First of all, the SD - WAN is in the field of WAN extension of SDN thought. In addition to the research object of network (SDN geared to the needs of the local LAN, SD, WAN WAN), the "turn accused of separation" is the basic idea of inheritance. In addi

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