NIC teaming options generally come in three common configurations:
Adapter Fault Tolerance (AFT);
Switch Fault Tolerance (SFT), also sometimes known as Network Fault Tolerance (NFT);
and Adaptive Load Balancing (ALB).
For AFT, SFT, and ALB, you may specify which adapters in a team you
want to use as the primary and secondary adapters. The primary one
is the main adapter used in a team. For AFT/SFT, the primary one is
the only adapter used until a failure occurs. For ALB, the primary
one is the adapter that both transmits and receives. For ALB+RLB,
the primary adapter is the only adapter that receives non-IPv4
traffic. In a team of more than two adapters, the secondary adapter
fills the primary's role if the primary adapter fails. Also, fail
back will not occur unless the primary has been specified. If the
priority is not specified before the team is activated, the adapter
with the highest supported speed is chosen. If all adapters support
the same speed, the last one added is the primary adapter.
Note: SFT uses only one team. Only 802.3ad DYNAMIC mode allows failover between teams.