Cisco Cisco Packet Data Gateway (PDG)
System Operation and Configuration
▀ Understanding the ASR 5500 Boot Process
▄ ASR 5500 System Administration Guide, StarOS Release 18
28
Understanding the ASR 5500 Boot Process
Part of the configuration process requires that you allocate hardware resources for processing and redundancy.
Therefore, before you configure the system, it is important to understand the boot process which determines how the
hardware components are brought on line.
Therefore, before you configure the system, it is important to understand the boot process which determines how the
hardware components are brought on line.
The following flowchart shows each step in the startup process. For additional information about system configuration
files, refer to the Understanding Configuration Files section.
files, refer to the Understanding Configuration Files section.
Figure 2.
ASR 5500 Process Flowchart
The following steps describe the system’s boot process:
Step 1
When power is first applied to the chassis, or after a reboot, only the MIO/UMIOs in slot 5 and slot 6 receive power.
Step 2
During the startup process, the MIO/UMIO performs a series of power-on self tests (POSTs) to ensure that its hardware
is operational.
is operational.
Step 3
If the MIO/UMIO in slot 5 successfully executes all POSTs, it becomes the active MIO. The MIO in slot 6 becomes the
standby card. If there is a problem with the MIO in slot 5, the MIO in slot 6 becomes the active MIO.
standby card. If there is a problem with the MIO in slot 5, the MIO in slot 6 becomes the active MIO.