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Qos Levels; Using 802.1p Priorities To Provide Qos - HP 438031-B21 - 1:10Gb Ethernet BL-c Switch Application Manual

Hp 1:10gb ethernet bl-c switch for c-class bladesystem application guide.
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Class Selector (CS)—This PHB has eight priority classes, with CS7 representing the highest priority,
and CS0 representing the lowest priority, as shown below. CS PHB is described in RFC 2474.
Class selector priority classes
Table 18
Priority
Highest
Lowest

QoS levels

The following table shows the default service levels provided by the switch, listed from highest to lowest
importance:
Table 19
Default QoS service levels
Service Level
Critical
Network Control
Premium
Platinum
Gold
Silver
Bronze

Using 802.1p priorities to provide QoS

The HP 1:10GbE switch software provides Quality of Service functions based on the priority bits in a
packet's VLAN header. (The priority bits are defined by the 802.1p standard within the IEEE 802.1q
VLAN header.) The 802.1p bits, if present in the packet, specify the priority given to packets during
forwarding. Packets with a numerically higher (non-zero) priority are given forwarding preference over
packets with lower priority.
Packets with a priority mapped to a higher Class of Service (COS) and COS queue (COSq) weight are
given forwarding preference over packets with priority mapped to a lower COS and COSq weight. The
scheduling scheme is Weight Round Robin (WRR), with user-configurable weight from 0 to 15 for a
COSq. The switch can be configured with either two or eight output Class of Service queues (COSq).
Class Selector
CS7
CS6
CS5
CS4
CS3
CS2
CS1
CS0
Default PHB
CS7
CS6
EF, CS5
AF41, AF42, AF43, CS4
AF31, AF32, AF33, CS3
AF21, AF22, AF23, CS2
AF11, AF12, AF13, CS1
Quality of Service
DSCP
56
48
40
32
24
16
8
0
802.1p Priority
7
6
5
4
3
2
1
96

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