The stability of the public network is usually not as good as the dedicated line, so the Virtual WAN is loaded with load balancing on the logical lines of multiple lines. Dynamically distribute traffic and stabilize the aggregation line according to the load conditions of the current lines. On the other hand, Virtual WAN can aggregate Internet connections from different SPs to improve stability.
SD-WAN
Finally got to the point. The Virtual WAN mentioned earlier is actually part of the SD-WAN. It is now widely accepted that SD-WAN should have the following four functions:
Support a variety of connection methods, MPLS, frame relay, LTE, Public Internet and so on.
The SD-WAN combines the Virtual WAN with the traditional WAN to make an overlay on top of it. For the application, there is no need to know exactly what the underlying WAN connection is. In a scenario where a traditional WAN is not required, the SD-WAN is a Virtual WAN.
Ability to dynamically select links between multiple connections for load balancing or resource resiliency.
Similar to Virtual WAN, multiple paths are dynamically selected. If SD-WAN is connected to both MPLS and the Internet, some important application traffic, such as VoIP, can be offloaded to MPLS to ensure application availability. For some application traffic that is less sensitive to bandwidth or stability, such as file transfers, it can be offloaded to the Internet. This reduces the reliance of enterprises on MPLS. Or, the Internet can serve as a backup connection for MPLS. When MPLS fails, at least the WAN network of the enterprise is not disconnected.
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