Integrated Services

 

 

نوع فایل: PowerPoint

تعداد اسلاید (ها): 43

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چکیده ای از متن:

Limitations of IP Architecture in Supporting Resource Management

● IP provides only best effort service

● IP does not participate in resource management

- Cannot provide service guarantees on a per flow basis

- Cannot provide service differentiation among traffic aggregates

● Early efforts - Tenet group at Berkeley (Ferrari and Verma) - ATM

● IETF efforts - Integrated services initiative - Differentiated services initiative

Integrated Services Network

● Flow or session as QoS abstractions

● Each flow has a fixed or stable path

● Routers along the path maintain the state of the flow

Integrated Services Example

● Achieve per-flow bandwidth and delay guarantees

- Example: guarantee 1MBps and < 100 ms delay to a flow

Integrated Services Example

● Allocate resources - perform per-flow admission control

Integrated Services Example

● Install per-flow state

Integrated Services Example

● Install per flow state

Service Classes

● Multiple service classes

● Service can be viewed as a contract between network and communication client

- end-to-end service

- other service scopes possible

● Three common services

- best-effort (“elastic” applications)

- hard real-time (“real-time” applications)

- soft real-time (“tolerant” applications)

Table of contents:

Limitations of IP Architecture in Supporting Resource Management

Integrated Services Network

Integrated Services Example

Integrated Services Example: Data Path

Integrated Services Example

How Things Fit Together

Service Classes

Role of RSVP in the Architecture

RSVP Design Features

The following slides are optional. You may read it yourself

The Big Picture

RSVP Basic Operations

Route Pinning

PATH and RESV messages

Token Bucket

Next slides are optional (you can continue by yourself)

End-to-End Reservation

Per-hop Reservation

Reservation Style

Reservation Styles and Filter Spec

Wildcard Filter Example

Wildcard Filter

Wildcard Filter: Inefficient Resource Utilization Example

Fixed Filter Example

Dynamic Filter Example

Tire-down Example

Fixed Filter Example

Soft State

RSVP and Routing

Recap of RSVP

Question

What is still Missing?

The End

 

 

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