Basic Introduction of GSMP Protocol

Speaking of the concept of transmission, we naturally think of both synchronous and asynchronous. The GSMP protocol is an asynchronous transmission protocol. Now let's take a look at its specific analysis. Let's take a look at this agreement.

GSMP

General Switch Management Protocol (GSMP)

GSMP is part of the switching structure and is used for IP switching controllers. GSMP is an asynchronous protocol that sets the IP exchange controller as the master controller, and the ATM switch as a subordinate controlled device, so that the IP exchange controller is used to control the work of the ATM switch.

GSMPRFC1987) is a common ATM switch control protocol. GSMP is used to establish and release connections, add and delete nodes in multicast communication, manage vswitch ports, and obtain configuration information and statistical data.

In recent years, the latest development of the green code has evolved to a new type of technology, namely, the general business reuse process (Generalized Service Multiplexing Procedure-GSMP ). GSMP is developed based on existing standards such as the green code, virtual connection virtual concatenation, and Link Capacity Adjustment Scheme-LCAS. GSMP is designed to implement multiple data services and use statistical multiplexing to work with existing underlying transmission links. This not only improves the efficiency of transmission bandwidth usage, but also guarantees the QoS and SLA of connection services.

It can be said that green is a simple and easy-to-use Adaptation Mechanism for transmitting Ethernet and Fiber Channel in the fiber network, GSMP proposes a new network level and has the ability to support multiple business models. The label or tag concept is also introduced in the GSMP protocol to further expand on the basis of the green code. The label in the GSMP protocol is also called the Extended Linear Frame). It has enough header space to accommodate unique addresses, priority levels, service levels, and other necessary information, the header stack is also supported to improve scalability. Similar to ATM and MPLS networks, tokens sent by users are tagged. Once a tag is inserted, network devices can process data tokens according to the tag information, such as reuse, oversubscribe of the business) and separate management and control of each data stream. A gsmp connection can carry a large amount of Ethernet user data, and store network data and data of Packet Ring services. In addition, each service can have independent traffic and QoS parameters, over-order level, and fault protection and recovery mechanisms.

At present, GSMP is mainly applied in the following aspects: Aggregation and transmission of multiple data streams for a single user; data transmission services for users distributed in one or more buildings; it provides aggregation transmission to multiple Ethernet-based DSLAM uplinks and transmits data streams from multiple SONET/SDH links. This is very similar to the business model of the ATM network. However, compared with ATM, GSMP has higher bandwidth utilization efficiency and lower costs. This is because in the GSMP network, complicated data packets are not required to be sent to the ATM cell. This is the process of splitting and restructuring (segmentation and reassembly-SAR. In addition, the service capability of the GSMP network is not related to the high-level protocol, but also to the network topology. The unique header protection mechanism also makes it possible to support a single management system platform that supports a variety of services, including Ethernet, ATM, trunk relay, storage network, and video publishing. More importantly, it is a technology based on SONET/SDH, so the current backbone transmission network does not need any major changes, but only needs to upgrade the edge network.

Currently, the debate on GSMP protocol development focuses on whether MPLS mechanism is used for data compaction. Some ideas support the use of the linear extension headers of the Green Line, while others believe that the MPLS-based label technology is better. As a compromise, a direct ing relationship can be established between the MPLS label and the MPLS header. This makes the Green Line an internal part of the MPLS control plane or in a network that does not support the MPLS protocol, it can be done through the OSS system. This advantage is that, after the implementation of GMPLS technology by the operator, the green child layer can be controlled and managed in a similar way as the circuit.

Ethernet and storage network services were once a major obstacle to Sonet/SDH business expansion, while the proposal of the green and GSMP technologies solved these problems well. Many traditional operators have launched Ethernet and storage services on their SONET networks. However, one problem that still needs to be solved in the current development is how to further promote the simple point-to-point business within the urban area to a comprehensive multi-point connection business.

At present, there is a point of view that, since there is already a mature MPLS Technology System in the IP network to provide multi-service support functions, why do we need to continue to develop the relationship between the two GSMP protocol systems on SONET/SDH? Simply put, the answer is that the existing SONET/SDH is still the main profit source of operators in the near future. Although the application scope of the data network is growing, the investment returns of the operator from the data network business are still a small part. Therefore, carriers still need to further develop and improve their transmission networks to maximize profits, at the same time, transmission network equipment manufacturers also hope to prove that there are other options beyond the "all-IP network" Through GSMP and other technologies.