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Figure 1 explains the ZTP staging flow of a Dell switch. ZTP capability is a function of the operating system involved, which in this whitepaper is SONiC. However, Dell switches are called open network switches. The switches are factory default equipped with a tiny operating system (OS) called Open Network Install Environment (ONIE). ONIE is installed on the switch and is the first OS that is booted when you turn on the switch. ONIE gives the switch the openness to install a third-party NOS. This whitepaper concentrates on installing SONiC.
Take a closer look into what happens when you power on a factory default switch which has ONIE installed. The following numbers correspond to the numbers in Figure 1.