1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T G.9973 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2017) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Access networks In premises networks Protocol for identifying home network topology Rec
2、ommendation ITU-T G.9973 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERN
3、ATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS 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 O
4、PTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS 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
5、 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 Metallic access networks G.9700G.9799 Optical line systems for local and access networks G.9800G.9899 In premises networks G.9900G.9999 For further details, please refer to the l
6、ist of ITU-T Recommendations. Rec. ITU-T G.9973 (08/2017) i Recommendation ITU-T G.9973 Protocol for identifying home network topology Summary Based on Recommendation ITU-T G.9971, Recommendation ITU-T G.9973 specifies the configuration management protocol. This protocol is used to manage devices in
7、 the Internet protocol (IP) home network for the purpose of showing users the layer 2 home network topology. Recommendation ITU-T G.9973 also enables fault management utilizing device information that the local agent (LA) of the device manages. They are described in TTC JJ-300.00. History Edition Re
8、commendation Approval Study Group Unique ID* 1.0 ITU-T G.9973 2011-10-29 15 11.1002/1000/11405 2.0 ITU-T G.9973 2017-08-13 15 11.1002/1000/13340 Keywords Access gateway, Ethernet, fault, home network, IP, LLDP, management, non-Ethernet data link, protocol, topology, UDA, UpnP. _ * To access the Reco
9、mmendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.9973 (08/2017) FOREWORD The International Telecommunication Union (ITU) is the United Nations s
10、pecialized agency in the field of telecommunications, information and communication technologies (ICTs). 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 th
11、em 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, produce Recommendations on these topics. The approval of ITU-
12、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 In this Recommendation, the expression “Administration“ is used
13、 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., interoperability or applicability) and compliance with the
14、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 suggest that compliance with the Recommendation is required of a
15、ny party. INTELLECTUAL PROPERTY RIGHTSITU 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 evidence, validity or applicability of claimed Intellectual Prope
16、rty 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 property, protected by patents, which may be required to implement this Recommendation. However, impleme
17、nters are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written
18、permission of ITU. Rec. ITU-T G.9973 (08/2017) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 The applied area of the protocol for identifying home net
19、work topology 3 7 Functional requirements of the protocol for identifying the home network topology 3 8 The protocol for identifying home network topology 4 8.1 Management information . 5 8.2 Interaction between the local manager and the local L3 agent 5 8.3 Interaction between the local manager and
20、 the local L2 agent 6 9 Connectivity check between the local manager and the local agents . 6 9.1 Connectivity check between the local manager and the local L3 agent . 7 9.2 Connectivity check between the local manager and the local L2 agent . 7 Annex A Detailed fields and values of TLVs . 8 Bibliog
21、raphy. 9 Rec. ITU-T G.9973 (08/2017) 1 Recommendation ITU-T G.9973 Protocol for identifying home network topology 1 Scope Various kinds of Internet protocol (IP) terminal devices, such as personal computers (PCs), digital televisions (TVs), gaming devices, and portable music devices, have recently b
22、een, and continue to be, connected to the IP home network. Furthermore, their number is increasing. The kinds of transmission media (power line communication (PLC), wireless, unshielded twisted pair (UTP), etc.) used to connect each IP terminal are also becoming more varied. Under such circumstances
23、, most users are unable to troubleshoot the IP home network by themselves, without the availability of appropriate network services. It is desired to introduce a simple and easy IP home network management that can localize the fault in each device and network and help recover from trouble. ITU-T G.9
24、971 describes three kinds of management requirements for the IP home network: configuration management; fault management; and performance management. Based on ITU-T G.9971, this Recommendation specifies the configuration management protocol that is described in TTC JJ-300.00. This protocol is used t
25、o manage devices in the IP home network for the purpose of showing the layer 2 (L2) home network topology to users within the home network only (behind the access gateway (AGW). On the other hand, b-BBF TR-069, covering the customer premises equipment (CPE) wide area network (WAN) management protoco
26、l, is the candidate for the remote home network management protocol from outside the AGW. Although it may be necessary in the future to study the interaction between this management protocol and the CPE WAN management protocol, it lies outside the scope of this Recommendation. This Recommendation al
27、so enables fault management utilizing device information that the local agent (LA) of the device manages. This Recommendation identifies devices on a single link as shown in Figure 8-1. Note that “a single link“ means the one data link layer, which constitutes one IP domain between the AGW and the I
28、P terminal. As the deployment of new link-layer technologies such as b-IEEE 802.15.4 will enable and require the use of multiple links in the home network, this Recommendation covers multiple links composed of IP devices and may be extended to cover multiple links composed of IP and non-IP devices i
