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39-11

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

OL-21521-01

Chapter 39 Configuring QoS

Understanding QoS

Figure 39-4 Policing and Marking Flowchart on Physical Ports

Policing on SVIs

Note Before configuring a hierarchical policy map with individual policers on an SVI, you must enable

VLAN-based QoS on the physical ports that belong to the SVI. Though a policy map is attached to the

SVI, the individual policers only affect traffic on the physical ports specified in the secondary interface

level of the hierarchical policy map.

A hierarchical policy map has two levels. The first level, the VLAN level, specifies the actions to be

taken against a traffic flow on an SVI. The second level, the interface level, specifies the actions to be

taken against the traffic on the physical ports that belong to the SVI and are specified in the

interface-level policy map.

86835

Ye s

Pass

through Drop

Mark

Get the clasification

result for the packet.

Is a policer configured

for this packet?

Check if the packet is in

profile by querying the policer.

Check out-of-profile action

configured for this policer.

Drop packet.

Modify DSCP according to the

policed-DSCP map. Generate

a new QoS label.

Start

Done

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