1、 International Telecommunication Union ITU-T G.8011/Y.1307TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(08/2005) 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 over Transport Ethernet services framework Amendment 1 ITU-T Recommendation G.8011/Y.1307 (2004) Amendment 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNAT
3、IONAL 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 SYS
4、TEMS 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 CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SY
5、STEM G.900G.999 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 ETHERNET OVER TRANSPORT ASPECTS G.8000G.8999 General aspects G.8000G.8099 MPLS over Transport aspects G.81
6、00G.8199 Quality and availability 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.8011/Y.1307 (2004)/Amd.1 (08/2005) i ITU-T Recommendation G.8011/Y.1307 Ethernet over Transport Ethernet services framework Amendme
7、nt 1 Summary This amendment provides more information on traffic management/metering resulting from the development of ITU-T Rec. G.8011.2/Y.1307.2. Source Amendment 1 to ITU-T Recommendation G.8011/Y.1307 (2004) was approved on 22 August 2005 by ITU-T Study Group 15 (2005-2008) under the ITU-T Reco
8、mmendation A.8 procedure. ii ITU-T Rec. G.8011/Y.1307 (2004)/Amd.1 (08/2005) 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
9、-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 Standardization Assembly (WTSA), which meets every four years, establishes the topics for stu
10、dy 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 technology which fall within ITU-Ts purview, the necessary standards are prepared on a
11、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 with this Recommendation is voluntary. However, the Recommendation may contain
12、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 obligatory language such as “must“ and the negative equivalents are used to express requi
13、rements. 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 of this Recommendation may involve the use of a claimed Intellectual Property Righ
14、t. 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 the date of approval of this Recommendation, ITU had received notice of intellectual
15、 property, protected by patents, which 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 publicati
16、on may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.8011/Y.1307 (2004)/Amd.1 (08/2005) iii CONTENTS Page 1) Clause 7.6 . 1 2) Clause 8.1.2 2 3) Table 9-1. 2 4) New clause 9.1.4. 2 5) Clause 9.1.5 2 ITU-T Rec. G.8011/Y.1307 (2004)/Amd.1 (08/2005) 1
17、 ITU-T Recommendation G.8011/Y.1307 Ethernet over Transport Ethernet services framework Amendment 1 1) Clause 7.6 Modify the text in clause 7.6 as follows: 7.6 Bandwidth profile Bandwidth profile is applicable per service instant. It is applicable both at the UNI and the NNI interfaces. It defines a
18、n upper bound on the volume of the expected service frames belonging to a particular service instance. Bandwidth profile defines four traffic parameters. Those parameters are that characterize the ETH_CI flow arrival pattern at the UNI or the NNI. Four parameters are defined, Committed Information R
19、ate (CIR), Committed Burst Size (CBS), Excess Information Rate (EIR), and Excess Burst Size (EBS). CIR and CBS are related together in such a way that CBS must be defined when CIR is set at a value that is greater than 0. EIR and EBS are related in the same way as CIR and CBS. CIR is defined as the
20、maximum information rate the network is committed to transfer under normal conditions. Performance metrics in terms of frame delay and loss are applicable only to those frames that are within the CIR. CBS defines a limit on the maximum number of information units available for a burst of ingress ser
21、vice frames sent at the interface speed to remain CIR-conformant. EIR is the maximum information rate by which a user can exceed its CIR. EBS defines a limit on the maximum number of information units available for a burst of ingress service frames sent at the interface speed to remain EIR-conforman
22、t. Performance metrics in terms of frame delay and loss are not applicable to the frames that are within the service EIR. The bandwidth profile traffic parameters are enforced using a metering algorithm as part of the traffic conditioning. Two additional parameters relevant to the operation of the m
23、etering algorithms are introduced. Those parameters are, the coupling flag (CF) and the colour mode (CM). CF and CM are referred to as bandwidth profile parameters. They allow for a choice between the different modes of operations for the metering algorithm. CF and CM take the values 0 or 1 only. In
24、gress service frames are disposed of based on their conformance to CIR and EIR. Higher discard precedence is assigned to frames that are conformant to EIR (i.e., yellow coloured frames) than that assigned to frames that are conformant to CIR (i.e., green coloured frames). Yellow frames are expected
25、to be dropped first when congestion is encountered at the service layer. Frames that are non-conformant to either CIR or EIR (i.e., red frames) are dropped at the interface. The bandwidth profile parameters constitute an input to a traffic conditioning function defined in ITU-T Rec. G.8010/Y.1306. T
26、he terms CIR, CBS, EIR and EBS and the applicability to this Recommendation is for further study. The relationship of bandwidth profile to CoS and the applicability to multipoint-to-multipoint services is for further study. The definition of CIR, CBS, EIR and EBS will be provided in a Y-series Recom
27、mendation. A description of CIR and CBS is currently provided in Appendix II/G.8011.1/Y.1307.1. 2 ITU-T Rec. G.8011/Y.1307 (2004)/Amd.1 (08/2005) 2) Clause 8.1.2 Add the following paragraph to the end of clause 8.1.2: On ingress, the onus is on customer equipment to shape the service instance that w
28、ill be multiplexed to ensure sufficient fairness to avoid congestion of the access link. The network can ensure service instance bandwidth on the ETH link with traffic conditioning. 3) Table 9-1 Modify Table 9-1 in clause 9 as follows: Table 9-1/G.8011/Y.1307 NNI service attributes Layer NNI service
29、 attribute Service attribute parameters and values MAC service IEEE 802.3-2002 Frame format NNI ID Arbitrary text string to identify each NNI instance NNI EC ID Arbitrary text string to identify each EC instance Multiplexed Link Yes, No VLAN ID mapping For further studySpecify Bundling For further s
30、tudy Bandwidth profile For further study ETH Layer 2 Control Protocol Processing Block, process, pass per protocol on ingress Generate or none per protocol on egress Server Server layer Specify 4) New clause 9.1.4 Insert a new clause after clause 9.1.3 as follows and renumber consecutive clauses acc
31、ordingly: 9.1.4 Multiplexed link This attribute indicates if the NNI link is multiplexed (i.e., contains multiple service instances) or not. The options are: yes or no. In the case of multiplexed link, one ETH link is used to transport ETH_CI of multiple customers service instances. Since logical se
32、paration is used on the ETH link flow, identifiers for flow isolation (e.g., S-VLAN tag) need to be specified. 5) Clause 9.1.5 Modify the text of the previous clause 9.1.4, now clause 9.1.5, as follows: 9.1.5 VLAN ID Mapping At the NNI there can be a mapping of each service provider VLAN ID to at mo
33、st one EC. In the case of no multiplexed link (see 9.1.4), there is no S-VLAN ID and, therefore, this mapping is not applicable. In the case of multiplexed link, the value of the S-VLAN ID mapped to EC ID must be specified. Note that more than only one S-VLAN ID can point to the same EC. For further
34、 study. 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 Number
35、ing, 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.1200Y.1299
36、 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 Quality o
37、f 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 architecture
38、s 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, 2005 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principl
39、es 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 netwo
40、rk Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside plant Series M Telecommunication management, including TMN and n
41、etwork maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling Series R Telegraph transm
42、ission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
