Automatic Hot Failover handoff − SpeedFusion Bonding monitors connections and automatically turns control over to Hot Failover when links become unstable.
Where do I find more information about “become unstable”?
The particular use case I’m looking for is the following:
provider A guarantees bandwidth at a high cost
provider B has no bandwidth guarantees at a low cost
Whenever the bandwidth of provider B goes below x MB/s the switch to provider B should be made.
Peplink devices monitor WAN link characteristics, they do not actively monitor the amount of bandwidth currently available on a link.
However, if we assume that when WAN link B is low bandwidth the link will get saturated and so latency will rise considerably - then you can use that as a trigger for SpeedFusion to use an alternative WAN link (A in your Case).
In effect then, WAN link B will be removed from the speedfusion bonded VPN when it gets saturated (or when it has run out of bandwidth), and WAN A will be used until WAN B’s latency drops.