HP 5300XL, 5304XL, 5348XL manual 391

								Quality of Service (QoS): Managing Bandwidth More Effectively
											Introduction
N o t e :					If you are not using multiple tagged VLANs in your network, you can
					still use the tagged VLAN feature by configuring the default VLAN as
					a tagged VLAN.
			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 15-2.				QoS Priority Settings and Operation
				QoS Priority			Outbound Port
				Setting			Queue
				1 - 2			low priority
		0 - 3					normal priority
		4 - 5					medium priority
		6 - 7					high priority
			If a packet is not in an 802.1Q tagged VLAN environment, then the above QoS
			settings (table 15-2) control only to which outbound queue the packet goes,
			and no 802.1p priority is added to the packet for use by downstream devices.
			But if the packet is in an 802.1Q tagged VLAN environment, then the above
			setting is also added to the packet as an 802.1p priority that can be used by
			downstream devices and applications, as indicated in the next table. In either
			case, an IP packet can also carry a prioritization policy to downstream devices
			by using codepoint-marking in the ToS byte.
Table 15-3. Mapping Series 5300XL QoS Priority Settings to Device Queues
	Priority Setting	Outbound Port				802.1p Priority Setting			Queue Assignment in Downstream Devices With:
	in the Series	Queues in the				Added to Tagged VLAN			8 Queues	3 Queues	2 Queues
	5300XLSwitches	Series 5300XL				Packets Leaving the Switch
		Switches
	1	Queue 1					1	(low priority)	Queue 1	Queue 1
2							2		Queue 2		Queue 1
0									Queue 3
		Queue 2					0	(normal priority)		Queue 2
3							3		Queue 4
4									Queue 5
		Queue 3					4	(medium priority)		Queue 3
5							5		Queue 6		Queue 2
6									Queue 7
		Queue 4					6	(high priority)
7							7		Queue 8

15-7