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Nortel's Virtual Network Switching (VNS) Overview (RFC2340)

IP.com Disclosure Number: IPCOM000002909D
Original Publication Date: 1998-May-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 11 page(s) / 29K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Jamoussi: AUTHOR [+4]

Abstract

This document provides an overview of Virtual Network Switching (VNS).

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 10% of the total text.

Network Working Group B. Jamoussi

Request for Comments: 2340 D. Jamieson

Category: Informational D. Williston

S. Gabe

Nortel (Northern Telecom) Ltd.

May 1998

Nortel's Virtual Network Switching (VNS) Overview

Status of this Memo

This memo provides information for the Internet community. It does

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

memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (1998). All Rights Reserved.

Abstract

This document provides an overview of Virtual Network Switching

(VNS).

VNS is a multi-protocol switching architecture that provides COS-

sensitive packet switching, reduces the complexity of operating

protocols like PPP and frame relay, provides logical networks and

traffic segregation for Virtual Private Networks (VPNs), security and

traffic engineering, enables efficient WAN broadcasting and

multicasting, and reduces address space requirements. VNS reduces the

number of routing hops over the WAN by switching packets based on

labels.

VNS has been proven in production networks for several years.

Table of Contents

1 Introduction ............................................ 2

2 What is VNS? ............................................ 3

3 VNS Header ............................................. 5

4 VNS Label Distribution .................................. 7

5 Logical Networks (LNs) .................................... 7

6 VNS Routing ............................................. 8

7 VNS Forwarding .......................................... 9

7.1 Unicast ................................................ 9

7.2 Multicast .............................................. 9

8 Traffic Engineering ..................................... 10

8.1 Equal Cost Multipaths .................................. 10

8.2 Trunk Load Spreading ................................... 10

9 Class of Service ........................................ 11

10 VNS Migration Strategies ................................ 11

11 Summary ................................................. 11

12 Security Considerations ................................. 12

13 Acknowledgments ......................................... 12

14 Authors' Addresses ...................................... 13

15 Full Copyright Statement ................................ 14

1. Introduction

There are several key problem areas with today's wide area backbone

networks that carry LAN traffic: scalability, service

differentiation, redundancy, administration, and traffic containment.

First, scal...