Failover: Keeping the Connection
Failover is the SD-WAN term for automated switching from a primary WAN source to a secondary or back-up WAN. The Internet connection on any network comes in through a WAN (Wide Area Network). A WAN connection can originate from any of several sources: cable, DSL, fiber, satellite, or even cellular. Failover technology is built into a router, but not all routers are failover capable, and different routers have different levels of failover. Every router takes an incoming WAN connection and distributes it to connected users on the LAN (Local Area Network). A failover router can manage two or more incoming WAN sources and dynamically switch between them.