Mpls Data Forwarding The Study To Achieve

The Internet is growing at an amazing speed in recent years and the applications over the Internet are becoming wider and wider. People can never be satisfied with current services, such as E-mail and Internet Exploration. They need better and more services like broad band, multimedia, Qos etc. All these items bring ISPs with new challenges. In the 90's, ATM proved to be super excellent solution for performance and traffic engineering to ISP. And many carriers use to think it is very economical to implement Internet multi-service in ATM network. But pure ATM based network is impracticable in reality. In fact, today 's ATM network is used to carry IP based traffic. So people wish to combine IP traffic and ATM function in one network technology. Therefore, MPLS is put to agenda and is considered to be a promising technology. MPLS stands for "Multi-protocol Label Switching", it integrates the label-swapping paradigm with network-layer routing, It brings the TE (traffic engineering) of ATM to packet-based network and also it can run over nearly any transport medium (ATM, FR, Ethernet…) instead of being tired to a specific layer-2 encapsulation. In general, MPLS system will be divided into two basic parts: Control Unit and Forwarding Unit. Control Unit is in charge of label distribution, routing, label forwarding table establishment, LSP establishment and tearing down. Forwarding Unit will forward the labeled frame in regard to the label forwarding table. In the paper, we will discuss deeply according to the designed the function within the two basic parts.In this article, we review the basic protocol of MPLS and its architecture. Then we design and implement a relative integral MPLS protocol stack. It support almost all the functions of MPLS( i.e. LDP, Label Switch, LSP establishment etc.). After that, we realize routing,data forwarding(unicast,multicast and broadcast) and fault recovery. In order to demonstrate the performance of our protocol stack, we do a lot of experiments that will be show in the sixth chapter.