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5-48

Quality of Service: Managing Bandwidth More Effectively

Globally-Configured QoS

Assigning a DSCP Policy for a Global IP-Diffserv Classifier

The preceding section describes how to forward an 802.1p priority level set

by an edge (or upstream) switch. This section describes how to use a global

IP-Diffserv classifier to mark matching packets with a new DSCP policy. A

DSCP policy consists of a DSCP codepoint and an associated 802.1p priority.

You can use a global IP-Diffserv classifier to mark a DSCP policy at the same

time with a global IP-Diffserv classifier that marks an 802.1p priority if

different DSCP codepoints are configured with each classifier.

To use a global IP-Diffserv classifier to mark matching packets with a new

DSCP policy, follow these steps:

1. Identify the DSCP used to set a policy in packets received from an

upstream or edge switch.

2. Create a new policy by using the qos dscp-map < codepoint > priority < 0 - 7>

command to configure an 802.1p priority for the codepoint you will use

to overwrite the DSCP that the packet carries from upstream. (For more

information, see “Differentiated Services Codepoint (DSCP) Mapping” on

page 5-90.)

3. Use the qos type-of-service diff-services < incoming-DSCP > dscp < outgoing-

DSCP > command to change the policy on packets coming from the edge

or upstream switch with the specified incoming DSCP.

Figure 5-15 on page 5-44 illustrates this scenario.

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