1、 InteITTELECOSTANDAOF ITU SERIDIGITPackaspecSERIINFRAND InternArchSwitRecornatiU-TMMUNICATRDIZATIONES G: TAL SYSet over Tts ES Y: GASTRUNEXT-Get protoitectuching mmendonal ION SECTORRANSMTEMS ranspoLOBALCTUREENERAcol aspre of thtranspation ITTelecG.ISSIONAND Nrt aspeINFOR, INTERTION ects Te Multort
2、proU-T Gommu8110SYSTETWORcts MPMATIONET PNETWOranspoi-Protofile lay.8110.1/nicat.1/YEMS ANKS LS oveN ROTOCRKS rt col Laer netY.1370ion U.13(D MEDr TransOL ASPbel work .1 nion70.112/2011IA, port ECTS ) ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNA
3、TIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SY
4、STEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTION
5、S AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 Ethernet over Transport aspects
6、 G.8000G.8099 MPLS over Transport aspects G.8100G.8199Quality and availability targets G.8200G.8299 Service Management G.8600G.8699 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.8110.1/Y.1370.1 (12/2011) i Recommendation ITU-T G.811
7、0.1/Y.1370.1 Architecture of the Multi-Protocol Label Switching transport profile layer network Summary Recommendation ITU-T G.8110.1/Y.1370.1 provides functional components, based on Recommendation ITU-T G.805, that allow the Multi-Protocol Label Switching Transport Profile (MPLS-TP) to be modelled
8、 in a way that is consistent with the description of other transport technologies defined by the ITU-T, (e.g., the synchronous digital hierarchy (SDH) and the optical transport network (OTN), to simplify integration with other transport technologies. This Recommendation provides a representation of
9、the MPLS-TP technology using the methodologies that have been used for other transport technologies (e.g., SDH, OTN and Ethernet). NOTE This ITU-T Recommendation is intended to be aligned with the IETF MPLS RFCs normatively referenced by this Recommendation. In this Recommendation the architecture o
10、f MPLS-TP forwarding, operation, administration and maintenance (OAM), and network survivability is modelled from a network-level viewpoint. The description of the control plane and management plane aspects of MPLS-TP is outside the scope of this Recommendation. The functional components described i
11、n this Recommendation also support the architecture for point-to-multipoint (p2mp) MPLS-TP label switched paths (LSPs), in compliance with IETF RFC 5331 and IETF RFC 5332. History Edition Recommendation Approval Study Group 1.0 ITU-T G.8110.1/Y.1370.1 2006-11-10 15 1.1 ITU-T G.8110.1/Y.1370.1 (2006)
12、 Amd. 1 2007-07-29 15 2.0 ITU-T G.8110.1/Y.1370.1 2011-12-16 15 ii Rec. ITU-T G.8110.1/Y.1370.1 (12/2011) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU T
13、elecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardizati
14、on Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, 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 technol
15、ogy which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance
16、 with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligat
17、ory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation
18、of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of th
19、e date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to co
20、nsult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2012 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.8110.1/Y.1370.1 (12/2011) iii Table of Contents Page 1 Scope 1 2 References.
