1、 International Telecommunication Union ITU-T X.87/Y.1324TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2003) SERIES X: DATA NETWORKS, OPEN SYSTEM COMMUNICATIONS AND SECURITY Public data networks Transmission, signalling and switching SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCO
2、L ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Transport Multiple services ring based on RPR ITU-T Recommendation X.87/Y.1324 ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS PUBLIC DATA NETWORKS Services and facilities X.1X.19 Interfaces X.20X.49 Transmi
3、ssion, signalling and switching X.50X.89 Network aspects X.90X.149 Maintenance X.150X.179 Administrative arrangements X.180X.199 OPEN SYSTEMS INTERCONNECTION Model and notation X.200X.209 Service definitions X.210X.219 Connection-mode protocol specifications X.220X.229 Connectionless-mode protocol s
4、pecifications X.230X.239 PICS proformas X.240X.259 Protocol Identification X.260X.269 Security Protocols X.270X.279 Layer Managed Objects X.280X.289 Conformance testing X.290X.299 INTERWORKING BETWEEN NETWORKS General X.300X.349 Satellite data transmission systems X.350X.369 IP-based networks X.370X
5、.399 MESSAGE HANDLING SYSTEMS X.400X.499DIRECTORY X.500X.599 OSI NETWORKING AND SYSTEM ASPECTS Networking X.600X.629 Efficiency X.630X.639 Quality of service X.640X.649 Naming, Addressing and Registration X.650X.679 Abstract Syntax Notation One (ASN.1) X.680X.699 OSI MANAGEMENT Systems Management fr
6、amework and architecture X.700X.709 Management Communication Service and Protocol X.710X.719 Structure of Management Information X.720X.729 Management functions and ODMA functions X.730X.799 SECURITY X.800X.849 OSI APPLICATIONS Commitment, Concurrency and Recovery X.850X.859 Transaction processing X
7、.860X.879 Remote operations X.880X.899 OPEN DISTRIBUTED PROCESSING X.900X.999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. X.87/Y.1324 (10/2003) i ITU-T Recommendation X.87/Y.1324 Multiple services ring based on RPR Summary This Recommendation specifies Multiple
8、 Services Ring (MSR) based on Resilient Packet Ring (RPR) and a way of multi-service provision over RPR. MSR is defined to work at the client of RPR MAC layer and uses Fairness Algorithm (FA) of RPR MAC to support services of Class A, Class B and Class C. MSR is used in configurations where a tribut
9、ary service is managed from provisioning. Architecturally, the link and broadcast topologies are also supported. The features of tributary (Service, just like Ethernet, Frame Relay and G.702, etc.) based 1+1, 1:1 and 1:N standby within 50 ms, tributary (Service) based BW management with symmetry and
10、 asymmetry, tributary based multicast and Frame Sequence Number for Performance Monitoring of tributary are highlighted in this Recommendation. Source ITU-T Recommendation X.87/Y.1324 was approved on 29 October 2003 by ITU-T Study Group 17 (2001-2004) under the ITU-T Recommendation A.8 procedure. ii
11、 ITU-T Rec. X.87/Y.1324 (10/2003) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, o
12、perating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn
13、, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE
14、In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g
15、. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not sug
16、gest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evi
17、dence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which
18、may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2005 All rights reserved. No part of this publication may be reproduced, by any means what
19、soever, without the prior written permission of ITU. ITU-T Rec. X.87/Y.1324 (10/2003) iii CONTENTS Page 1 Scope 1 2 References. 2 2.1 ITU-T Recommendations. 2 2.2 IEEE specifications 2 2.3 Informative Reference 2 3 Definitions 2 4 Abbreviations 6 4.1 Abbreviations specified in RPR 9 6 4.2 Abbreviati
20、ons specified in ITU-T Rec. I.321. 7 4.3 Abbreviations specified in ETSI 7 4.4 Abbreviations specified in this Recommendation 7 5 Network framework of multiple services ring based on RPR 9 5.1 Elements of ring over RPR MAC. 9 5.2 Frame types on a ring and multiple services in tributary . 9 5.3 Compo
