Draytek Vigor2860 User Manual page 90

Active When
After finished the above settings, click OK to save the settings.
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Load Balance: Check this box to enable auto load balance
function for such WAN interface.
When the data traffic is large, the WAN interface with the
function enabled will balance the data transmission
automatically among all of the WAN interfaces in connection
status.
Failover – Choose it to make the WAN connection as a backup
connection.

WAN Failure – When the active WAN failed, such WAN
will be activated as the main network connection.

Traffic Threshold – When the data traffic of active
WAN reaches the traffic threshold (specified here), the
failover WAN will be enabled automatically to share the
overloaded data traffic.
If you choose Failover as the Active Mode, Active When will
appear. Please specify which WAN will be the Backup
interface.
Any of the selected WAN disconnect – Such backup WAN will
be activated when any master WAN interface disconnects.
All of the selected WAN disconnect – Such backup WAN will
be activated only when all master WAN interfaces
disconnect.
Vigor2860 Series User's Guide