1、 International Telecommunication Union ITU-T G.8012/Y.1308TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(05/2006) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Ethernet over Transport aspects General aspects SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET
2、PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Transport Ethernet UNI and Ethernet NNI Amendment 1 ITU-T Recommendation G.8012/Y.1308 (2004) Amendment 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNEC
3、TIONS 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 SYSTEMS ON RADIO-RELAY OR
4、 SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALIT
5、Y 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 ETHERNET OVER TRANSPORT ASPECTS G.8000G.8999 General aspects G.8000G.8099 MPLS over Transport aspects G.8100G.8199 Quality and a
6、vailability targets G.8200G.8299 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.8012/Y.1308 (2004)/Amd.1 (05/2006) i ITU-T Recommendation G.8012/Y.1308 Ethernet UNI and Ethernet NNI Amendment 1 Summary This amendment contains extensi
7、ons to the first version (2004) of ITU-T Rec. G.8012/Y.1308, related to the addition of: Ethernet over MPLS. Ethernet over RPR. This amendment incorporates the frame format of provider bridges and deletes specifications of length encapsulation of client data since that encapsulation is not used for
8、Ethernet over Transport. The two Ethernet over Transport NNIs and the provider bridge frame were already considered for the first version of this Recommendation, but the standards defining these frames (ITU-T Rec. Y.1415, IEEE 802.1ad and IEEE 802.17) were not approved at that moment. Source Amendme
9、nt 1 to ITU-T Recommendation G.8012/Y.1308 (2004) was approved on 7 May 2006 by ITU-T Study Group 15 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. G.8012/Y.1308 (2004)/Amd.1 (05/2006) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized
10、 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, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a world
11、wide 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, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WT
12、SA 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 In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication adminis
13、tration and a recognized operating agency. Compliance 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 provisio
14、ns 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 suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to t
15、he 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 evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside
16、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 may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest
17、 information and are therefore strongly urged to consult the TSB patent database. ITU 2006 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.8012/Y.1308 (2004)/Amd.1 (05/2006) iii CONTENTS Page 1) In
18、troduction 1 2) Additions 1 2.1) Clause 1 1 2.2) Clause 4 1 2.3) Clause 6.2.1 1 2.4) Clause 6.2.1 3 2.5) Clause 6.2.3 6 2.6) Clause 6.2.3 6 2.7) New clause 7.4 7 2.8) New Appendix III. 7 2.9) New Appendix IV. 10 2.10) Bibliography. 11 3) Modifications 11 3.1) Clause 4 11 3.2) Clause 6.1 . 11 3.3) Cl
19、ause 6.1.1 12 3.4) Clause 6.2.1 12 3.5) Clause 7 13 3.6) Clause 7.1 . 13 3.7) Clause 7.3 . 13 3.8) Appendix I 14 3.9) Bibliography. 14 ITU-T Rec. G.8012/Y.1308 (2004)/Amd.1 (05/2006) 1 ITU-T Recommendation G.8012/Y.1308 Ethernet UNI and Ethernet NNI Amendment 1 1) Introduction This amendment contain
20、s extensions to the first version (2004) of ITU-T Rec. G.8012/Y.1308, related to the addition of: Ethernet over MPLS. Ethernet over RPR. This amendment incorporates the frame format of provider bridges and deletes specifications of length encapsulation of client data. 2) Additions 2.1) Clause 1 Add
