Technical requirements for automatically switched optical network - Part 3: Data communication network
1 Scope
This part of GB/T 21645 specifies the architecture and functions of data communication network for automatically switched optical network (ASON), mainly including data communication network (DCN) application, general requirements for ASON DCN, requirements for management communication network (MCN), requirements for signalling communication network (SCN), DCN functional architecture and requirements as well as DCN network performance.
This part is applicable to synchronous digital hierarchy (SDH) transport network defined in ITU-T G.803 and optical transport network (OTN) defined in ITU-T G.872. It may also be used as reference for DCN applications in other communication networks.
2 Normative references
The following documents contain provisions which, through reference in this part of GB/T 21645, constitute provisions of this part. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition of the normative document applies.
ISO/IEC 9577 Information technology - Protocol identification in the network layer
ISO/IEC 10589 Information technology - Telecommunications and information exchange between systems - Intermediate system to intermediate system intra-domain routeing information exchange protocol for use in conjunction with the protocol for providing the connectionless-mode network service (ISO 8473)
ITU-T G.783 Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks
ITU-T G.784 Synchronous digital hierarchy (SDH) management
ITU-T G.798 Characteristics of optical transport network hierarchy equipment functional blocks
ITU-T G.803 Architecture of transport network based on the synchronous digital hierarchy (SDH)
ITU-TG.872 Architecture of optical transport networks
ITU-T G.874 Management aspects of the optical transport network element
ITU-T G.7712 Architecture and specification of data communication network
ITU-T G.8080 Architecture for the automatically switched optical networks (ASON)
ITU-T M.3010 Principles for a telecommunications management network
ITU-TM.3013 Considerations for a telecommunications management network
ITU-T M.3016 TMN security overview
ITU-T Q.811 Lower layer protocol profiles for the Q3 and X interfaces
ITU-T X.263 Information technology - Protocol identification in the network layer
ITU-T Y.1720 Protection switching for MPLS networks
IEEE 802.3 Ethernet LAN protocol
IETF RFC 791 Internet protocol
IETF RFC 826 Ethernet address resolution protocol or converting network protocol addresses to 48.bit Ethernet address for transmission on Ethernet hardware
IETF RFC 894 A standard for the transmission of IP datagrams over Ethernet networks
IETF RFC 1122 Requirements for Internet hosts - Communication layers
IETF RFC 1195 Use of OSI IS-IS for routing in TCP/IP and dual environments
IETF RFC 1332 The PPP Internet protocol control protocol (IPCP)
IETF RFC 1377 The PPP OSI network layer control protocol (OSINLCP)
IETF RFC 1661 The point-to-point protocol (PPP)
IETF RFC 1662 PPP in HDLC-like framing
IETF RFC 1812 Requirements for IP version 4 routers
IETF RFC 2460 Internet protocol, version 6 (IPv6) specification
IETF RFC 2472 IPv6 over PPP
IETF RFC 2784 Generic routing encapsulation (GRE)
IETF RFC 2961 RSVP Refresh overhead reduction extensions
IETF RFC 3031 Multiprotocol label switching architecture
IETF RFC 3032 MPLS label stack encoding
IETF RFC 3147 Generic routing encapsulation over CLNS networks
IETF RFC 3209 RSVP-TE: Extensions to RSVP for LSP tunnels
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this part, the following terms and definitions apply.
3.1.1
DCN
a network that supports Layer 1 (physical layer), Layer 2 (data-link layer), and Layer 3 (network layer) functions. A DCN can be designed to support transport of distributed management communications related to the TMN, distributed signalling communications related to the ASON, and other communications (e.g., orderwire/voice communications, software downloads, etc.)
