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Understanding the System Boot Process

The following figure provides a flowchart that explains each step in the startup process.

Figure 1: Boot Process Flowchart

Step 1

When power is first applied to the chassis, or after a reboot, only the SMC in slots 8 and 9 receive power. Therefore, the

SMCs are the first cards to boot and their LEDs are the first to light up. Once the system confirms that cards are located

in slots 8 and 9, power is quickly applied to the SPIOs in slots 24 and 25.

Step 2

During the startup process, each card performs a series of Power-On Self Tests (POSTs) to ensure that the hardware is

ASR 5000 Installation Guide

Applying Power and Verifying the Installation