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Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
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Chapter 3 Installing the Router
IOS Software Configuration for the Router
Overview of the Boot Process
The example below assumes that the router is plugged into a power source and the
router is running, blower module fans are audible, and alarm card ENABLED
LEDs are lit up.
The following is an example of a typical boot process:
• The RP MBus module receives the correct DC voltage and starts executing
MBus software.
• The RP determines the router configuration by sending a message via the
alarm card requesting all installed devices to identify themselves. Their
responses provide slot numbers and card and component types. The RP, line
cards, CSCs, and SFCs are then powered up.
• The power-on-reset logic of the RP is delayed long enough to allow power
and both local and CSC clocks to stabilize.
• After the power-on reset logic is released, the RP begins to execute the ROM
monitor software.
• If the ROM monitor is configured to autoboot, it automatically loads and
boots the Cisco IOS software.
• If the ROM monitor is not configured to autoboot, boot the Cisco IOS
software manually. See the “Manually Booting the System” section on
page 3-47.
• When the Cisco IOS software boots, it polls all other cards in the system,
powers them up, and loads the Cisco IOS software they require.
Starting the Router and Observing Initial Conditions
Observe the following conditions the first time you start your router:
• Power cables to the PDU are fully connected to both the PDU and the power
source, and are secured with appropriate strain relief.
• Empty card slots or card bays are filled with card blanks. This ensures proper
air flow through the chassis and electromagnetic compatibility (EMC).
• All cards are fully inserted in their cages and bays.
• All captive screws are tightened.