System Power-Up; System Boot Process - Cisco ASR 5500 Installation Manual

System Power-up

This chapter describes the boot process that occurs when the system is first powered up.
Important
This chapter includes the following sections:
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System Boot Process

The boot process is initiated after power is applied to the chassis.
Step 1
When power is first applied to the chassis, the MIO/UMIOs in slots 5 and 6 and all fan trays are the first to receive power.
Once the software is running, power is then quickly applied to the remaining cards in the system.
The fans in the fan trays initially rotate at medium speed until the first MIO completes its boot up. If no
Important
MIO/UMIO boots successfully within a few minutes, the fan speed increases to 100%.
Step 2 During the startup process, each card performs a series of Power-On Self Tests (POSTs) to ensure that the hardware is
operational. These tests also verify that the card meets all license requirements to operate on this chassis.
Step 3 If the MIO/UMIO in slot 5 successfully executes all POSTs, it becomes the active chassis management MIO/UMIO for
the system. The MIO/UMIO in slot 6 becomes the standby.
Important If the MIO/UMIO in slot 5 fails to boot, the MIO/UMIO in slot 6 automatically becomes the active chassis
management MIO.
Step 4 The active MIO/UMIO begins loading the operating system software image that is designated in the boot stack. The
boot stack entries are contained in the boot.sys file that resides on the MIO/UMIO's flash device.
The standby MIO/UMIO observes the active card's startup. If the file on the active card is loading normally, the standby
MIO/UMIO boots from the active card's image. If the active MIO/UMIO experiences a problem during this phase, the
The system boot process is governed by StarOS licenses. Refer to Chassis Universal License Requirements
for additional information on the effect licenses and card types have on the boot process.
System Boot Process, page 87
Applying Power to the Chassis, page 88
Verifying System Startup, page 89
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ASR 5500 Installation Guide
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