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## Related Documentation

- Configuring IP Parameters for SAToP Bundles (CTP Menu)
- Configuring IP Parameters for SAToP Bundles (CTPView)

# Providing QoS for SAToP 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 transverses 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 circuit 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

## Related Documentation

- Configuring IP Parameters for SAToP Bundles (CTP Menu)
- Configuring IP Parameters for SAToP Bundles (CTPView)

#### Published: 2010-10-21

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