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Advanced Configuration and Management Guide
• You can classify packets and assign them to specific queues based on the following criteria:
• Incoming port (sometimes called ingress port)
• IP source and destination addresses
• Layer 4 source and destination information (for all IP addresses or specific IP addresses)
• Static MAC entry
• AppleTalk socket number
• Layer 2 port-based VLAN membership
• 802.1q tag
By default, all the traffic types listed above except the 802.1q tagged packets are in the best effort queue, which is
the lowest priority queue. The 802.1q tagged packets are assigned to a queue based on the priority level (0 – 7)
in the packet’s tag. The default mapping of the priority levels to the queues is as follows.
Priority Level Queue
6, 7 qosp3
4, 5 qosp2
2, 3 qosp1
0, 1 qosp0
In cases where a packet matches more than one traffic type, the highest queue level among the traffic type is
used. For example, if a tagged packet arrives on a tagged port and the 802.1p priority is 4 (qosp2) but the packet
contains IP source and destination information that matches an IP access policy configured to assign the traffic to
priority 7 (qosp3), the device places the packet in qosp3 of the outbound port.
Automatic Queue Mapping for IP Type Of Service (TOS) Values
HP devices that support QoS automatically examine the first two bits in the Type of Service (TOS) header in each
IP packet as it enters the device on a 10/100 port. The device then places the packet in the QoS queue that
corresponds to the TOS value.
The TOS value in the first two bits can be one of the following.
TOS value (binary) Queue
11 qosp3
10 qosp2
01 qosp1
00 qosp0
As the packet moves through the system, if the packet matches other QoS allocations you have configured, the
packet is moved into a higher queue accordingly. For example, if the TOS values place the packet in qosp1, but
the packet is part of a port-based VLAN that is in qosp3, the packet enters queue qosp3. Packets can enter
higher queues but never enter lower queues as they move through the system.
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