A. port security
B. fabric binding
C. IVR
D. port tracking
E. FICON

A. Two peer devices： the vPC peers of which one is primary and one is secondary and are part of a vPC domain.
B. A Layer 3 Gigabit Ethernet link called peer-keepalive link to resolve dual-active scenarios
C. A redundant 10 Gigabit Ethernet PortChannel called a peer link to carry traffic from one system to the other when needed
D. vPC member ports forming the PortChannel
E. A dot1q trunk between the vPC peers
F. A management port that can be used as peer-keepalive link to resolve dual-active scenarios.