Linksys LGS326P

186
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.