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Ideas on how to cutover to a backup line when primary goes down

We have a location that needs to have a backup WiMax signal in the event that our primary internet goes down.  It seems our provider is suggesting SD-WAN along with the backup line.  Is this necessary?  Is there another way to get a device that cuts over to the backup line to supply bandwidth when the primary goes down.  Or should I consider SD-WAN along with the backup line?  Any comments?
RoutersNetworking Hardware-OtherTelecommunications* SD-WAN

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Aaron Tomosky

8/22/2022 - Mon