Design and analysis of multi-protocol label switching networks

Service providers must consider lots of factors while designing their backbone such as ensuring high performance, scalability, robustness, coping with new age technologies. MPLS is a preferred technology by most of the service providers because of the advantages in these topics. In addition, as using MPLS, different services which service providers want to offer, e.g. voice over IP, video and TV applications, internet access, point to point services, layer 3 and layer 2 vpn services can be provided in same network. MPLS reduces networking costs and improves speed and sorts of the services. MPLS enables carrying IP over ATM. MPLS is also convenient technology for the service providers having ATM backbones. OSPF or IS-IS can be used as an interior gateway routing protocol in an MPLS network. Interior gateway routing protocols are used to distribute the IP forwarding routes to all the routers in the network. BGP is used to communicate between the AS of the service provider and the different ASs. LDP distributes the label information to the all routers in the network. LDP learns the network information from OSPF or IS-IS.