GB/T 51375-2019 English PDF

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GB/T 51375-2019: Design standards for network engineering
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 51375-2019	1499	Add to Cart	10 days	Design standards for network engineering	Valid

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Basic data

Standard ID: GB/T 51375-2019 (GB/T51375-2019)
Description (Translated English): Design standards for network engineering
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: P76
Classification of International Standard: 33.020
Word Count Estimation: 75,777
Date of Issue: 2019
Date of Implementation: 2019-10-01
Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation

GB/T 51375-2019: Design standards for network engineering

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General 1.0.1 This standard is formulated in order to make the public Internet network engineering design achieve advanced technology, reasonable economy, safety and applicability, energy saving and material saving, and sustainable development. 1.0.2 This standard applies to the engineering design of new construction, reconstruction and expansion of public Internet networks. 1.0.3 The design of the public Internet network should follow the principle of openness. The designed network should be manageable, operable, and scalable, and the designed network should be safe and reliable. 1.0.4 The engineering design should select finalized products that meet the current relevant technical requirements of the country. The equipment and main materials that have not been certified by the product quality supervision and inspection agency shall not be used in the project. 1.0.5 In areas with a seismic fortification intensity of 7 degrees or above in my country, the main telecommunications equipment used in public Internet network projects shall pass the seismic performance test of telecommunications equipment. 1.0.6 In addition to complying with this standard, the engineering design of the public Internet network shall also comply with the current relevant national standards.

