HP 6120XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management G - Page 214

Quality of Service (QoS): Managing Bandwidth More Effectively Using QoS Classifiers To Configure Quality of Service for Outbound Traffic Outbound Port ToS Option: 802.1p (Value = 0 - 7) Differentiated Services IP Packet Sent Out Same as above, plus the IP Prece- Same as above, plus the Priority value (0 - 7) will be used to an Untagged Port dence value (0 - 7) will be used to set set a corresponding 802.1p priority in the VLAN tag carried by in a VLAN a corresponding 802.1p priority in the the packet to the next downstream device. Where No-over- VLAN tag carried by the packet to the ride is the assigned priority, the VLAN tag carries a "0" (normal next downstream device. Refer to priority) 802.1p setting if not prioritized by other QoS classi- table 5-8, below. fiers. Table 5-8. ToS IP-Precedence Bit Mappings to 802.1p Priorities ToS Byte IP Corresponding Service Priority Level Precedence Bits 802.1p Priority 000 1 Lowest 001 2 Low 002 0 Normal 003 3 004 4 005 5 006 6 007 7 Highest Assigning a Priority Based on Layer-3 Protocol When QoS on the switch is configured with a Layer-3 protocol as the highestprecedence 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.) 5-38