2 using tos, dscp or precedence, Introduction, Tosmarking – RCA THOMSON SpeedTouchTM (Wireless) Business DSL Router User Manual

Page 40: Precedence, Using tos, dscp or precedence, Chapter 5

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Chapter 5

Packet Classification and Labelling

E-NIT-CTC-20041213-0013 v0.5

38

5.2.2 Using TOS, DSCP or Precedence

Introduction

In this section we will explain the parameters that need to be set to enable QoS
throughout the entire network. This means that these values are only of significance
for outgoing fraffic. The tables below describe the values used when configuring
IPQoS by setting the TOS byte, using DSCP or by setting the Precedence bits.

TOSmarking

When using TOS a very fine definition of the Quality of Service can be made. This is
only of use when the whole network supports QoS by TOS.

TOS

Precedence

When using Precedence the QoS definition is narrowed down to 8 values

!

Only one

type of of IPQoS can be used at the time.

TOSmarking values

Discription

disable

Disables the TOS marking.

enable

Enables the TOS marking.

TOS values

Description

1..255

Sets the TOS bits in the IP header to the coresponding
value.

Precedence values

Description

routine

will set the precedence bits to 000.

(lowest

priority)

priority

will set the precedence bits to 001.

immediate

will set the precedence bits to 010.

flash

will set the precedence bits to 011.

flash-override

will set the precedence bits to 100.

CRITIC-ECP

will set the precedence bits to 101.

internetwork-control

will set the precedence bits to 110.

network-control

will set the precedence bits to 111.

(highest priority)

number 0..7

0..7.

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