HP ProCurve 5300xl Series Management Manual page 282

Quality of Service (QoS): Managing Bandwidth More Effectively
Introduction
Table 8-3. Mapping Series 5300XL and 3400cl/6400cl QoS Priority Settings to Device Queues
Priority Setting Outbound Port
in thitherto Queues in the
Switch
1 Queue 1
2
0 Queue 2
3
4 Queue 3
5
6 Queue 4
7
8-8
You can configure a QoS priority of 0 through 7 for an outbound packet. When
the packet is then sent to a port, the QoS priority determines which outbound
queue the packet uses:
Table 8-2. QoS Priority Settings and Operation
QoS Priority Setting Outbound Port Queue
1 - 2 low priority
0 - 3 normal priority
4 - 5 medium priority
6 - 7 high priority
If a packet is not in a VLAN-tagged port environment, then the QoS settings in
table 8-2 control only to which outbound queue the packet goes. Without VLAN
tagging, no 802.1p priority is added to the packet for downstream device use.
But if the packet is in a VLAN-tagged environment, then the above setting is
also added to the packet as an 802.1p priority for use by downstream devices
and applications (shown in table 8-3). In either case, an IP packet can also
carry a priority policy to downstream devices by using DSCP-marking in the
ToS byte.
802.1p Priority Setting Added
to Tagged VLAN Packets
Leaving the Switch
1 (low priority)
2
0 (normal priority)
3
4 (medium priority)
5
6 (high priority)
7
Queue Assignment in Downstream Devices With:
8 Queues 3 Queues
Queue 1 Queue 1
Queue 2
Queue 3 Queue 2
Queue 4
Queue 5 Queue 3
Queue 6
Queue 7
Queue 8
2 Queues
Queue 1
Queue 2