Encapsulation Methods for Transport of Asynchronous Transfer Mode (ATM) over MPLS Networks
RFC 4717
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RFC - Proposed Standard
(December 2006; Errata)
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Last updated |
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2020-01-21
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IETF
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plain text
html
pdf
htmlized
with errata
bibtex
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Reviews |
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WG state
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(None)
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Document shepherd |
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No shepherd assigned
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IESG state |
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RFC 4717 (Proposed Standard)
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Consensus Boilerplate |
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Unknown
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Telechat date |
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Responsible AD |
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Mark Townsley
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Send notices to |
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danny@tcb.net, stbryant@cisco.com
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Network Working Group L. Martini
Request for Comments: 4717 J. Jayakumar
Category: Standards Track Cisco Systems, Inc.
M. Bocci
Alcatel
N. El-Aawar
Level 3 Communications, LLC
J. Brayley
ECI Telecom Inc.
G. Koleyni
Nortel Networks
December 2006
Encapsulation Methods for Transport of
Asynchronous Transfer Mode (ATM) over MPLS Networks
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 IETF Trust (2006).
Abstract
An Asynchronous Transfer Mode (ATM) Pseudowire (PW) is used to carry
ATM cells over an MPLS network. This enables service providers to
offer "emulated" ATM services over existing MPLS networks. This
document specifies methods for the encapsulation of ATM cells within
a pseudowire. It also specifies the procedures for using a PW to
provide an ATM service.
Martini, et al. Standards Track [Page 1]
RFC 4717 Encapsulation for ATM over MPLS December 2006
Table of Contents
1. Introduction ....................................................3
2. Specification of Requirements ...................................4
3. Applicability Statement .........................................4
4. Terminology .....................................................4
5. General Encapsulation Method ....................................6
5.1. The Control Word ...........................................6
5.1.1. The Generic Control Word ............................7
5.1.2. The Preferred Control Word ..........................8
5.1.3. Setting the Sequence Number Field in the
Control Word ........................................9
5.2. MTU Requirements ...........................................9
5.3. MPLS Shim S Bit Value .....................................10
5.4. MPLS Shim TTL Values ......................................10
6. Encapsulation Mode Applicability ...............................10
6.1. ATM N-to-One Cell Mode ....................................11
6.2. ATM One-to-One Cell Encapsulation .........................13
6.3. AAL5 SDU Frame Encapsulation ..............................13
6.4. AAL5 PDU Frame Encapsulation ..............................14
7. ATM OAM Cell Support ...........................................15
7.1. VCC Case ..................................................15
7.2. VPC Case ..................................................16
7.3. SDU/PDU OAM Cell Emulation Mode ...........................16
7.4. Defect Handling ...........................................17
8. ATM N-to-One Cell Mode .........................................18
8.1. ATM N-to-One Service Encapsulation ........................19
9. ATM One-to-One Cell Mode .......................................21
9.1. ATM One-to-One Service Encapsulation ......................21
9.2. Sequence Number ...........................................22
9.3. ATM VCC Cell Transport Service ............................22
9.4. ATM VPC Services ..........................................24
9.4.1. ATM VPC Cell Transport Services ....................25
10. ATM AAL5 CPCS-SDU Mode ........................................26
10.1. Transparent AAL5 SDU Frame Encapsulation .................27
11. AAL5 PDU Frame Mode ...........................................28
11.1. Transparent AAL5 PDU Frame Encapsulation .................28
11.2. Fragmentation ............................................30
11.2.1. Procedures in the ATM-to-PSN Direction ............30
11.2.2. Procedures in the PSN-to-ATM Direction ............31
12. Mapping of ATM and PSN Classes of Service .....................31
13. ILMI Support ..................................................32
14. ATM-Specific Interface Parameter Sub-TLVs .....................32
15. Congestion Control ............................................32
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