Perspective Gmpls Technology

As the network continues to expand, the volume of data traffic is growing, business increasingly complex, so that the existing network overwhelmed, people are increasingly unable to endure the best effort transmission mode.

On the other hand, Internet service provider ispinternet service Providers pay more attention to profit than ever before, the Internet urgently needs to expand on demand bandwidth consumption, fast and convenient route choice, Guaranteed quality of service qosquality of the Service, flexible and diverse customization services and many other aspects of rapid development.

It is precisely because of the various requirements of the above driving the integration of IP technology and optical communication technology, the common Multiprotocol label Switching technology (gmpls,generalized multi-protocol label switching) is inevitable.

Multi-Protocol label switching technology MPLS

GMPLS evolved from MPLS, a technology that logically extends from IP through MPLS. MPLS, the Multiprotocol label switching technology, is a kind of exchange technology based on IP technology, which uses the label to guide the high-speed and efficient transmission of data. MPLS adopts integrated mode, which combines IP technology with ATM technology, and combines the high-speed performance, QoS performance, flow control performance and IP flexibility and extensibility of ATM.

MPLS originally came from the third-tier exchange, but it was not confined to a simple third-tier exchange, but stood in a higher perspective. It uses the standard group processing to forward the third-level grouping, and uses the label Exchange to exchange the second-level packet.

MPLS is mainly composed of many components, such as label switching router LSR, label Edge Router ler, label distribution protocol LDP and label Exchange Path LSP. MPLS uses existing routing protocols (such as Open Shortest Path Priority protocol OSPF) to establish the accessibility of the destination network, while using the new control protocol LDP to share tag information among network switches. As a path-oriented technology, MPLS is transmitted through reserved network resources to meet the requirements of different service quality, as is the Exchange path in ATM and Frame Relay networks.

MPLS provides a mechanism for efficient routing and resource reservation, improves the performance of traditional IP routing, increases the throughput of the network, and solves the key problems faced by the current network--high speed, scalability, efficient QoS management and traffic engineering TE. However, with the development of chip technology, the routing query engine based on ASIC can transmit IP packet by wire speed, which reduces the requirement of MPLS for improving performance. So why are people so interested in MPLS? The answer is integration. Today  is using the idea of data networking in areas such as fiber, wireless and voice networks, and MPLS is at the heart of this fusion technology.

Characteristics and advantages of GMPLS

The  in optical communication network is a large number of data streams, and the variable units used are based on wavelength (wavelength), time slot (timeslot) and even band (Waveband). In the interchange of the intermediate node, the optical switch can exchange the data stream as long as it sees the wavelength, time slot or the comparison of the band. Optical fiber is the most obvious and basic switching unit in optical communication networks. Wavelength and optical bands are also a very common switching unit. There is, of course, a time slot switching unit that continues to be the mainstream of optical network hosting services so far.

In the optical communication network, the GMPLS is extended to the MPLS tag, so that the label can be labeled as grouping, time slot, wavelength, optical fiber and so on, so that the label has the true meaning of "universal". On the other hand, Gmpls extends the MPLS label switching path LSP mechanism, enabling the "universal" label and label switching path LSP to support not only the packet switching interface (psc,packet switch capable), the second layer switching interface (L2SC,LAYER2 Switch capable), you can also support slot switching interfaces (Tdmc,time Division multiplexing capable), wavelength switching interfaces (LSC,LAMBDA switch capable), and fibre Exchange interfaces (FSC, Fiber switch capable).