HP ProCurve Series 6120 Blade Switches Advanced Traffic Management Guide

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Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
Figure 5-10. Interior Switch “B” Honors the Policy Established in Edge Switch “A”
To do so, assign the desired 802.1p priority to the same codepoint that the
upstream or edge switch assigns to the selected packets. When the down-
stream switch receives an IPv4 packet carrying one of these codepoints, it
assigns the configured priority to the packet and sends it out the appropriate
priority queue. (The packet retains the codepoint it received from the
upstream or edge switch). You can use this option concurrently with the
diffserv DSCP Policy option (described later in this section), as long as the
DSCPs specified in the two options do not match.
LAN
A5
Edge
Switch
“A”
LAN
Interior
Switch
“B”
Work-
Group
Work-
Group
Marked Traffic from port A5 on Edge Switch “A”
Other Traffic