Differentiated Services in the Internet

Writer： BrianE.Carpenter and Kathleen Nichols

Presenter：杨大生

Background

Wireline telephone network and packet switching network

Previous Qos approaches • IP precedence and type of service• ST• Integrated services

A Fresh approach

Motivating Diffserv’ s Approach

• Objective of Qos

• Control of resources

• Basic Mechanisms of Forwarding

• Building end-to-end services

• Quantifying

Diffserv: Fitting An Architectural Framework to the Internet (1)

• 1 Overview

• 2 Separation of Control

and Forwarding

Diffserv: Fitting An Architectural Framework to the Internet (2)

• 3 Defining the Forwarding Path Primitives

• Basic Requirement• Diffserv’s Mark• Using the Mark

Diffserv: Fitting An Architectural Framework to the Internet (3)

• 4 Control Plane Options• Cloud-Based QoS Control• ConnectingNetworkClouds

PDBs: Structuring Aggregates To Meet Expectations

• Each PDB has measurable, quantifiable attributes that can be used to describe what happens to its packets as they enter and cross the DSdomain.

Requirements For Allocation And Configuration(1)

• ControlPlaneFunctionality• Time Scale Differences• Static Versus Dynamic• Allocation

Requirements For Allocation And Configuration(2)

• GeneralComponents• Host• Network Cloud• Allocator• EdgeRouter

• Request

Thank You!