ADSL + MSTP build comprehensive Metro transmission network

Article title: ADSL + MSTP build a comprehensive Metro transmission network. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
In the face of increasing diverse transmission business needs, it is important for communication operators to establish a transmission network. An automatic switching optical network (ASON) and an integrated service transfer platform (MSTP) device form a Metro integrated transport network solution is a good choice.
　　
Automatic switching optical network features automatic switching optical network features dynamic allocation of network resources, which can automatically discover routes and establish connections, quickly provide services, and provide multiple levels of rapid business protection and recovery methods, this greatly improves network security and service quality. It provides network resource management, network planning, and optimization tools to optimize the network structure. it also has powerful scalability and management capabilities to improve the network efficiency and flexibility, and reduce the total cost of the network. It can optimize and support future TCP/IP services and other services. It also provides new services to adapt to the future development of network technology.
　　
　　 Features of integrated business transfer platform
The MSTP device is suitable for convergence and access layers of the Metro transmission network. it has a mature networking and protection mechanism. it can provide protection switching for the electrical layer of the transmission network for man, and the line switching time is less than 50 ms, as for the customer-layer man, it is impossible to notice that the line is faulty. It provides SDH, ATM, and Ethernet service interfaces, allowing you to flexibly increase access bandwidth as needed without changing the access port. MSTP is a transmission technology based on the underlying SDH frame structure. it can carry SDH, ATM, and IP service signals at the same time. in the next step, it can also support specialized interfaces such as Fiber Channel and ESCON, it has good compatibility with existing SDH networks. With the further maturity of MSTP devices, device costs will gradually decrease, effectively controlling investment costs. Therefore, using MSTP to carry SDH, Ethernet, and other services has a high comprehensive benefit.
　　
　　 Business type of Metro transmission network
The use of ASON and MSTP technology to build a metro transmission network can provide convergence for Ethernet and ADSL broadband access services, and carry upstream services for IP Man convergence, saving optical fiber resources. at the same time, it provides high-grade Ethernet data leased lines with configurable bandwidth and reliable quality, and flexibly provides customized leased line rental services for customers with different needs, further consolidating the market position of communication operators. Services activated in man include the following types:
　　
1) passthrough Ethernet Leased line service
　　
The passthrough Ethernet Leased Line service uses the passthrough Ethernet card to provide high-level data leased line services for major customers. A point-to-point leased line is a leased line service between two points in an MSTP ring. A high-level Ethernet passthrough service between two nodes (not in the same ring) across MSTP rings is called an end-to-end leased line. This solution is easy to implement and fast. the physical layer channel is dedicated to the Ethernet service to ensure QoS. the leased line bandwidth is 2 Mbps (or smaller, 100 KB) granular on-demand configuration. based on LCAS, you can flexibly adjust the leased line bandwidth (online) based on your needs. The SDH layer mechanism is used to protect Ethernet services, which is efficient and reliable; different Ethernet services are isolated from each other to ensure effective user isolation. they are transparent to VLAN, STP, and layer-3 protocols and do not affect user-layer services.
　　
2) multi-point-to-point passthrough combines data device networking services using multiple point-to-point passthrough Ethernet lines, combined with data devices (such as layer-2 switches) can provide local interconnection services for some major customers. Connect end users with LAN switches or Router at different POP points through high-quality Ethernet lease lines. MAC switching, VLAN switching, or business protection can be achieved through external data devices. The advantages of this solution are: maintaining the characteristics of the Ethernet lease line, making full use of the existing data facilities of the end user, and effectively isolating the data layer and the transmission layer.
　　
3) shared ethernet leased line service (VLAN leased line) shared ethernet leased line is a service that establishes multiple Ethernet Leased lines between two nodes of the MSTP network to share the same transmission bandwidth (same VCG, users of a leased line are differentiated and isolated by vlan id. This service requires MSTP to have an Ethernet switching function, which is implemented using an Ethernet switching board.
　　
4) point-to-point/end dynamic leased line service MSTP devices use elastic grouping ring (RPR), Multi-Protocol Label Switching (MPLS) and other mechanisms to provide dynamic bandwidth management capabilities, it can provide dynamic and adjustable bandwidth leased line services, provide excess bandwidth leasing, improve the bandwidth utilization of transmission networks, increase the flexibility of leased line services, and facilitate operators to provide customized leased line services for various customers, to provide operators' competitiveness and business income.
　　
5) The Ethernet aggregation service (MSTP) supports two-layer Ethernet switching for business convergence, which can further improve the utilization of transmission bandwidth and reduce the number of Ethernet ports on the center/station, it meets the requirements for the LAN broadband access service and the upstream service of the adsl dslam ip.
　　
6) ads ldslam atm upstream aggregation service MSTP supports atm vp/VC exchange, which can be used for business aggregation and further improve the utilization rate of transmission channels. If the adsl dslam upstream uses an ATM interface, MSTP is used to provide an ATM interface, and the service is aggregated and then transmitted to the ATM core network or IP network, not only can the bandwidth usage of the upstream channel be provided, it can also reduce the number of ATM ports used by core network devices.
　　
7) currently, MSTP devices support the RPR-based Ethernet shared ring function. Combining the low cost of Ethernet interfaces with the efficient protection of SDH networks to build an Ethernet ring network is a hot topic in the development of man. Through the Ethernet ring network, you can implement Transparent LAN services (TLS ). In the MSTP transmission system, virtual LAN interconnection services can be provided for major customers with multiple branches to achieve local interconnection of major customers. Multiple major customers can share a virtual channel and use VLAN IDs to isolate them.
　　
8) various VPN service MSTP devices provide a wide range of business interfaces. through flexible networking methods, MSTP devices can provide users with various VPN services, including leased line VPN and shared ring VPN.
　　
Generally, both VPN and VPN use VLAN IDs for user security isolation. the passthrough VPN has higher security features and is isolated from each other, however, the bandwidth utilization is not high.
　　
From the above description, we can see that the use of ASON and MSTP devices can achieve seamless network connections and provide users with flexible and diverse and secure integrated transmission services, this service meets users' transmission business needs and reduces communication operation costs, truly achieving a win-win situation for communication operators and users.