In recent years, fixed network data and 3G services continue to develop, which inevitably requires the IP of the transmission network, that is, the transmission network is required to be converted from the circuit cross core to the packet switching core, and the packet switching core is used to realize efficient transmission of packet services. As the basic supporting network of the telecommunication operation network, the transmission network is always developed to meet the business requirements carried and to prioritize the development of the business. In the golden development period of the past 10 years, SDH equipment with circuit cross-linking as the core covers almost the backbone core layer, convergence layer and access layer of the entire telecommunications. Later, driven by the IP business, MSTP equipment has been greatly developed. However, the MSTP device is still an SDH device with circuit crossover as the core. It only adds some data service interfaces, which can realize transparent transmission of data services and some simple service aggregation. The T-MPLS (TransportMulTI-protocolLabelSwitching) technology is a technology that extends downward from the core network. Based on the IP core network, MPLS technology simplifies complex control protocols and data planes, enhances OAM capabilities, protection switching and recovery functions, and provides reliable QoS and bandwidth statistics multiplexing. T-MPLS is built on top of MPLS technology, and its related standards provide a carrier-grade complete solution for deploying packet-switched transport networks. More importantly, in order to maintain the integrity of the point-to-point OAM, T-MPLS removes those IP functions that are not related to transmission. T-MPLS makes full use of the technical advantages of connection-oriented MPLS technology in terms of QoS, bandwidth sharing and differentiated services. It also simplifies complex MPLS control protocol clusters and data planes, removes unnecessary forwarding processing, and is more suitable for packet transmission. demand. T-MPLS adds the concept of a layer network, which can be independent of customer signals and control network signals, and adds OAM and protection switching of transport network characteristics over MPLS. Relationship between T-MPLS technology and MPLS technology T-MPLS inherits some concepts, definitions, and forwarding principles of the MPLS architecture, but also simplifies and expands the MPLS system architecture. T-MPLS borrows the contents and concepts of MPLS and simplifies and expands on the basis of MPLS: it simplifies the complex protocol cluster and control plane of MPLS; does not support PHP, simplifies the data forwarding plane, and does not support label merging (Merging); Expand the mark stack depth; do not limit the depth of the label stack; support bidirectional LSP; add OAM function; increase linear subnet protection and ring network protection, support APS protocol; introduce layer network concept. PBT technology system PBT (ProviderBackboneTransport) is an improvement of the Provider Backbone Bridge (PBB: ProviderBackbone Bridge), which allows configuration of traffic engineering and protection. PBT is almost done by adding routing configurations to the standard Provider Backbone Bridge (PBBN). The main advantages of PBT technology are that the traditional Ethernet address learning, address broadcast and STP functions are disabled. The Ethernet forwarding table is completely configured by the management plane. The connection-oriented feature makes the Ethernet service connectable. Protection switching, OAM, QoS, traffic engineering and other transport network functions; PBT technology promises to be compatible with the hardware of traditional Ethernet bridges, data packets do not need to be modified, and forwarding efficiency is high. Basic technical characteristics of PBT â— Use the carrier MAC (ProviderMAC) plus B-TAG to forward the service, so that the carrier-class Ethernet is controlled by the operator and isolates the user network; â— Add an I-TAG tag to identify a service instance; â— PBT shuts down traditional Ethernet functions such as complex MAC address learning, broadcast, and spanning tree protocols at the carrier network level to avoid flooding of broadcast packets. â— Use ProviderMAC+VLAN ID to forward services, with connection-oriented features, and implement some features required by carrier-class networks, including the functions of carrier-class transport networks such as protection switching and QoS; â— Can be implemented based on the hardware of an existing Ethernet switch. The relationship between PBT and PBB PBT can be fully compatible with the commercial bridge PBB, and PBT can be considered as simplified and expanded on the basis of PBB. On the basis of PBB, PBT removes the connectionless feature of Ethernet, adds Ethernet OAM and connection protection, and data forwarding is relatively simple.
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