Traffic Engineering Based on MPLS Technology

Service providers are facing challenges in supporting IP Services, which requires that they can make existing networks have traffic engineering management. Service providers require that traffic engineering in the IP over ATM mode be reflected in a pure IP network. MPLS is a management technology that provides traffic engineering when both the ATM and the pure IP network coexist and avoids two separate networks.
Service providers all over the world are seeking more reliable and differentiated services to keep up with the evolving Internet and increasing user needs, therefore, service providers must be able to strictly control the allocation of network resources and network throughput. The process of ing communication traffic on the physical topology of the network, and locating the resources for these communication traffic are called traffic engineering. It is one of the most difficult tasks for service providers today.
The ideal traffic engineering solution is to allocate network resources based on business needs. It should have the method of ing communication traffic to special paths and dedicated resources to achieve load balancing. A network with traffic engineering can be implemented using connection-oriented technologies, such as ATM and frame relay. However, networks that mix multiple technologies need to be managed by their respective network management systems, causing great inconvenience in operations.
A pure IP network can implement traffic engineering based on the MPLS protocol, and obtain benefits by providing different services and controllable networks. We urgently need a network with a traffic engineering design. The network should be able to queue network resources according to traffic requirements, and create a deterministic network at a lower cost, and provide different business types through SLA. Therefore, in the next generation of IP networks, traffic engineering will become one of the most widely used MPLS protocols.
MPLS Multi-Protocol Label exchange integrates IP routing technology and ATM So that the above traffic engineering mode can be deployed in an IP-based network, including the mode in which the ATM Network carries the IP service. It allows you to create a path for the network data stream in advance. These reserved paths occupy special network resources. They can be manually set to an explicit path or automatically generate the optimal path as needed.
Basically speaking, MPLS is similar to the ATM technology. It is specially designed for IP addresses, but also supports different transmission media such as ATM and PoS. Mark the exchange path LSP). Data streams are mapped to the corresponding path based on traffic requirements and link bearer capabilities. The path through which the data stream is forwarded depends on the tag assigned to the data stream. Therefore, unlike the traditional IP address, the label in MPLS is used to transmit data packets in the network along the selected path. Currently, MPLS is available in two control protocols: CR-LDP and RSVP build paths, which are equally effective in supporting traffic engineering. In addition, both control protocols support implicit and explicit routing.
The backbone of the traffic engineering is capable of managing vro resources, which is required for each vro in the network. In addition, the capacity and performance of each vro in the network must be shared across the entire network, so that the LSR can be integrated into an edge vroler with MPLS functions) or edge labels can be switched to the edge-lsr of the vroedge) the centralized traffic engineering processing function in LSP computing. It should be clearly pointed out that the traffic engineering processing function must be able to access the following information: LSP terminal node(That is, the destination IP address), a complete network topology to calculate the potential path, and the resource availability of all routers in the network to calculate the capacity of the path.