2 terms and codes

2.1 Terminology 2.1.1 Public Internet Internet It is an IP network that provides services for public users and can carry voice, data and multimedia services. 2.1.2 network node network node It is one of the basic units that constitute an IP network. Provides connections with other network nodes, provides a routing mechanism between nodes, and forwards IP data packets. A network node provides one or more network functions, and generally consists of one or several routers, switches and other network devices and server devices that are locally connected to each other in the same computer room. 2.1.3 Trunk circuit trunk It is one of the basic units that constitute an IP network. It connects different network nodes of the network and provides a physical or logical medium for communication between network nodes. 2.1.4 service access control system A system that connects users and services to the Internet network, implements functions such as authentication, authorization, and billing for user and service access, and implements functions such as service quality control and multicast control. 2.1.5 Operation and maintenance support system The systems that support the network and ensure normal operation mainly include network management systems and security systems. 2.1.6 security system security system It is a system that guarantees the normal operation of various network element equipment, ensures the safe transmission of information on the IP network, guarantees the security of network operation, maintenance and management, and guarantees business security. 2.1.7 network management system A system that ensures the normal operation of network elements and networks, and implements functions such as configuration management, resource management, fault management, and performance management. 2.1.8 Dual stack dual stack A technology that simultaneously supports IPν4 and IPv6 dual protocol stacks in network devices such as servers, routers, and switches. 2.1.9 data packet packet The packet that transmits data through the IP network is the end-to-end transmission unit of the IP network. 2.1.10 backbone network backbone network The backbone part of the Internet network is mainly used for the wide-area interconnection of various metropolitan area networks, and for inter-network interconnection with other IP networks. At the same time, it can directly access large-scale IDCs, large-scale business systems and important users. 2.1.11 metro area network The IP network within the metropolitan area is located between the backbone network and the metropolitan access network. It is the extension and coverage of the IP backbone network within the metropolitan area. It covers cities, suburbs, and counties and regions under their jurisdiction, providing A network for the interconnection, access and user access of various services in the metropolitan area. 2.1.12 Connectivity The minimum number of nodes that need to be removed to break all paths between a pair of nodes. 2.1.13 router router A network device that realizes network interconnection and works at the IP layer by forwarding data packets. A router can support multiple protocols, and this standard mainly refers to supporting TCP/IP protocol clusters and (or) MPLS-related protocols. 2.1.14 bandwidth mean peak utilization ratio The arithmetic mean value of circuit bandwidth utilization at each statistical granularity during the busiest hour of a day. 2.1.15 autonomous domain autonomous system Contains a group of subnets interconnected by a series of routers and other network devices, forming a connectable segment of the network topology. Network devices such as these subnets and routers are generally controlled by a single operation and maintenance management organization, have a single and clear routing policy, and are identified by an autonomous domain number. 2.1.16 network interconnection Use the IP protocol to connect multiple IP networks, and provide mutual forwarding of IP packets and routing information services at the network layer, so that users in one IP network can communicate with users in the connected IP network or use the connected IP Various business application resources in the network. 2.1.17 transfer mode transfer mode The provider's Internet unit provides necessary routing information to the client's Internet unit, and provides IP data packet forwarding services, so that the client's Internet unit can access the business and application resources in the provider's Internet unit's IP network, and through the provider's Internet unit's IP networks enable access to other IP networks. 2.1.18 peer mode peer mode Two interconnected units are connected equally, exchange routing information of both IP networks and realize mutual visits between users and business applications in both IP networks, and do not transfer traffic between third-party interconnected units. 2.1.19 tunnel tunnel The technology of encapsulating one protocol into another protocol, establishing a point-to-point transmission channel by encapsulating the transmission data header before the payload data message, so as to realize the transmission of payload data in the transmission message network. 2.1.20 translation protocol translation Establish a one-to-one mapping relationship between each field in one type of data packet and each field in another type of data packet, so as to realize the technology of data packet conversion at the interconnection of two networks. 2.1.21 network address translation network address translation The process of converting an IP address in an IP packet header to another IP address. 2.1.22 IP address IP address A fixed-length digital identifier assigned according to the IP protocol, used to identify the source and destination of data transmission, including IPv4 addresses and IPv6 addresses. 2.1.23 domain name system domain name system The domain name system is a distributed IP network service system that maps domain names to certain predefined types of resource records. The domain name service systems in the network cooperate with each other to realize the resolution of domain names to corresponding resource records. 2.1.24 IP packet transfer delay The transmission time required for an IP data packet to enter from one node in the network to leave another node in the network. 2.1.25 IP packet delay variation IP packet delay variation The IP packet transmission delay does not exceed the upper limit of probability 1-10-3 minus the minimum value of the IP packet transmission delay. 2.1.26 IP packet error ratio IP packet error ratio The ratio of the number of error IP packet transmission results to the sum of successful IP packet transmission plus error IP packet transmission results. 2.1.27 IP packet loss ratio IP packet loss ratio The ratio of the lost IP packet delivery result to the number of all IP packets. 2.1.28 quality of service The resource guarantee required by the IP network to carry services. Quality of service is characterized by indicators, including packet loss rate, delay, delay variation, link transmission code rate and its accuracy, etc. 2.1.29 access connection establishment success ratio In the wired access mode, it is the ratio of the number of times the access server is connected to the total number of times the user applies to establish a connection under the premise that the user account and password are correct; in the wireless access mode, the wireless terminal initiates a packet data connection establishment request and succeeds. The ratio of the number of connection establishment times to the total number of packet data connection establishment requests initiated by the wireless terminal. 2.1.30 user access authentication average response time In the wired access mode, when the user applies for establishing a network connection, the average time from the user submitting the account number and password to the access server completing the authentication and returning a response; in the wireless access mode, it is the time from the user submitting the data connection establishment Average time from the time of the request to the time the network returns a connection response. 2.1.31 wired access rate In the wired access mode, the access rate from the user terminal to the access server. 2.2 code name English abbreviation English name Chinese name ACL Access Control List Access Control List AFTR Address Family Transition Router Address Family Transition Router BFD Bidirectional Forwarding Detection Bidirectional Forwarding Detection BGP Border Gateway Protocol Border Gateway Protocol BRAS Broadband Remote Access Server Broadband Access Server BSS Business Support System Business Support System CIDR Classless Interdomain Routing Classless Interdomain Routing CGN Carrier-Grade NAT carrier-grade network address translation DiffServ Differentiated Services differentiated services DWDM Dense Wavelength Division Multiplexing Dense Wavelength Division Multiplexing ECMP Equal Cost Multi-Path Equal Cost Multi-Path E-LSP EXP-Inferred-PSC LSPs LSPs using the EXP field FRR Fast Reroute fast rerouting IDC Internet Data Center Internet Data Center IGP Interior Gateway Protocol Interior Gateway Protocol IP Internet Protocol Internet Protocol IPDV IP packet Delay Variation IP packet delay variation IPER IP packet Error Ratio IP packet error rate IPLR IP packet Loss Ratio IP packet loss rate IPTD IP packet Transfer Delay IP packet transmission delay IPv4 Internet Protocol version 4 Internet Protocol version 4 IPv6 Internet Protocol version 6 Internet Protocol version 6 IS-IS Intermediate System-to-Intermediate System Intermediate System to Intermediate System LDP Label Distribution Protocol label distribution protocol LSP Label Switched Path Label Switched Path MPLS Multiprotocol Label Switching Multiprotocol Label Switching NAP Network Switching Point Network Switching Point OSPF Open Shortest Path First Open Shortest Path First routing protocol OSS Operation Support System Operation Support System OTN Optical Transport Network Optical Transport Network QoS Quality of Service Service Quality RD Route Distinguisher route distinguisher RIP Route Information Protocol Routing Information Protocol RT Route Target routing target SDH Synchronous Digital Hierarchy Synchronous Digital Hierarchy SDN Software Designed Network Software Defined Network SNMP Simple Network Management Protocol Simple Network Management Protocol SR Service Router service router TE Traffic Engineering Traffic Engineering uRPF unicast Reverse Path Forwarding Unicast reverse path forwarding VLSM Variable-Length Subnet Mask variable length subnet mask VPN Virtual Private Network virtual private network XML Extensible Markup Language Extensible Markup Language

