HP 1920 Gigabit Ethernet Switch Series User Manual

471
Figure 457 802.1Q tag header
Table 147 Description on 802.1p priority
802.1
p
p
riorit
y
(decimal) 802.1
p
p
riorit
y
(binar
y
) Descri
p
tion
0 000 best-effort
1 001 background
2 010 spare
3 011 excellent-effort
4 100 controlled-load
5 101 video
6 110 voice
7 111 network-management
Queue scheduling
In general, congestion management uses queuing technology. The system uses a certain queuing
algorithm for traffic classification, and then uses a certain precedence algorithm to send the traffic. Each
queuing algorithm handles a particular network traffic problem and has significant impacts on
bandwidth resource assignment, delay, and jitter.
In this section, two common hardware queue scheduling algorithms Strict Priority (SP) queuing and
Weighted Round Robin (WRR) queuing are introduced.
SP queuing
SP queuing is designed for mission-critical applications, which require preferential service to reduce
response delay when congestion occurs.
1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 Priority VLAN ID
TPID (Tag protocol identifier) TCI (Tag control information)
Byte 1 Byte 2
0
Byte 3 Byte 4
CFI
7 5432107 5432106 6 7 5432107 54321066

HP 1920 Gigabit Ethernet Switch Series Specifications

General

Brand	HP
Model	1920 Gigabit Ethernet Switch Series
Category	Switch
Language	English