21、2 3 Definitions 3 4 Abbreviations and acronyms 5 5 Conventions 7 6 Functional architecture of MPLS Transport Profile (MPLS-TP) networks . 7 6.1 MPLS-TP network layered structure 8 6.2 MPLS-TP layer network . 11 6.3 MPLS-TP layer network partitioning . 15 6.4 MPLS-TP network topology 15 6.5 MPLS-TP l
22、abel behaviour 19 7 Server/client associations 19 7.1 MT/client adaptation 19 7.2 MT/MT adaptation . 20 7.3 Server/MT adaptation . 21 8 MPLS-TP OAM architecture 23 8.1 General . 23 8.2 MPLS-TP connection and trail supervision . 25 8.3 MPLS-TP maintenance entity group monitoring . 27 8.4 MPLS-TP MIP
23、28 8.5 Bandwidth considerations with MPLS-TP OAM . 29 9 MPLS-TP survivability techniques. 29 10 MPLS-TP Diff-Serv architecture 29 10.1 Short-pipe model 30 10.2 Uniform model . 30 11 MPLS-TP TTL behaviour 31 12 Security aspects 31 Annex A Default configuration options for MPLS-TP in a transport netwo
24、rk application 32 Appendix I An example of MPLS-TP layer structure 34 Bibliography. 40 Rec. ITU-T G.8110.1/Y.1370.1 (12/2011) 1 Recommendation ITU-T G.8110.1/Y.1370.1 Architecture of the Multi-Protocol Label Switching transport profile layer network 1 Scope This Recommendation provides the functiona
25、l components, based on ITU-T G.805, that are necessary to describe the deployment of Multi-Protocol Label Switching Transport Profile (MPLS-TP) in a transport network. This model allows MPLS-TP to be modelled in a way that is consistent with the description of other transport technologies defined by
26、 ITU-T, (e.g., the synchronous digital hierarchy (SDH), the optical transport network (OTN), etc.). This Recommendation provides a representation of the MPLS-TP technology using the methodologies that have been used for other transport technologies, (e.g., SDH, OTN and Ethernet).1MPLS-TP is a connec
27、tion-oriented packet-switched transport layer network technology that uses pseudowires (PWs) and MPLS-TP label switched paths (LSPs). The MPLS-TP is a profile of the MPLS that supports deployment in transport networks and allows operations in a manner consistent with other transport technologies. It
28、s operation is independent of the mechanisms used for configuration and management. In some applications, the data plane only supports forwarding based on the MPLS label; it does not support IP forwarding. The architecture of the MPLS-TP forwarding, operation, administration and maintenance (OAM), a
29、nd network survivability, is modelled from a network-level viewpoint. The description of the control plane and management plane aspects of the MPLS-TP is outside the scope of this Recommendation. The functional components described in this Recommendation also support the architecture for point-to-mu
30、ltipoint (p2mp) MPLS-TP LSPs in compliance with IETF RFC 5331 and IETF RFC 5332. As the MPLS-TP is a profile of the MPLS, this Recommendation uses the applicable functional components provided in the MPLS layer network architecture of ITU-T G.8110 and extends them with additional capabilities (e.g.,
31、 OAM and protection) that are not modelled in ITU-T G.8110. This version of this Recommendation only provides those functional components (based on ITU-T G.805) and architectural models required to model an Ethernet service carried by a single-segment pseudowire (SS-PW) over co-routed bidirectional
32、LSPs, which may be hierarchical, and do not use penultimate hop popping (PHP). Other clients for LSPs (e.g., Internet Protocol (IP), and PWs and modes of operation (e.g., multi-segment pseudowire (MS-PW) or associated bidirectional LSPs), as described in IETF RFC 5921, are supported as defined in IE
33、TF RFC 5921 and IETF RFC 6215 but are not modelled in this version of the Recommendation. They will be added in future versions of this Recommendation. _ 1This ITU-T Recommendation is intended to be aligned with the IETF MPLS RFCs normatively referenced by this Recommendation. 2 Rec. ITU-T G.8110.1/
34、Y.1370.1 (12/2011) 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are
35、 subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a docu
