ProCurve 2610-PWR Technical Information download pdf (Page 230)

Quality of Service (QoS): Managing Bandwidth More Effectively

Using QoS Classifiers To Configure QoS for Outbound Traffic

Assigning a DSCP Policy on the Basis of the DSCP

in IPv4 Packets Received from Upstream Devices

The preceding section describes how to forward a policy set by an edge (or

upstream) switch. This option changes a DSCP policy in an IPv4 packet by

changing its IP ToS codepoint and applying the priority associated with the

new codepoint. (A DSCP policy consists of a differentiated services codepoint

and an associated 802.1p priority.) You can use this option concurrently with

the diffserv 802.1p priority option (above), as long as the DSCPs specified in

the two options do not match.

To use this option to configure a change in policy:

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

or edge switch.

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

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

the DSCP the packet carries from upstream. (For more on this topic, refer

to “Differentiated Services Codepoint (DSCP) Mapping” on page 6-58.)

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

DSCP > to change the policy on packets coming from the edge or upstream

switch with the specified incoming DSCP.

(Figure 6-15 on page 6-36 illustrates this scenario.)

Notes On switches covered in this guide, “mixing” ToS DSCP policies and 802.1p

priorities is not recommended. Refer to the Note on page 6-10.

Syntax: qos type-of-service diff-services

Enables ToS diff-services.

qos type-of-service diff-services < current-codepoint > dscp

< new-codepoint >

Configures the switch to select an incoming IP packet

carrying the <current-codepoint > and then use the <new-

codepoint> to assign a new, previously configured DSCP

policy to the packet. The policy overwrites the <current-

codepoint> with the < new-codepoint > and assigns the 802.1p

priority specified by the policy. (Use the

qos dscp-map

command to define the priority for the DSCPs—page 6-58.)

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ProCurve 2610-PWR Technical Information Page 230