contain this configuration information:

• Configuration Guidelines, page 37-85

• Allocating Buffer Space to and Setting WTD Thresholds for an Egress Queue-Set, page 37-85

(optional)

• Mapping DSCP or CoS Values to an Egress Queue and to a Threshold ID, page 37-87 (optional)

• Configuring SRR Shaped Weights on Egress Queues, page 37-89 (optional)

• Configuring SRR Shared Weights on Egress Queues, page 37-90 (optional)

• Configuring the Egress Expedite Queue, page 37-90 (optional)

• Limiting the Bandwidth on an Egress Interface, page 37-91 (optional)

Configuration Guidelines

Follow these guidelines when the expedite queue is enabled or the egress queues are serviced based on

their SRR weights:

• If the egress expedite queue is enabled, it overrides the SRR shaped and shared weights for queue 1.

• If the egress expedite queue is disabled and the SRR shaped and shared weights are configured, the

shaped mode overrides the shared mode for queue 1, and SRR services this queue in shaped mode.

• If the egress expedite queue is disabled and the SRR shaped weights are not configured, SRR

services this queue in shared mode.

Allocating Buffer Space to and Setting WTD Thresholds for an Egress Queue-Set

You can guarantee the availability of buffers, set WTD thresholds, and configure the maximum

allocation for a queue-set by using the mls qos queue-set output qset-id threshold queue-id

drop-threshold1 drop-threshold2 reserved-threshold maximum-threshold global configuration command.

Each threshold value is a percentage of the queue’s allocated buffers, which you specify by using the mls

qos que

ue-set output qset-id buffers allocation1 ... allocation4 global configuration command. The

queues use WTD to support distinct drop percentages for different traffic classes.

Note The egress queue default settings are suitable for most situations. You should change them only when

you have a thorough understanding of the egress queues and if these settings do not meet your QoS

solution.

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