29、n the future. Home network security is important. A device using this Recommendation to collect information about the home network will be required to take certain steps to ensure that the information is not accessible through the WAN interface of the AGW. 2 References The following ITU-T Recommenda
30、tions 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 subject to revision; users of this Recommendation are therefo
31、re 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 document within this Recommendation does not give it, as a stand-a
32、lone document, the status of a Recommendation. ITU-T G.9971 Recommendation ITU-T G.9971 (2010), Requirements of transport functions in IP home networks. IEEE 802.1AB IEEE 802.1AB-2016, IEEE standard for local and metropolitan area networks Station and media access control connectivity discovery. 2 R
33、ec. ITU-T G.9973 (08/2017) IEEE 802.1D IEEE 802.1D-2004, IEEE Standard for local and metropolitan area networks: media access control (MAC) bridges. IETF RFC 1701 Internet Engineering Task Force Request For Comments 1701 (1994), Generic routing encapsulation (GRE). ISO/IEC 29341-1 ISO/IEC 29341-1:20
34、11, Information technology UPnP Device Architecture Part 1: UPnP Device Architecture Version 1.0. TTC JJ-300.00 TTC JJ-300.00 (2017), Home-network topology identifying protocol (HTIP). 3 Definitions 3.1 Terms defined elsewhere None. 3.2 Terms defined in this Recommendation None. 4 Abbreviations and
35、acronyms This Recommendation uses the following abbreviations and acronyms: AGW Access Gateway CPE Customer Premises Equipment DDD Device Description Document DVD Digital Versatile Disk GRE Generic Routing Encapsulation ICMP Internet Control Message Protocol ID Identifier IP Internet Protocol L2 Lay
36、er 2 L3 Layer 3 LA Local Agent LLDP Link Layer Discovery Protocol LLDPDU LLDP Data Unit LM Local Manager MAC Media Access Control OUI Organizationally Unique Identifier PC Personal Computer PLC Power Line Communication TLV Type, Length, Value TTL Time To Live TV Television UDA UPnP Device Architectu
37、re Rec. ITU-T G.9973 (08/2017) 3 UTP Unshielded Twisted Pair UPnP Universal Plug and Play WAN Wide Area Network 5 Conventions In this Recommendation: The keyword “must“ implies that it is strictly required to claim conformance. The keyword “should“ implies that it is recommended for performance impr
38、ovement, etc. although it is not absolutely required to claim conformance. The keyword “may“ implies that it is not required to claim conformance. 6 The applied area of the protocol for identifying home network topology Figure 6-1 shows the home network area in which the protocol specified by this R
39、ecommendation is applied. Both the access network and the IP/non-IP home network behind the IP terminal lie outside the scope of this Recommendation. Moreover, the IP home network that is directly connected from the access network without the AGW also lies outside the scope. The target home network
40、is composed of the IP terminal, the network equipment and the AGW, where one or more IP terminals can be connected to the IP home network and zero or more pieces of network equipment can reside within the IP home network. The network equipment is a hardware device that has two or more ports and a fu
41、nction to transfer frames and packets received at one port to the other by using a media access control (MAC) forwarding table (e.g., Ethernet bridge). The AGW has two kinds of function: the home network side and the access network side, while it contains L2 or layer 3 (L3) functions. This Recommend
42、ation only covers configuration management on the home network side functions of the AGW. Moreover, even if the AGW contains an L3 function, such as an IP routing function, this Recommendation only covers the functions necessary for identifying L2 home network topology. Figure 6-1 The applied area o
43、f the protocol 7 Functional requirements of the protocol for identifying the home network topology The protocol is mainly used for identifying the home network topology. It is also used for checking the connectivity between the local manager (LM) and the LA, the specifications of which are given in
44、clause 11.1 of ITU-T G.9971. This Recommendation specifies the protocol that meets some of the requirements listed in clause 11.3 of ITU-T G.9971. The functional requirements, as well as their relationship with those in ITU-T G.9971, are given below. Figure 8-1 is also helpful for understanding thes
45、e requirements. R1 (based on R11-C1 and R11-C2 in ITU-T G.9971): The local L3 agent must be able to acquire the IP and MAC addresses of the device where the local L3 agent resides. The local L3 agent must also be able to transmit the IP and MAC addresses to the LM in the manner described in clause 8
46、.2. 4 Rec. ITU-T G.9973 (08/2017) R2 (based on R11-C3 in ITU-T G.9971): The local L2 agent must be able to acquire the MAC forwarding table retained by the device where the local L2 agent resides. The local L2 agent must also be able to transmit the MAC forwarding table to the LM in the manner descr
47、ibed in clause 8.3. R3 (based on R11-C4 in ITU-T G.9971): The local L3 agent must be able to acquire and transmit its device information to the LM in the manner described in clause 8.2. R4 (based on R11-C5 in ITU-T G.9971): The local L2 agent must be able to acquire and transmit its device informati
48、on to the LM in the manner described in clause 8.3. R5 (based on R11-L2 in ITU-T G.9971): The local L3 agent should be able to respond to a connectivity check command from the LM in the manner described in clause 9.1. R6 (based on R11-L2 in ITU-T G.9971): The local L2 agent should be able to send pa
49、ckets periodically to the LM for checking connectivity in the manner described in clause 9.2. R7: The local L2 agent must be able to acquire the MAC address of the device where the local L2 agent resides. The local L2 agent must also be able to transmit the MAC address to the LM in the manner described in clause 8.3. R8: The local L2 agent must be able to acquire the IP address of the device where the local L2 agent resides. (Required when the local L2 agent suppor
