Cisco AS5800 Specifications download pdf (Page 33)

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Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide

DOC-7810814=

Chapter 1 Introduction

Cisco AS5800 First-Time Boot

When you power ON your Cisco AS5800, it goes through the following boot sequence:

1. A power-on self-test diagnostics program verifies basic operation of the CPU, memory, and

interfaces.

2. The system bootstrap software executes and searches for a valid Cisco IOS software image. The

Cisco IOS software source image is determined by the configuration register setting. The

factory-default setting for the configuration register is 0x2102, which indicates that the router

should attempt to load a Cisco IOS software image from Flash memory or over the network

(depending on boot configuration commands).

3. If, after five attempts (if netbooting) or one attempt (for a Flash memory boot), a valid Cisco IOS

software image is not found in Flash memory, the router reverts to boot the ROM mode, which is

used to install or upgrade a Cisco IOS software image.

4. If a valid Cisco IOS software image is found, the router searches for a valid configuration file.

5. If a valid configuration file is not found in nonvolatile random-access memory (NVRAM), the router

runs the setup script (also called the system configuration dialog), which enables you to configure

your software manually. For normal router operation, you must have a valid Cisco IOS software

image in Flash memory and a configuration file in NVRAM.

Cisco AS5800 Boot Process

The system boot process consists of two-stages. When the system is first powered on, the trunk cards

and modem cards must receive a small image from the dial-shelf controller card, which is then launched

by the ROM monitor. This allows the feature cards the ability to “talk” to the dial-shelf controller card

and download the bootloader program. Communication is then made on the backplane, that allows each

feature cards to talk with the router shelf the Cisco IOS software image. All cards download the

bootloader image simultaneously, which then allows them to “talk” across the proprietary Fast Ethernet

connection and request the image needed for each card. A hello message is exchanged between the router

shelf and the dial shelf.

Because of this two-step boot process, when you first power ON your system, you might not see the

feature card LEDs light immediately.

Dial-Shelf Booting

The dial shelf boots up independently from the router shelf. The dial-shelf controller card (DSC) is the

first component to boot up. It is set for autobooting from internal Flash memory. If, however, a PCMCIA

Flash memory card is present, the DSC tries to first boot from the card, beginning with slot 0.

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Cisco AS5800 Specifications Page 33