When using the Explicit Failover option for a virtual switch with multiple uplinks, ESX determines the uplink to use in a failover event by?
a specified list
using beacon probing to discover which uplink has the shortest route
using the reported uptime to determine which uplink to select
using link state tracking to see which uplinks are connected
Use explicit failover order — Always use the highest order uplink from the list of Active adapters which passes failover detection criteria.