36、ment within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T G.805 Recommendation ITU-T G.805 (2000), Generic functional architecture of transport networks. ITU-T G.806 Recommendation ITU-T G.806 (2009), Characteristics of transport equipment Des
37、cription methodology and generic functionality. ITU-T G.808.1 Recommendation ITU-T G.808.1 (2010), Generic protection switching Linear trail and subnetwork protection. ITU-T G.7712 Recommendation ITU-T G.7712/Y.1703 (2010), Architecture and specification of data communication network. ITU-T G.8010 R
38、ecommendation ITU-T G.8010/Y.1306 (2004), Architecture of Ethernet layer networks. ITU-T G.8013 Recommendation ITU-T G.8013/Y.1731 (2011), OAM functions and mechanisms for Ethernet based networks, plus Corrigendum 1 (2011). ITU-T G.8080 Recommendation ITU-T G.8080/Y.1304 (2006), Architecture for the
39、 automatically switched optical network. ITU-T G.8101 Recommendation ITU-T G.8101/Y.1355 (2010), Terms and definitions for MPLS transport profile. ITU-T G.8110 Recommendation ITU-T G.8110/Y.1370 (2005), MPLS layer network architecture. ITU-T M.1400 Recommendation ITU-T M.1400 (2006), Designations fo
40、r interconnections among operators networks. ITU-T Y.1415 Recommendation ITU-T Y.1415 (2005), Ethernet-MPLS network interworking User plane interworking. IETF RFC 3031 IETF RFC 3031 (2001), Multiprotocol Label Switching Architecture. IETF RFC 3032 IETF RFC 3032 (2001), MPLS Label Stack Encoding. IET
41、F RFC 3270 IETF RFC 3270 (2002), Multi-Protocol Label Switching (MPLS) Support of Differentiated Services. IETF RFC 3443 IETF RFC 3443 (2003), Time To Live (TTL) Processing in Multi-Protocol Label Switching (MPLS) Networks. IETF RFC 4385 IETF RFC 4385 (2006), Pseudowire Emulation Edge-to-Edge (PWE3)
42、 Control Word for Use over an MPLS PSN. IETF RFC 4448 IETF RFC 4448 (2006), Encapsulation Methods for Transport of Ethernet over MPLS Networks. IETF RFC 4720 IETF RFC 4720 (2006), Pseudowire Emulation Edge-to-Edge (PWE3) Frame Check Sequence Retention. Rec. ITU-T G.8110.1/Y.1370.1 (12/2011) 3 IETF R
43、FC 4875 IETF RFC 4875 (2007), Extensions to Resource Reservation Protocol Traffic Engineering (RSVP-TE) for Point-to-Multipoint TE Label Switched Paths (LSPs). IETF RFC 5331 IETF RFC 5331 (2008), MPLS Upstream Label Assignment and Context-Specific Label Space. IETF RFC 5332 IETF RFC 5332 (2008), MPL
44、S Multicast Encapsulations. IETF RFC 5462 IETF RFC 5462 (2009), Multiprotocol Label Switching (MPLS) Label Stack Entry: “EXP“ Field Renamed to “Traffic Class“ Field. IETF RFC 5586 IETF RFC 5586 (2009), MPLS Generic Associated Channel. IETF RFC 5654 IETF RFC 5654 (2009), MPLS-TP Requirements. IETF RF
45、C 5718 IETF RFC 5718 (2010), An Inband Data Communication Network For the MPLS Transport Profile. IETF RFC 5860 IETF RFC 5860 (2010), Requirements for Operations, Administration, and Maintenance (OAM) in MPLS Transport Networks. IETF RFC 5921 IETF RFC 5921(2010), A Framework for MPLS in Transport Ne
46、tworks. IETF RFC 5960 IETF RFC 5960 (2010), MPLS Transport Profile Data Plane Architecture, plus Errata 2533 (2010) and Errata 2534 (2010). IETF RFC 6215 IETF RFC 6215 (2011), MPLS Transport Profile User-to-Network and Network-to-Network Interfaces. IETF RFC 6370 IETF RFC 6370 (2011), MPLS Transport
47、 Profile (MPLS-TP) Identifiers. IETF RFC 6371 IETF RFC 6371 (2011), Operations, Administration, and Maintenance Framework for MPLS-Based Transport Networks. 3 Definitions This Recommendation uses the following terms defined in ITU-T G.8101: 3.1 access point 3.2 adapted information 3.3 administrative
48、 domain 3.4 administrative state 3.5 associated channel header 3.6 bottom of stack 3.7 characteristic information 3.8 client/server relationship 3.9 connection 3.10 connection point 3.11 connection supervision 3.12 explicitly TC-encoded-PSC LSP 3.13 G-ACh packet 3.14 G-ACh packet payload 3.15 generi
49、c associated channel 4 Rec. ITU-T G.8110.1/Y.1370.1 (12/2011) 3.16 label 3.17 label inferred PHB scheduling class LSP 3.18 label stack 3.19 label switched path 3.20 label value 3.21 layer network 3.22 link 3.23 link connection 3.24 maintenance entity 3.25 maintenance entity group 3.26 maintenance entity group intermediate point compound function 3.27 MPLS label stack 3.28 network 3.29 network connection 3.30 network survivability 3.31
