SDH point-to-point connection with MPLS VPN - what's the difference?

　　MPLS VPN is combined with the advantages of ATM and IP technology is an important application of MPLS technology, mainly divided into the second and third floors MPLS VPN. MPLS VPN is equivalent to the simulation on the Internet on the second floor out of it the second line similar to the ATM/FR VPN. And three layers of MPLS VPN is routing table processing capabilities of the network edge router is basic to the operators. Now the world's largest operator on the implementation of BGP/MPLS VPN (RFC 2547 bis) belong to three layers of MPLS VPN.

　　Because based on IP network, the bandwidth is very big, range is very wide, can be deployed in the global scope, the price is relatively cheap. Though physically not like SDH is isolated, but are logically isolated, MPLS VPN - can run on any special line, it is one of the biggest advantages of VPN security control is easy. Therefore, the security of MPLS VPN is unassailable.

　　The characteristics of MPLS, VPN:

　　1) Safety

　　MPLS VPN - with routing isolated, address, and a variety of means such as information hiding, provides resistance to attack and deception, so the MPLS VPN can provide similar security guarantees to ATM/FR VPN.

　　2) Extensibility

　　MPLS VPN - has the very strong extensibility. On the one hand, a lot can accommodate the number of VPN in MPLS network, on the other hand on the number of user node due to the help of BGP protocol for members of the distribution and management, in the same VPN users unlimited number of nodes, easy to expand, and can realize any node of direct communication with any other node. Especially in realizing the full network communication between user node does not need to configure the user a detailed circuit between nodes, users only need one side port/line access networks, avoid the problem of N square extensibility.

　　3)The topological flexibility

　　MPLS VPN can through the network side parameters adjustment, is easy to implement user nodes between the star and full mesh as well as any other form of logical topology, in order to meet the requirements of user management between the internal nodes.

　　4)The network reliability

　　Due to the global IP infrastructure based on Internet is very developed, so rely on it to do business of MPLS VPN, naturally with large bandwidth, multiple nodes, routing, abundant network and transport resources to ensure the reliability of the network.

　　SDH line bandwidth limited, and expensive, many users are currently rented MSTP lines, MSTP biggest advantage is cheap, and expansion is very convenient, you want how much bandwidth can get how much bandwidth.

　　You can say that SDH is in the solution, and MPLS VPN - is a high-end solution, enterprise can according to your requirements, choose the most suitable for their own network office solutions.