3.1.2
ECC
ECC providing a logical operations channel between NEs. The physical channel supporting the ECC is technology specific. Examples of physical channels supporting the ECC are: a DCC channel within SDH, GCC channel within OTN OTUk/ODUk, or the COMMS OH channel within the OTNOOS
3.1.3
IP routing interworking function
a function allowing IP topology or routes to be passed from one IP routing protocol to a different incompatible IP routing protocol. For example, an IP routing interworking function may form a gateway between an integrated IS-IS routed DCN and an OSPF routed DCN
3.1.4
network layer interworking function
a function providing interoperability between nodes that support incompatible network layer protocols, such as static GRE tunnels, or an AE-DCF
3.1.5
AE-DCF
a function automatically encapsulating packets when necessary so that they may be routed by NEs that would otherwise be unable to forward them. An AE-DCF also features a matching de-encapsulation function to restore the packet back to its original form once it has traversed incompatible NEs
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
3.1 Terms and definitions
3.2 Abbreviations
4 DCN application
4.1 General application
4.2 ASON application
4.3 Division of applications
5 General requirements for ASON DCN
5.1 ASON DCN transport mode
5.2 DCN protocol encapsulation
5.3 DCN protocol interworking
6 Requirements for management communication network (MCN)
6.1 MCN architecture
6.2 Reliability of MCN
6.3 Security of MCN
6.4 MCN data communication functions (DCF)
7 Requirements for signalling communication network (SCN)
7.1 SCN architecture
7.2 General requirements for SCN
7.3 Reliability of SCN
7.4 Security of SCN
7.5 SCN data communication functions (DCF)
8 DCN functional architecture and requirements
8.1 DCN functional architecture
8.2 ECC access function
8.3 ECC data-link layer termination function
8.4 "Network layer PDU into ECC data-link frame" encapsulation function
8.5 Ethernet LAN physical termination function
8.6 "Network layer PDU into Ethernet frame" encapsulation function
8.7 Network layer PDU forwarding function
8.8 Network layer PDU interworking function
8.9 Network layer PDU encapsulation function
8.10 Network layer tunnelling function
8.11 Network layer routing function
8.12 IP routing interworking function
8.13 "Applications to network layer" mapping function
8.14 "MPLS PDU into ECC data-link layer" encapsulation function
8.15 "MPLS PDU into Ethernet frame" encapsulation function
8.16 MPLS LSP signalling function
8.17 MPLS LSP forwarding function
8.18 MPLS LSP path computation function
8.19 "Network layer packet into MPLS" encapsulation function
