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bond
active-backup
The active-backup, balance-tlb, and balance-alb modes do not require any specific configuration of the network switch.
Active-backup (active-backup): Only one NIC slave in the bond is active. A different slave becomes active if, and only if, the active slave fails. The single logical bonded interface’s MAC address is externally visible on only one NIC (port) to avoid distortion in the network switch. This mode provides fault tolerance.