21、nents of a data node in MAC client 10 5.4 Reference point in MAC client of a data node. 11 5.5 Transport functional architecture of MSR networks 12 5.6 Operation of network management frames in MAC client 18 5.7 Fault management in MAC client 18 5.8 Performance management in MAC client 19 6 The prot
22、ocol framework . 19 6.1 The protocol framework of aggregate pipe 19 6.2 MSR (client) interface to RPR MAC . 21 6.3 Tributary adaptation function unit 23 7 Generic frame format 23 7.1 Destination address for use of this Recommendation 24 7.2 Extended Ethertype field 25 7.3 Payload Type (PT) field . 2
23、5 7.4 Payload FCS Indicator (PFI) field 25 7.5 Reserved field. 25 7.6 TT/CS/NM field . 25 7.7 Tributary Number (TN) field 28 7.8 Reserved field. 28 7.9 Frame Sequence Number (FSN) field 28 7.10 HEC field 29 7.11 Payload of XP. 29 7.12 XP payload FCS . 33 iv ITU-T Rec. X.87/Y.1324 (10/2003) Page 8 Tr
24、ibutary Loopback (TRL) and Node Reachability Verification (NRV). 33 8.1 Tributary Loopback (TRL). 33 8.2 Tributary Loopback (TRL) shortcut. 34 8.3 Node Reachability Verification (NRV) 34 8.4 Node Reachability Verification (NRV) shortcut 35 9 TDM Circuit Emulation (TCE) over MSR. 35 9.1 Introduction
25、35 9.2 Protocol framework of TDM Circuit Emulation (TCE). 35 9.3 Services provided by MSR Data link . 36 9.4 Supported functions of XP for TCE case . 39 9.5 XP protocol involved to support TCE 43 9.6 Management function involved to support TCE 45 10 Tributary Based Standby (TBS) . 45 10.1 Ethernet T
26、ributary Based Standby (ETBS) 46 10.2 TCE Tributary Based Standby (TTBS) 49 11 Tributary Based Multicast (TBM) 51 12 Bandwidth policing, merging, line-speed filtering, stacking and mirroring of tributary 52 12.1 Tributary based policing Bandwidth limitation with symmetry and asymmetry 52 12.2 Tribut
27、ary merging with symmetry and asymmetry 53 12.3 Tributary based security line-speed filtering. 54 13 Topology application of link-type, broadcast network and pseudo-mesh 56 13.1 Support of a link-type with adding and dropping tributary services 56 13.2 Support of a broadcast connection to DVB applic
28、ation . 56 13.3 Support of a pseudo-mesh topology. 57 ITU-T Rec. X.87/Y.1324 (10/2003) v Introduction The expansion of business and metro use of data network services are driving the need to deploy data services infrastructure facilities with pre-plan method in the way of tributary or service. The d
29、ynamic bandwidth allocation and differentiated services over an aggregate pipe, tributary based bandwidth management, security function, standby, multicast, performance monitoring and their applications in the different topologies are the basic requirements of carrier class. Therefore, the developme
30、nt of multiple services ring based on RPR in this Recommendation needs to provide the following capabilities: 1) The protocol encapsulation and transport of Ethernet, Frame Relay, G.702 PDH circuit Synchronous and asynchronous circuit transport, Video signal, voiceband signal, Digital channel suppor
31、ted by 64 kbit/s-based ISDN, etc. over a two-fibre ring, a link-type and broadcast topology of fibres. 2) Service (or tributary) based standby of 1+1, 1:1, and 1:N models within 50 ms. 3) Service (or tributary) based multicast and station-based multicast and broadcast. 4) Bandwidth limitation of ser
32、vice (or tributary) based with symmetry and asymmetry. 5) Tributary merging with symmetry and asymmetry. 6) Line-speed filtering of tributary based. 7) Tributary based performance monitoring in 15 minutes and 24 hours. 8) Mirroring of tributary. 9) Frame based transparent PPPoE and PPPoA transport f
33、rom access to backbone along a MSR ring or other topologies, in order to simplify accounting mechanism (e.g., Radius), reduce maintenance work, and improve latency variation (compared to Layer 2 and Layer 3 switch) in access network application. This Recommendation provides a packet-based transport
34、model to multiple services and multiple topologies for continuation and extension of ITU-T Recs X.85/Y.1321 and X.86/Y.1323. Continued compatibility with all existing requirements and standards from ITU-T and other organizations is required. ITU-T Rec. X.87/Y.1324 (10/2003) 1 ITU-T Recommendation X.