8.20 MPLS protection function
8.21 Message priority (optional)
9 DCN network performance
9.1 Basic requirements
9.2 Network performance parameters
自动交换光网络(ASON)技术要求
第3部分:数据通信网(DCN)
1 范围
GB/T 21645的本部分规定了自动交换光网络(ASON)数据通信网的体系结构和功能,主要包括数据通信网(DCN)应用、ASONDCN总体要求、管理通信网(MCN)要求、信令通信网(SCN)要求、DCN功能和结构要求以及DCN的网络性能。
本部分适用于ITU-T G.803定义的同步数字系列(SDH)传送网络和ITU-T G.872定义的光传送网络(OTN),其他通信网络中的DCN应用也可参照使用。
2 规范性引用文件
下列文件中的条款通过GB/T 21645的本部分的引用而成为本部分的条款。凡是注日期的引用文件,其随后所有的修改单(不包括勘误的内容)或修订版均不适用于本部分,然而,鼓励根据本部分达成协议的各方研究是否可使用这些文件的最新版本。凡是不注日期的引用文件,其最新版本适用于本部分。
ISO/IEC 9577 信息技术 网络层协议验证
ISO/IEC 10589 信息技术 系统间电信和信息交换 与提供无连接模式的网络服务(ISO 8473)协议共同使用的中间系统到中间系统域内路由信息交换协议-1992
ITU-T G.783 同步数字体系(SDH)设备功能块特性
ITU-T G.784 同步数字体系(SDH)管理
ITU-T G.798 光传送网(OTN)体系设备功能块特性
ITU-T G.803 基于同步数字系列(SDH)的传送网网络结构
ITU-TG.872 光传送网网络结构
ITU-T G.874 光传送网(OTN)管理
ITU-T G.7712 数据通信网体系结构与规范
ITU-T G.8080 自动交换光网络体系结构
ITU-T M.3010 电信管理网(TMN)总则
ITU-TM.3013 电信管理网(TMN)细则
ITU-T M.3016 电信管理网(TMN)安全
ITU-T Q.811 Q3和X接口低层协议框架
ITU-T X.263 信息技术 网络层协议验证
ITU-T Y.1720 MPLS网络保护倒换
IEEE 802.3 局域网协议标准
IETF RFC 791 互联网协议
IETF RFC 826 用于在以太网硬件传输的以太网地址转换协议或将网络协议地址转换为48比特以太网地址
IETF RFC 894 IP数据包通过以太网的传输标准
IETF RFC 1122 Internet主机要求 通信层
IETF RFC 1195 在TCP/IP和双协议栈环境中OSI IS-IS路由的应用
IETF RFC 1332 PPP互联网协议控制协议(IPCP)
IETF RFC 1377 PPP OSI网络层控制协议(OSINLCP)
IETF RFC 1661 点到点协议(PPP)
IETF RFC 1662 HDLC链路帧中的PPP
IETF RFC 1812 IPv4路由器要求
IETF RFC 2460 Internet协议第六版(IPv6)规范
IETF RFC 2472 IPv6 over PPP
IETF RFC 2784 通用路由封装(GRE)
IETF RFC 2961 RSVP Refresh开销降低的扩展
IETF RFC 3031 多协议标记交换结构
IETF RFC 3032 MPLS标记堆栈编码
IETF RFC 3147 CLNS网络通用路由封装
IETF RFC 3209 RSVP-TE:LSP 隧道的RSVP扩展
3 术语和定义、缩略语
3.1 术语和定义
下列术语和定义适用于本部分。
3.1.1
数据通信网 DCN
数据通信网是支持第1层(物理层)、第2层(数据链路层)和第3层(网络层)功能的网络。DCN用来支持TMN的分布式管理通信、ASON的分布式信令通信及其他通信应用(例如:公务联络线/语音通信、软件下载等)。
3.1.2
嵌入式控制通路 ECC
ECC提供网元之间的逻辑工作通路。支持ECC的物理通路与具体技术相关,例如:SDH中的DCC通路、OTN中OTUk/ODUk的GCC通路或OTNOOS中的COMMS OH通路。
3.1.3
IP路由互连功能 IP routing interworking function
IP路由互连功能使IP拓扑或路由信息可以在2种互不兼容的IP路由协议之间实现互通。例如:IP路由互连功能在支持集成的IS-IS路由协议的DCN与支持OSPF路由协议的DCN之间形成网关。
3.1.4
网络层互连功能 network layer interworking function
网络层互连功能实现在不同网络层协议节点之间的互通。例如静态的GRE隧道或AE-DCF。
3.1.5
自动封装的数据通信功能 AE-DCF
AE-DCF支持分组的自动封装功能,使NE在需要时能对不支持的协议分组进行转发。经过自动封装的分组通过非兼容的网元时,AE-DCF的解封装功能可以将其还原回去。
3.1.6
数据通信网可靠性 DCN reliability
当DCN通信发生故障时,通过DCN自身的保护恢复功能,使其具有网络自愈能力,以保证DCN通信的可用。
3.2 缩略语
下列缩略语适用于本部分。
AD Adaptation Device 适配器
AE-DCF Automatically Encapsulating Data Communication Function 自动封装的数据通信功能
ARP Address Resolution Protocol 地址解析协议
ASON Automatically Switched Optical Network 自动交换光网络
ATM Asynchronous Transfer Mode 异步转移模式
CallC Call Controller 呼叫控制器
CC Connection Controller 连接控制器
CCI Connection Controller Interface 连接控制接口
CLNP Connection-less Network Layer Protocol 面向无连接的网络层协议
