User's Manual

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SMCD3GN2 Wireless Cable Modem Gateway Administrator Manual

To configure DSCP remarking settings:

1. Check Enable DSCP Remarking.

2. Complete the options in the menu and refer to Table 12.

3. When you finish, click Apply.

Table 12. DSCP Remarking Options

Option Description

Dscp remarking mode Lets you select the DSCP remarking mode that the Gateway is to use. Choices are:

• Map frame priority to AF code points = select this option for Quality of Service configurations that use

assured forwarding (AF) code points to mark packets. AF guarantees a certain amount of bandwidth to

an AF class and allows access to extra bandwidth, if available. (default)

• Map frame priority to CS code points = select this option for Quality of Service configurations that use

class selector (CS) code points to mark packets. CS provides code points that can be used for

backward compatibility with IP Precedence. IP Precedence is a legacy technology that the Gateway

supports for backwards compatibility.

Request a remarking action when DSCP equals one of the following CPs

Expedited Forwarding

Code Point

Expedited forwarding provides a low-loss, low-latency, low-jitter, and assured bandwidth service.

Applications such as VoIP, video, and other time sensitive applications require a robust network treatment

like expedited forwarding. When checked, the Gateway requests a remarking action if DSCP equals an

expedited forwarding code point. By default, this option is not checked.

Assured Forwarding

Code Points

Assured forwarding defines a method by which packets can be given different forwarding assurances.

Traffic can be divided into different classes and then each class given a certain percentage of bandwidth.

For example, one class could have 50% of the available link bandwidth, another class could have 30%,

and another 20% of the bandwidth. When checked, the Gateway requests a remarking action if DSCP

equals an assured forwarding code point. By default, this option is not checked.

Class Selector Code

Points

Class Selector code points are code points that can be used for backward compatibility with IP Precedence

models. When checked, lets the Gateway request a remarking action if DSCP equals a class selector code

point. By default, this option is checked, but does not take effect until the OSPF Status changes to

ENABLE.

Zero When checked, lets the Gateway request a remarking action if DSCP equals zero. By default, this option is

checked, but does not take effect until the OSPF Status changes to ENABLE.

Others When checked, lets the Gateway request a remarking action if DSCP equals a non-zero value. By default,

this option is checked, but does not take effect until the OSPF Status changes to ENABLE.