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Use of Label Switching on Frame Relay Networks Specification (RFC3034)

IP.com Disclosure Number: IPCOM000005226D
Original Publication Date: 2001-Jan-01
Included in the Prior Art Database: 2001-Aug-17
Document File: 25 page(s) / 53K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

A. Conta: AUTHOR [+3]

Abstract

This document defines the model and generic mechanisms for Multiprotocol Label Switching on Frame Relay networks. Furthermore, it extends and clarifies portions of the Multiprotocol Label Switching Architecture described in [ARCH] and the Label Distribution Protocol (LDP) described in [LDP] relative to Frame Relay Networks. MPLS enables the use of Frame Relay Switches as Label Switching Routers (LSRs).

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Network Working Group A. Conta Request for Comments: 3034 Transwitch Corporation Category: Standards Track P. Doolan Ennovate

A. Malis Vivace Networks, Inc.

January 2001

Use of Label Switching on Frame Relay Networks

Specification

Status of this Memo

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2001). All Rights Reserved.

Abstract

This document defines the model and generic mechanisms for Multiprotocol Label Switching on Frame Relay networks. Furthermore, it extends and clarifies portions of the Multiprotocol Label Switching Architecture described in [ARCH] and the Label Distribution Protocol (LDP) described in [LDP] relative to Frame Relay Networks. MPLS enables the use of Frame Relay Switches as Label Switching Routers (LSRs).

Table of Contents

1. Introduction................................................2 2. Terminology.................................................3 3. Special Characteristics of Frame Relay Switches.............4 4. Label Encapsulation.........................................5 5. Frame Relay Label Switching Processing......................6 5.1 Use of DLCIs..............................................6 5.2 Homogeneous LSPs..........................................7 5.3 Heterogeneous LSPs........................................7 5.4 Frame Relay Label Switching Loop Prevention and Control...7 5.4.1 FR-LSRs Loop Control MPLS TTL Processing.............7 5.4.2 Performing MPLS TTL calculations.......................8 5.5 Label Processing by Ingress FR-LSRs......................12

Conta, et al. Standards Track [Page 1]

RFC 3034 Label Switching with Frame Relay January 2001

5.6 Label Processing by Core FR-LSRs.........................12 5.7 Label Processing by Egress FR-LSRs.......................13 6. Label Switching Control Component for Frame Relay.........13 6.1 Hybrid Switches (Ships in the Night) ...................14 7. Label Allocation and Maintenance Procedures ..............15 7.1 Edge LSR Behavior........................................15 7.2 Efficient use of label space-Merging FR-LSRs.............18 7.3 LDP message fields specific to Frame Relay...............19 8. Security Considerations .................................21 9. Acknowledgments .........................................21 10. References ..............................................22 11. Authors' Addresses ......................................23 12. Full Copyright Statement ................................24

1. Introduction

The Multiprotocol Label Switching Architecture is...