Browse Prior Art Database

Native ATM Support for ST2+ (RFC1946)

IP.com Disclosure Number: IPCOM000004175D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 17 page(s) / 47K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

S. Jackowski: AUTHOR

Abstract

As the demand for networked realtime services grows, so does the need for shared networks to provide deterministic delivery services. Such deterministic delivery services demand that both the source application and the network infrastructure have capabilities to request, setup, and enforce the delivery of the data. Collectively these services are referred to as bandwidth reservation and Quality of Service (QoS).

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 6% of the total text.

Network Working Group S. Jackowski

Request for Comments: 1946 NetManage Incorporated

Category: Informational May 1996

Native ATM Support for ST2+

Status of This Memo

This memo provides information for the Internet community. This memo

does not specify an Internet standard of any kind. Distribution of

this memo is unlimited.

Abstract

As the demand for networked realtime services grows, so does the need

for shared networks to provide deterministic delivery services. Such

deterministic delivery services demand that both the source

application and the network infrastructure have capabilities to

request, setup, and enforce the delivery of the data. Collectively

these services are referred to as bandwidth reservation and Quality

of Service (QoS).

The IETF is currently working on an integrated services model to

support realtime services on the Internet The IETF has not yet

focused on the integration of ATM and its inherent QoS and bandwidth

allocation mechanisms for delivery of realtime traffic over shared

wires. (ATM hardware and interfaces provide the network

infrastructure for the determinitic data delivery, however the host

resident protocol stacks and applications need more attention.)

Current IETF efforts underway in the IP over ATM (ipatm) working

group rely on intserv, rsvp and ST2 to address QoS issues for ATM. As

such, RFC 1577 and the ATM Forum's Lan Emulation do not provide

direct QoS and bandwidth allocation capabilities to network

applications. Without providing a mapping of reservations-style QoS

to ATM signalling, ATM will remain a 'wire' rather than a shared

media infrastructure component.

This memo describes a working implementation which enables

applications to directly invoke ATM services in the following

environments:

- ATM to internet,

- internet to ATM, and

- internet to internet across ATM.

Table of Contents

1.0 Introduction...............................................2

2.0 ST-2 and ST-2+.............................................5

3.0 Implementation Issues for Reservations over ATM............6

3.1 Addressing.................................................6

3.2 Changes to Bandwidth and QoS...............................6

3.3 Multicasting...............................................7

3.4 Receiver Initiated JOIN Requests to Multicast Groups.......8

3.5 Computation of QoS Parameters..............................8

3.6 Use of HELLOs..............................................9

4.0 Reservation Signalling with ATM............................9

4.1 Embedded Reservation Signalling within Q.2931.............10

4.2 In-Band Reservation Signalling............................11

4.3 Dedicated Virtual Circuits for Reservation Signalling.....12

4.4 Reservation Si...