Chapter 21 Bandwidth Management
EMG6765-Q10A User’s Guide
152
are eight classes of services (ranging from zero to seven) in IP precedence. Zero is the lowest priority
level and seven is the highest.
Automatic Priority Queue Assignment
If you enable QoS on the EMG6765-Q10A, the EMG6765-Q10A can automatically base on the IEEE
802.1p priority level, IP precedence and/or packet length to assign priority to traffic which does not
match a class.
The following table shows you the internal layer-2 and layer-3 QoS mapping on the EMG6765-Q10A. On
the EMG6765-Q10A, traffic assigned to higher priority queues gets through faster while traffic in lower
index queues is dropped if the network is congested.
Table 68 Internal Layer2 and Layer3 QoS Mapping
PRIORITY
QUEUE
LAYER 2
LAYER 3
IEEE 802.1P USER
PRIORITY
(ETHERNET
PRIORITY)
TOS (IP
PRECEDENCE)
DSCP
IP PACKET LENGTH
(BYTE)
0
1
0
000000
1
2
2
0
0
000000
>1100
3
3
1
001110
001100
001010
001000
250~1100
4
4
2
010110
010100
010010
010000
5
5
3
011110
011100
011010
011000
<250
6
6
4
100110
100100
100010
100000
5
101110
101000
7
7
6
110000
111000
7
Содержание EMG6765-Q10A
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