1、 International Telecommunication Union ITU-T G.9973TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2011) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Access networks In premises networks Protocol for identifying home network topology Recommendation ITU-T G.9973 ITU-T G-
2、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 INTERNATIONAL CARRIER TELEPHONE SYSTEMS
3、 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 OPTICAL SYSTEMS CHARACTERISTICS G.
4、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 DATA OVER TRANSPORT GENERIC ASPE
5、CTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 In premises networks G.9950G.9999For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.9973 (10/2011) i Recommendation ITU-T G.9973 Protocol for identifying home network topology S
6、ummary Based on Recommendation ITU-T G.9971, Recommendation ITU-T G.9973 specifies the configuration management protocol, which is described in TTC JJ-300.00. This protocol is used to manage devices in the IP home network for the purpose of showing users the Layer 2 home network topology. History Ed
7、ition Recommendation Approval Study Group 1.0 ITU-T G.9973 2011-10-29 15 Keywords Access gateway, Ethernet, home network, IP, LLDP, management, protocol, topology, UDA, UPnP. ii Rec. ITU-T G.9973 (10/2011) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized age
8、ncy 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 them with a view
9、 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-T Recommendati
10、ons 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 for concisene
11、ss 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 Recommendation
12、 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 any party. INTE
13、LLECTUAL 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 evidence, validity or applicability of claimed Intellectual Property Rights, w
14、hether 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, implementers are cau
15、tioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at “. 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.9973 (10
16、/2011) 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 network topology 3 7 Functional requirements o
17、f the protocol for identifying the home network topology 3 8 The protocol for identifying home network topology 4 8.1 Management information . 4 8.2 Interaction between the local manager and the local L3 agent 5 8.3 Interaction between the local manager and the local L2 agent 5 9 Connectivity check
18、between the local manager and the local agents . 6 9.1 Connectivity check between the local manager and the local L3 agent . 6 9.2 Connectivity check between the local manager and the local L2 agent . 6 Annex A Detailed fields and values of TLVs . 7 Bibliography. 8 Rec. ITU-T G.9973 (10/2011) 1 Reco
19、mmendation ITU-T G.9973 Protocol for identifying home network topology 1 Scope Various kinds of Internet protocol (IP) terminal devices, such as PCs, digital TVs, gaming devices, and portable music devices, have recently been, and continue to be, connected to the IP home network. Furthermore, their
20、number is increasing. The kinds of transmission media (PLC, wireless, UTP, etc.) used to connect each IP terminal are also becoming more varied. Under such circumstances, most users are unable to troubleshoot the IP home network by themselves, without the availability of appropriate network services
21、. 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.9971 describes three kinds of management requirements for the IP home network: configuration management, fault management, and perfo
22、rmance 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 to manage devices in the IP home network for the purpose of showing the Layer 2 (L2) home network topology to users within the home
23、network only (behind the access gateway (AGW). On the other hand, b-BBF TR-069 called CPE WAN Management Protocol is the candidate for the remote home network management protocol from outside of the AGW. Although it may be necessary in the future to study the interaction between this management prot
24、ocol and the CPE WAN Management Protocol, it is out of the scope in this Recommendation. This Recommendation does not identify devices on multiple links, but 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
25、 AGW and the IP 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, ITU-T G.9973 may in the future be extended to cover multiple links composed of IP and non-IP devices. Home network security is imp
26、ortant. A device using ITU-T G.9973 to collect information about the home network will be required to take certain steps to ensure that the information is not accessible through the wide area network (WAN) interface of the AGW. 2 References The following ITU-T Recommendations and other references co
27、ntain 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 therefore encouraged to investigate
28、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-alone document, the status of
