Wan link selection for SD-WAN services

A software-defined wide area network (SD-WAN) edge device comprising:

• configuration data configuring respective interfaces for a plurality of a wide area network (WAN) links to an SD-WAN service;
• and
• an SD-WAN application executing on processing circuitry and configured to:
• obtain a first service level agreement (SLA) rule that matches a first application, the first SLA rule having a first priority that indicates a priority of the first application;
• obtain a second SLA rule that matches a second application, the second SLA rule having a second priority that indicates a priority of the second application;
• assign the first application and the second application to a first WAN link of the plurality of WAN links;
• and
• in response to a determination that the first WAN link has violated the first SLA rule that matches the first application, while the first application and the second application are assigned to the first WAN link, reassign the second application to a second WAN link of the plurality of WAN links.

A method comprising:

• obtaining, for a software-defined wide area network (SD-WAN) system having a plurality of a wide area network (WAN) links for an SD-WAN service, a first service level agreement (SLA) rule that matches a first application, the first SLA rule having a first priority that indicates a priority of the first application;
• obtaining, for the SD-WAN system, a second SLA rule that matches a second application, the second SLA rule having a second priority that indicates a priority of the second application;
• assigning, for the SD-WAN system, the first application and the second application to a first WAN link of the plurality of WAN links;
• and
• in response to determining that the first WAN link has violated the first SLA rule that matches the first application, while the first application and the second application are assigned to the first WAN link, reassigning, by the SD-WAN system, the second application to a second WAN link of the plurality of WAN links.