CLNS Connection-less Network Layer Service 面向无连接的网络层服务
COMMS OH General Management Communications Overhead 通用管理通信开销
DCC Data Communications Channel 数据通信通路
DCF Data Communications Function 数据通信功能
DCN Data Communication Network 数据通信网
ECC Embedded Control Channel 嵌入式控制通路
EMF Equipment Management F unction 设备管理功能
E-NNI External Network-Network Interface 外部网络-网络接口
ES End System 终端系统
ES-IS End System to Intermediate System 终端系统到中间系统
GCC General Communications Channel 通用通信通路
GNE Gateway Network Element 网关网元
GRE Generic Routing Encapsulation 通用路由封装
HDLC High Level Data Link Control 高级数据链路控制
ICMP Internet Control Message Protocol 互联网控制消息协议
I-NNI Internal Network Network Interface 内部网络-网络接口
IP Internet Protocol 互联网协议
ISIS,IS-IS Intermediate System to Intermediate System 中间系统到中间系统
IWF Interworking Function 互连功能
LAN Local Area Network 局域网
LAPD Link- Access Procedure D Channel 链路接入处理D通路
LCN Local Communication Network 本地通信网
LER Label Edge Router 标记边缘路由器
LSP Label Switched Path 标记交换路径
LSR Label Switched Router 标记交换路由器
MAC Media Access Control 媒质接入控制
MCF Message Communications Function 消息通信功能
MCN Management Communication Network 管理通信网
MD Mediation Device 中介设备
MPLS Multiprotocol Label Switching 多协议标记交换
MTU Maximum Transmission Unit 最大传输单元
NE Network Element 网元
NEF Network Element Function 网元功能
NLPID Network-Layer Protocol Identifier 网络层协议标识
NSAP Network Service Access Point 网络服务接入点
ODUk Optical Channel Data Unit 光通路数据单元
OOS OTM Overhead Signal OTM开销信令
OS Operations System 操作系统
OSC Optical Supervisory Channel 光监控通路
OSF Operations System Function 操作系统功能
OSI Open System Interconnect 开放系统互连
OSILCP OSI Network Layer Control Protocol OSI网络层控制协议
OSPF Open Shortest Path First 开放式最短路径优先
OTM Optical Transport Module 光传送模块
OTN Optical Transport Network 光传送网络
OTUk Optical Channel Transport Unit 光通路传送单元
PDU Protocol Data Unit 协议数据单元
PPP Point-to-Point Protocol 点到点协议
SCN Signaling Communication Network 信令通信网
SNCr SubNetwork Controller 子网控制器
SDH Synchronous Digital Hierarchy 同步数字系列
SRG Shared Risk Group 共享风险组
TF Translation Function 转换功能
TMN Telecommunications Management Network 通信管理网
TNE Transport Network Element 传送网元
UNI User Network Interface 用户-网络接口
WAN Wide Area Network 广域网
WS Work Station 工作站
WSF Work Station Function 工作站功能
Xms X Management Subnetwork x管理子网
4 DCN应用
4.1 一般应用
DCN支持网络的第1层(物理层)、第2层(数据链路层)和第3层(网络层)的功能,并提供路由和交换功能。DCN的通信链路由各种接口实现。包括嵌入式控制通路(ECC)、局域网(LAN)接口和广域网(WAN)接口。
DCN支持分布式管理通信、分布式信令通信和其他应用,如图1所示。根据网络的设计,上述应用可采用各自独立的DCN,也可共用同一个DCN。在TMN应用中,TMN需要DCN在TMN元件(如:NEF元件和OSF元件)之间传递管理消息,此时DCN作为管理通信网(MCN)。在ASON应用中,除了需要传递管理消息之外,ASON还需要DCN在ASON元件之间(如:CC元件)传递控制消息,此时DCN还作为信令通信网(SCN)。
管理应用(例如:TMN)
信令应用(例如:ASON)
其他应用(例如:软件下载)
管理通信