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IP Precedence
Similar to IEEE 802.1p prioritization at layer-2, you can use IP precedence to prioritize packets in a
layer-3 network. IP precedence uses three bits of the eight-bit ToS (Type of Service) field in the IP
header. There 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 VMG, the VMG 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 VMG. On the
VMG, traffic assigned to higher priority queues gets through faster while traffic in lower index
queues is dropped if the network is congested.
Table 52 Internal Layer2 and Layer3 QoS Mapping
LAYER 2
PRIORITY
IEEE 802.1P USER
QUEUE
PRIORITY
(ETHERNET
PRIORITY)
0
1
1
2
2
0
3
3
4
4
5
5
6
6
7
7
Chapter 10 Quality of Service (QoS)
LAYER 3
TOS (IP
PRECEDENCE)
0
0
1
2
3
4
5
6
7
VMG1312-Bx0D User's Guide
152
IP PACKET
DSCP
LENGTH (BYTE)
000000
000000
>1100
001110
250~1100
001100
001010
001000
010110
010100
010010
010000
011110
<250
011100
011010
011000
100110
100100
100010
100000
101110
101000
110000
111000
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