21、the following references: ITU-T Recommendation G.8112/Y.1371 (2006), Interfaces for the Transport MPLS (T-MPLS) hierarchy. ITU-T Recommendation Y.1415 (2005), Ethernet-MPLS network interworking User plane interworking. IEEE 802.1ad-2005, IEEE standard for local and metropolitan area networks Virtual
22、 Bridged Local Area Networks Amendment 4: Provider Bridges. IEEE 802.17-2004, IEEE standard for Information technology Telecommunications and information exchange between systems Local and metropolitan area networks Specific requirements Part 17: Resilient packet ring (RPR) access method and physica
23、l layer specifications. 2.2) Clause 4 Add the following abbreviation: TPID Tag Protocol Identifier 2.3) Clause 6.2.1 Add a new subclause 6.2.1.6: 6.2.1.6 MPLS link frame 6.2.1.6.1 MPLS link frame without common interworking indicators and without MAC FCS An ETH_CI traffic unit is mapped without any
24、extension into the payload of the MPLS_CI traffic unit. See Figure 6-18a. 2 ITU-T Rec. G.8012/Y.1308 (2004)/Amd.1 (05/2006) Figure 6-18a/G.8012/Y.1308 MPLS link header without common interworking indicators and without MAC FCS preservation 6.2.1.6.2 MPLS link frame without common interworking indica
25、tors and with MAC FCS An ETH_CI traffic unit is extended with a MAC FCS and then mapped into the payload of the MPLS_CI traffic unit. See Figure 6-18b. Figure 6-18b/G.8012/Y.1308 MPLS link header without common interworking indicators and with MAC FCS preservation 6.2.1.6.3 MPLS link frame with comm
26、on interworking indicators and without MAC FCS An ETH_CI traffic unit is extended with 32-bit common interworking indicators as specified in ITU-T Rec. Y.1415 and then mapped into the payload of the MPLS_CI traffic unit. The 32-bit common interworking indicators comprise an 8-bit control field set t
27、o all-0s, an 8-bit Fragmentation and Length field set to all-0s and a 16-bit Sequence Number field. See Figure 6-18c. ITU-T Rec. G.8012/Y.1308 (2004)/Amd.1 (05/2006) 3 Figure 6-18c/G.8012/Y.1308 MPLS link header with common interworking indicators and without MAC FCS preservation 6.2.1.6.4 MPLS link
28、 frame with common interworking indicators and with MAC FCS An ETH_CI traffic unit is extended with a MAC FCS and with 32-bit common interworking indicators as specified in ITU-T Rec. Y.1415 and then mapped into the payload of the MPLS_CI traffic unit. The 32-bit common interworking indicators compr
29、ise an 8-bit control field set to all-0s, an 8-bit Fragmentation and Length field set to all-0s and a 16-bit Sequence Number field. See Figure 6-18d. Figure 6-18d/G.8012/Y.1308 MPLS link header with common interworking indicators and MAC FCS preservation 2.4) Clause 6.2.1 Add a new subclause 6.2.1.7
30、: 6.2.1.7 RPR link frame Clause 9.2 of IEEE 802.17 defines a basic and extended RPR data frame format. As a result, the ETH client frame mapping to IEEE 802.17 RPR frames has three variations as described in the following subclauses. 4 ITU-T Rec. G.8012/Y.1308 (2004)/Amd.1 (05/2006) 6.2.1.7.1 Basic
31、RPR link frame The ETH client DA Service Provider S-TCI (which includes the S-VID), to form the PB_ETH_CI. The PB_ETH_CI can be further encapsulated with Provider Backbone B-MAC addresses, a B-Tag comprising: 802.1ad Type field; Backbone Provider B-TCI (which includes the B-VID used for backbone tun
32、nel identification), ITU-T Rec. G.8012/Y.1308 (2004)/Amd.1 (05/2006) 11 and an I-Tag comprising: 802.1ah Type field; I-TCI (which includes the I-SID used for service instance identification); the Customer C-MAC addresses, to form the PBB_ETH_CI. The PBB_ETH_CI is then further encapsulated to form a
33、link frame. In general, for all the subclause 6.2.3.x describing the Ethernet NNI interfaces, the ETH_CI could alternatively be the PB_ETH_CI or PBB_ETH_CI. Figure IV.2 illustrates the additional PB and PBB mapping steps. Figure IV.2/G.8012/Y.1308 Ethernet mapping and multiplexing with PB and PBB 2.
