Cisco Systems OL-11497-03 manual Overview of the Boot Process

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-resetlogic 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.

	Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03		3-39