MPLS VPN allows multiple sites to interconnect plainly through the network service provider. A network service provider can support a number of different IP VPN. Each appears as a private network to its users and independent from other networks. In a VPN, every site can send IP packets to another site in the same VPN. Every VPN is linked to one or more VPN routes or forwarding cases. This consists of IP routing table, a Cisco device and a group of interfaces that make use of the forwarding table.The router maintains separate routing tables which prevent information to be transmitted outside the Virtual Private Network and allows similar subnet to be utilized in several virtual private networks, without causing more problems on duplicate IP addresses. The Multiprotocol router distributes VPN routing information by means of extended communities. Hence, MPLS Solution is suitable when it comes to networking and service management applications. It is a management system for the network that defines and controls the virtual private network services for the service providers. MPLS VPN allows providers to provide and manage applications of the intranet and extranet Virtual Private Networks. The technology provides the kind of operations management that regards flow through in the provision of services and service level agreements, the measurement of MPLS IP VPN environments and service auditing. Multiprotocol Label Switching is a new industry standard of today. MPLS VPN solution focuses on audit and control connections as well as provision between customer routers via the service provider’s network. MPLS product addresses only the edge routers of the provider and the customer. CE router is linked to a PE router so that client’s traffic is encapsulated and sent to other customer edge routers transparently, thus producing a virtual private network. Customer edge routers advertise routes to Virtual Private Networks for all units in the site. MPLS VPN solution engine has access to configuration files of the CE and PE to compute unimportant changes to those files that are needed to provide a service at the PE-CE.MPLS VPN is scalable with emphasis on VPN technology that allows providers to plan, set provisions and manage IP VPN services according to customer service level agreements. MPLS VPN complements with MPLS-based VPN solutions from Cisco by simplifying service assurance, provisioning and billing processes, hence reducing cost of operating and deploying VPN services. MPLS VPN consists of a number of sites that are linked through network service provider based on MPLS. Each site has one or more customer edge, which is connected to one or more provide edge. PEs use multi-protocol to communicate with each other dynamically. It does not require that the number of IP addresses used in the two VPNs be mutual exclusive as the PEs translates IP addresses into IP VPN entities. The IP addresses used in VPN should be exclusive of the group of addresses applied in the service provider network. Each EC must deal with the PEs where it is directly connected. Hence, the IP addresses of PEs should not be duplicated in any virtual private network.
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