35、87/Y.1324 Multiple services ring based on RPR 1 Scope This Recommendation specifies Multiple Services Ring (MSR) based on Resilient Packet Ring (RPR) and a way of multi-service provision over RPR. MSR is defined to work at the client of RPR MAC layer and uses Fairness Algorithm (FA) of RPR MAC to su
36、pport services of Class A, Class B and Class C. MSR is used in configurations where a tributary service is managed such that over provisioning does not occur. Architecturally, the link and broadcast topologies are also supported. The features of tributary (Service, just like Ethernet, Frame Relay an
37、d G.702, etc.) based 1+1, 1:1 and 1:N standby within 50 ms, tributary (Service) based Bandwidth management with symmetry and asymmetry, tributary based multicast and Frame Sequence Number for Performance Monitoring of tributary are highlighted in this Recommendation. MSR provides a packet-based tran
38、sport model to multiple services and multiple topologies. Figure 1/X.87/Y.1324 Scope of X.87/Y.1324 based on RPR as a MAC client This Recommendation is based on RPR as a MAC client and is used in configurations where topology and standby is provisioned. What this Recommendation emphasizes is tributa
39、ry, but not a payload of tributary; standby (1+1, 1:1 and 1:N) and multicast of tributary, but not multicast of MAC; MSR priority, but not MAC priority. The data frame, control frame and network management frame in this Recommendation are all required to map to the payload of RPR data frame. Some co
40、ntrol frames RPR defined are also used in X.87/Y.1324, just like topology discovery, protection and FA in RPR. All of these frames specified in this Recommendation have no relations to and are independent of the control frames (just like frames of topology discovery, 2 ITU-T Rec. X.87/Y.1324 (10/200
41、3) fairness, protection) of RPR MAC layer. No change is made for all Ethernet-based protocols (including IEEE 802.3 Ethernet), all PDH standards, Frame Relay standards, G.702/ISDN standards and ETSI DVB specifications. This Recommendation is located at a dual-directional symmetric counter-rotating r
42、ings based on RPR. NOTE It is intended that this Recommendation can be extended, in future amendments, to support additional new types of data service. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provision
43、s of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations a
44、nd other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. 2.1 ITU-T Recommendations 1 ITU-T Recommendation X.85/Y.13
45、21 (2001), IP over SDH using LAPS. 2 ITU-T Recommendation X.86/Y.1323 (2001), Ethernet over LAPS. 3 ITU-T Recommendation X.211 (1995) | ISO/IEC 10022:1996, Information technology Open Systems Interconnection Physical service definition. 4 ITU-T Recommendation X.212 (1995) | ISO/IEC 8886:1996, Inform
46、ation technology Open Systems Interconnection Data link service definition. 5 ITU-T Recommendation X.200 (1994) | ISO/IEC 7498-1:1994, Information technology Open Systems Interconnection Basic reference model: The basic model. 6 ITU-T Recommendation I.363.1 (1996), B-ISDN ATM Adaptation Layer specif
47、ication: Type 1 AAL. 7 ITU-T Recommendation G.805 (2000), Generic functional architecture of transport networks. 2.2 IEEE specifications 8 IEEE Standard 1802.3-2001, IEEE Conformance Test Methodology for IEEE Standards for Local and Metropolitan Area Networks CSMA/CD Access Method and Physical Layer
48、 Specifications. 2.3 Informative Reference 9 IEEE Standard P802.17/D3.0 (Draft), Resilient Packet Ring Access Method b) multicast/broadcast frames; and c) transmitted frames from the local station. If there are several frames to be sent in a node at the same time, the schedule unit will check priori
49、ty of frame and decide which frame will go first to the downstream along the ringlet. 6 ITU-T Rec. X.87/Y.1324 (10/2003) 3.37 XP Rx processor: A set of logical functions used to XP processing in Rx direction. It includes Rx entity from RPR MAC between reference point G1/G2 and T1/T2, discrimination of multicast/broadcast based on Tributary, TT/CS/NM value, TN value, FSN value and other associated XP protocol processing. 3.38 XP Tx processor: A set of logical functions used to XP processing in Tx direction. It