29、a Recommendation. ITU-T G.9970 Recommendation ITU-T G.9970 (2009), Generic home network transport architecture. ITU-T G.9971 Recommendation ITU-T G.9971 (2010), Requirements of transport functions in IP home networks. IEEE 802.3 IEEE 802.3-2008, Part 3: Carrier sense multiple access with Collision D
30、etection (CSMA/CD) Access Method and Physical Layer Specifications. 2 Rec. ITU-T G.9973 (10/2011) IEEE 802.1AB IEEE 802.1AB-2009, Local and Metropolitan Area Networks - Station and Media Access Control Connectivity Discovery. IEEE 802.1D IEEE 802.1D-2004, IEEE Standard for Local and metropolitan are
31、a networks, Media Access Control (MAC) Bridges. IETF RFC 792 Internet Engineering Task Force (IETF) RFC 792 (1981), INTERNET CONTROL MESSAGE PROTOCOL. ISO/IEC 29341-1 ISO/IEC 29341-1:2008, Information technology UPnP Device Architecture Part 1: UPnP Device Architecture Version 1.0, Edition 1.0. TTC
32、JJ-300.00 TTC JJ-300.00 (2011), 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 acronyms This Recommendation uses the following abbreviations and acronyms: AGW Access Gateway DDD Dev
33、ice Description Document ICMP Internet Control Message Protocol IP Internet Protocol LA Local Agent LAN Local Area Network LLDP Link Layer Discovery Protocol LLDPDU LLDP Data Unit LM Local Manager L2 Layer 2 L3 Layer 3 MAC Media Access Control MIB Management Information Base NW Network OUI Organizat
34、ionally Unique Identifier TLV Type, Length, Value TTL Time To Live UDA UPnP Device Architecture UTP Unshielded Twisted Pair UPnP Universal Plug and Play Rec. ITU-T G.9973 (10/2011) 3 WAN Wide Area Network 5 Conventions In this Recommendation: The keyword “must“ implies that it is strictly required t
35、o claim conformance. The keyword “should“ implies that it is recommended for performance improvement, 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 netw
36、ork topology Figure 6-1 shows the home network area in which the protocol specified by this Recommendation is applied. Both the access network and the IP/non-IP home network behind the IP terminal are out of the scope of this Recommendation. Moreover, the IP home network which is directly connected
37、from the access network without the AGW is also out of the scope. The target home network is composed of the IP terminal, Ethernet bridge, and AGW, where one or more IP terminals can be connected to the IP home network and zero or more Ethernet bridges can reside within the IP home network. The AGW
38、has two kinds of functions: the home network side and the access network side, while it contains L2 and/or L3 functions. This Recommendation 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 fun
39、ction, this Recommendation only covers the functions necessary for identifying L2 home network topology. It is assumed that the broadcast protocol in the data link layer is utilized for this protocol. The applied area of the protocolIP home networkEthernetbridgeIPterminalIP/non-IPhome networkAGWAcce
40、ssnetworkFigure 6-1 The applied area of 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 and the local agent,
41、 the definitions of which are described in 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
42、 8-1 will also be helpful to understand these 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 t
43、o the local manager in the manner described in clause 8.2. 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 t
44、he local manager in the manner described in clause 8.3. 4 Rec. ITU-T G.9973 (10/2011) 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 local manager in the manner described in clause 8.2. R4 (based on R11-C5 in ITU-T G.9971):
45、 The local L2 agent must be able to acquire and transmit its device information to the local manager 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 local manager in the manner describe
46、d in clause 9.1. R6 (based on R11-L2 in ITU-T G.9971): The local L2 agent should be able to send packets periodically to the local manager for checking connectivity in the manner described in clause 9.2. 8 The protocol for identifying home network topology This clause describes the interaction betwe
47、en the local manager and the local L3 agent, as well as the local manager and the local L2 agent. Management information to identify the IP home network topology falls into two areas: device information and MAC forwarding table information. One example of device information is the device category, s
48、uch as the Ethernet bridge or PC. Device information resides in the local L3 agent or the local L2 agent, while the MAC forwarding table information resides in the local L2 agent of the Ethernet bridge or the AGW. Management information can be retrieved by the local manager, which can reside in any
49、device in the IP home network, according to the last paragraph of clause 11.1 of ITU-T G.9971. Figure 8-1 shows a typical case where the local manager resides in the AGW. The AGW has both the local L2 and L3 agents, while the Ethernet bridge and the IP terminal have the local L2 agent and the local L3 agent, respectively. The local L3 agent of the IP terminal sends device information by using the UDA, while the local L2 agent of the Ethernet bridge sends both device information and MAC forwarding table i
