2017.12.06 10:32:26 Source：
There are various SD-WAN vendors and solutions on the market today, and they typically include the following features:
A central controller offering SD-WAN command and control, which can run on the client or hosted in the cloud, typically includes the following features:
Acts as a repository of access nodes
Manage the network topology
Set QoS and access policy
Report usage and performance
A set of enterprise-side access nodes that can operate as a single device or virtual network function (VNF) on the server. Most access nodes are listed below:
Central controller contact and access to configuration information zero contact debugging process
Implement Overlay Virtual Network Routing and Tunneling Engine
A hybrid WAN capability that can send traffic to multiple uplinks, allowing both speed and resiliency to be superimposed
Firewall and security features, including encryption
QoS and access policy enforcement, including application-level monitoring
WAN optimization, including one or more of the following: Caching, compression, error correction, prioritization, and load balancing across hybrid WAN interfaces
Network packet loss and latency measurements, which will be reported to the end user and also used by the hybrid WAN and WAN optimization listed above.
To build a network using SD-WAN, enterprise users first need to configure the networks and policies they need to use the controller. Enterprise users can then deploy access nodes on each site, and when all the nodes are installed and activated, they are connected to the central controller for policy configuration on the network. Enterprise users can now dynamically define and implement VPNs using a variety of connectivity media: wired broadband, xDSL, GPON, LTE wireless, and even L3VPN.