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DSCP to Queue
The DSCP (IP Differentiated Services Code Point) to Queue page maps DSCP values to egress
queues. The DSCP to Queue Table determines the egress queues of the incoming IP packets
based on their DSCP values. The original VPT (VLAN Priority Tag) of the packet is unchanged.
By simply changing the DSCP to Queue mapping and the Queue schedule method and bandwidth
allocation, it is possible to achieve the desired quality of services in a network.
The DSCP to Queue mapping is applicable to IP packets if the device is in QoS Basic mode and
DSCP is the trusted mode. Non-IP packets are always classified to the best-effort queue.
The following tables describe the default DSCP to queue mapping:
DSCP
63
55
47
39
31
23
15
7
Queue
3
3
4
3
3
2
1
1
DSCP
62
54
46 (EF)
38 (AF3)
30 (AF33)
22(AF23)
14
6
Queue
3
3
4
3
3
2
1
1
DSCP
61
53
45
37
29
21
13
5
Queue
3
3
4
3
3
2
1
1
DSCP
60
52
44
36(AF42)
28(AF32)
20(AF22)
12(AF12)
4
Queue
3
3
4
3
3
2
1
1
DSCP
59
51
43
35
27
19
11
3
Queue
3
3
4
3
3
2
1
1
DSCP
58
50
42
34(AF41)
26(AF31)
18(AF21)
10(AF11)
2
Queue
3
3
4
3
3
2
1
1
DSCP
57
49
41
33
25
17
9
1
Queue
3
3
4
3
3
2
1
1
DSCP
56(CS7)
48(CS6)
40(CS5)
32(CS4)
24(CS3)
16(CS2)
8(CS1)
0(BE)
Queue
3
3
4
3
3
2
1
1
The queue 4 is the highest queue and the default classes in the parentheses are defined by IETF.
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