34、10) Bibliography Add a new item. IEEE Standards Association Project Authorization Request, Project P802.17b (C/LM) Information Technology Telecommunications and information exchange between systems Local and metropolitan area networks Specific requirements Resilient Packet Ring Access Method & Physi
35、cal Layer Specifications Amendment 1 Spatially Aware Sublayer. http:/standards.ieee.org/cgi-bin/status?802 3) Modifications 3.1) Clause 4 Remove ETHP and ETHS from the list of abbreviations. 3.2) Clause 6.1 Replace text and figure by the following: The basic structure is shown in Figure 6-9. A clien
36、t signal of the ETH layer network is mapped into the M_SDU by adding a 2-byte type field/length field. NOTE Length encapsulation is not used in Ethernet over Transport and, therefore, not addressed in this Recommendation. However, Ethernet over Transport is transparent for MAC-SDUs that contain leng
37、th encapsulated client data. 12 ITU-T Rec. G.8012/Y.1308 (2004)/Amd.1 (05/2006) Figure 6-9/G.8012/Y.1308 Structure of the ETH interfaces 3.3) Clause 6.1.1 Delete all three bullet items. 3.4) Clause 6.2.1 Replace text and figure by the following: The ETH_CI consists of a MAC Destination Address (DA),
38、 a MAC Source Address (SA), a MAC Service Data Unit (M_SDU) (see ITU-T Rec. G.8010/Y.1306 and IEEE 802.3ae, clause 2). The M_SDU may optionally include a Tag (see IEEE 802.1Q). A client signal of the ETH layer network is mapped into the M_SDU via Type/Length encapsulation. Table 6-4/G.8012/Y.1308 Ov
39、erview of encapsulated units Encapsulation type Reference EtherType encapsulated client IEEE 802.3, clause 3 Tag IEEE 802.1Q, subclause 9.3.2 ETH encapsulated MAC SDU IEEE 802.3, clause 3 IEEE 802.3ae, clause 2 MAC encapsulated ETH IEEE 802.3, clause 3 ITU-T Rec. G.8012/Y.1308 (2004)/Amd.1 (05/2006)
40、 13 Figure 6-10/G.8012/Y.1308 Ethernet principle information containment 3.5) Clause 7 Replace Figure 7-1 by the following one: Figure 7-1/G.8012/Y.1308 Ethernet mapping and multiplexing 3.6) Clause 7.1 Replace the first paragraph with the following one: The client signal is mapped into the ETH sign
41、al (frame) directly via TYPE encapsulation, refer to 6.2.1. 3.7) Clause 7.3 Replace the text by the following: Figure 7-4 illustrates a two-level multiplexing of up to 4094 4094 ETH signals into an ETH topological link. The ETH_CI traffic unit is for that purpose extended with a first level C-Tag in
42、cluding a C-VID as specified in IEEE 802.1Q and then multiplexed into an Ethernet Unit Group level 1. The EUG1 is extended with a second level S-Tag including also an S-VID (Figure 7-5) and then multiplexed into an Ethernet Unit Group level 2. The structure of the S-Tag is defined in IEEE 802.1ad. 1
43、4 ITU-T Rec. G.8012/Y.1308 (2004)/Amd.1 (05/2006) Figure 7-4/G.8012/Y.1308 Ethernet two-level multiplexing Figure 7-5/G.8012/Y.1308 Ethernet two-level multiplexing method 3.8) Appendix I Remove the complete Appendix I for this Recommendation. 3.9) Bibliography Delete first reference (P802.1ad) from
44、Bibliography. ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Services, applications and middleware Y.200Y.299 Network aspects Y.300Y.399 Interfaces and protocols Y.400Y.499
45、Numbering, addressing and naming Y.500Y.599 Operation, administration and maintenance Y.600Y.699 Security Y.700Y.799 Performances Y.800Y.899 INTERNET PROTOCOL ASPECTS General Y.1000Y.1099 Services and applications Y.1100Y.1199 Architecture, access, network capabilities and resource management Y.1200
46、Y.1299 Transport Y.1300Y.1399 Interworking Y.1400Y.1499 Quality of service and network performance Y.1500Y.1599 Signalling Y.1600Y.1699 Operation, administration and maintenance Y.1700Y.1799 Charging Y.1800Y.1899 NEXT GENERATION NETWORKS Frameworks and functional architecture models Y.2000Y.2099 Qua
47、lity of Service and performance Y.2100Y.2199 Service aspects: Service capabilities and service architecture Y.2200Y.2249 Service aspects: Interoperability of services and networks in NGN Y.2250Y.2299 Numbering, naming and addressing Y.2300Y.2399 Network management Y.2400Y.2499 Network control archit
48、ectures and protocols Y.2500Y.2599 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 For further details, please refer to the list of ITU-T Recommendations. Printed in Switzerland Geneva, 2006 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff pr
49、inciples Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L C
