HP 6120XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management G - Page 209
Assigning a DSCP Policy on the Basis of the DSCP in IPv4 Packets Received from Upstream Devices
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Quality of Service (QoS): Managing Bandwidth More Effectively Using QoS Classifiers To Configure Quality of Service 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 5-51.) 3. Use qos type-of-service diff-services < incoming-DSCP > dscp < outgoingDSCP > to change the policy on packets coming from the edge or upstream switch with the specified incoming DSCP. (Figure 5-10 on page 5-29 illustrates this scenario.) 5-33