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    Providing QoS for VComp Bundles by Using Service Type Overview

    In IP networks, the IP flow is typically classified based on the Differentiated Services Code Point (DSCP) setting in the type of service (TOS) byte of the IP header. DSCP is a scalable solution for classifying flows in a large IP network based on the class of service desired on specific IP traffic flows.

    With the CTP device, you can configure DSCP settings for each circuit’s IP flow. For example, some circuits could be configured for the expedited forwarding (EF) class. When the network routers receive this EF-marked flow from the CTP device, they place the marked traffic into a high-priority queue, enabling this traffic to be serviced before lower-priority traffic. As an EF-marked flow traverses the IP network, routers can use its classification to provide the flow a more predictable level of performance across the network.

    When you configure the service type of a bundle, you specify the ToS byte to be used in IP headers of packets sent from the CTP device to the IP network. The ToS setting is applied to circuits created by the bundle for which the service type is configured.

    Table 1 shows the mapping for each DSCP class and setting to the ToS setting that you configure as the service type for a bundle. The expedited forwarding (EF) class (ToS setting 184) is commonly used for voice traffic.

    Table 1: DSCP Classes and Service Type

    DSCP Class DSCP Setting ToS Setting

    CS7

    56

    224

    CS6

    48

    192

    EF

    46

    184

    CS5

    40

    160

    AF43

    38

    152

    AF42

    36

    144

    AF41

    34

    136

    CS4

    32

    128

    AF33

    30

    120

    AF32

    28

    112

    AF31

    26

    104

    CS3

    24

    96

    AF23

    22

    88

    AF22

    20

    80

    AF21

    18

    72

    CS2

    16

    64

    AF13

    13

    52

    AF12

    12

    48

    AF11

    10

    40

    CS1

    8

    32

    Modified: 2013-07-10