3 Network composition and functions

3.1 Composition 3.1.1 The public Internet network should be composed of network nodes, relay circuits, business access control system and operation and maintenance support system. 3.1.2 The operation and maintenance support system of public Internet network may include security system and network management system, etc. 3.2 Function 3.2.1 The public Internet network should have the ability to simultaneously forward IPv4 and IPv6 data packets and the ability to smoothly transition to the next-generation Internet, and a dual-stack method can be adopted. 3.2.2 The public Internet network should have the function of dynamic routing mechanism, establish and maintain the data packet forwarding routing table. 3.2.3 The public Internet network should support the MPLS protocol. 3.2.4 The public Internet network can support SDN-related protocols. 3.2.5 The public Internet network should be able to access various types of users to carry various services, should support billing for users and services, and should support intercommunication between IPv4 and IPv6 user services. 3.2.6 The public Internet network should have security functions. 3.2.7 The public Internet network shall have network management functions.

4 network structure

4.1 Network Hierarchy 4.1.1 The level of the public Internet network shall be determined according to factors such as scale, operation, maintenance and management, and shall comply with the following regulations. 1 The network level can be divided into two levels. backbone network and metropolitan area network; 2.According to business needs, a metropolitan area network can be established in cities and regions within the province, and a cross-regional regional metropolitan area network can also be organized according to factors such as business flow, flow direction and management; 3 Build a backbone network on top of the MAN, access and aggregate the traffic from each MAN and transfer and unblock it; 4 A small-scale network may consist of only one level of hierarchy, and may not distinguish between a backbone network and a metropolitan area network. 4.1.2 The public Internet backbone network can include two sub-levels. the inter-provincial backbone network and the intra-provincial backbone network. When the maintenance and management conditions permit, it is advisable to adopt a flat design method without distinguishing between inter-provincial and intra-provincial sub-levels. 4.1.3 The sub-layers of public Internet MAN should be determined according to factors such as scale, and can be divided into core layer, service access control layer and aggregation layer. The aggregation layer should access users and services through the MAN access network and MAN transmission network. 4.1.4 The public Internet should set up a domestic inter-network interconnection sub-layer in the backbone network to realize interconnection with other public Internets. 4.1.5 When the public Internet has international business needs, an international interconnection sublayer can be set up to realize interconnection with foreign public Internets; an international network part can be set up, which can be composed of an international traffic exchange layer and an international access layer. 4 The main function of the MAN access network should be to achieve user coverage through various access technologies and line resources, provide multiple ways of user access, and cooperate to complete user flow control functions when necessary. 4.2.8 The international network part can set up foreign nodes according to business needs, which are composed of international traffic exchange nodes and international access nodes. 4.3 Trunk Circuit Organization 4.3.1 Public Internet network nodes can use direct relay circuits or transfer methods to realize business flow dredging. stage circuit organization threshold. 4.3.2 The public Internet backbone network as a whole may use an incomplete mesh structure for relay circuit organization, and shall comply with the following regulations. 1 When core tandem nodes, aggregation and tandem nodes and general tandem nodes are set up in the backbone network, the organization of relay circuits between tandem nodes shall comply with the following regulations. 1) A relay circuit should be set up between a general tandem node and more than 2 (including 2) convergence and tandem nodes, and the convergence relationship should be within the same business operation and maintenance management domain; 2) A relay circuit should be set up between the converging node and more than 2 (including 2) core merging nodes, and the converging relationship should be determined by comprehensively considering the transmission routing direction and the threshold value of the circuit organization at this level; 3) A direct relay circuit should be set up between the convergence nodes in the same business operation and maintenance management domain; 4) When the business flow is large and exceeds the circuit organization threshold at the same level, efficient direct relay circuits can be set up between some aggregation and convergence nodes in different business operation and maintenance management domains. This circuit should only be used to dredge local traffic. 2 When core tandem nodes and general tandem nodes are set up in the backbone network, the organization of relay circuits between tandem nodes shall comply with the following regulations. 1) The general tandem node should set up a relay circuit with more than 2 (including 2) core tandem nodes, and the convergence relationship should be determined by comprehensively considering the transmission routing direction and the circuit organization threshold at the same level; 2) When the business flow is large and exceeds the circuit organization threshold at the same level, high-efficiency direct relay circuits can be set up between some general tandem nodes, and this circuit should only be used to dredge local traffic; 3) In the backbone network including inter-provincial and intra-provincial sub-levels, relay circuits should be set between the core tandem nodes of the provincial backbone network and more than 2 (including 2) general tandem nodes of the inter-provincial backbone network. 3.The trunk circuit organization between core tandem nodes shall comply with the following regulations. 1) Incomplete mesh structure or complete mesh structure can be used for circuit organization, and the topological structure should be determined by comprehensively considering the direction of transmission routing and the threshold value of circuit organization at this level; 2) The connectivity between core tandem nodes should not be less than 3. 4 Direct relay circuits should be set up between interconnection nodes, international entry and exit nodes, and core tandem nodes. ......

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