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
Table 5-8. ToS IP-Precedence Bit Mappings to 802.1p Priorities
Assigning a Priority Based on Layer-3 Protocol
When QoS on the switch is configured with a Layer-3 protocol as the highest-
precedence classifier and the switch receives traffic carrying that protocol,
then this traffic is assigned the priority configured for this classifier. (For
operation when other QoS classifiers apply to the same traffic, refer to
“Classifiers for Prioritizing Outbound Packets” on page 5-10.)
IP Packet Sent Out
an Untagged Port
in a VLAN
Same as above, plus the IP Prece-
dence value (0 - 7) will be used to set
a corresponding 802.1p priority in the
VLAN tag carried by the packet to the
next downstream device. Refer to
table 5-8, below.
Same as above, plus the Priority value (0 - 7) will be used to
set a corresponding 802.1p priority in the VLAN tag carried by
the packet to the next downstream device. Where No-over-
ride is the assigned priority, the VLAN tag carries a “0” (normal
priority) 802.1p setting if not prioritized by other QoS classi-
fiers.
Outbound Port ToS Option:
802.1p (Value = 0 - 7) Differentiated Services
ToS Byte IP
Precedence Bits
Corresponding
802.1p Priority
Service Priority Level
000 1 Lowest
001 2 Low
002 0 Normal
003 3
004 4
005 5
006 6
007 7 Highest