Specifying The Startup System Image; Understanding Flash Memory - Cisco 7609 Configuration Manual

Modifying the Supervisor Engine Startup Configuration
Verifying the Configuration Register Setting
Enter the show version EXEC command to verify the current configuration register setting. In
ROM-monitor mode, enter the o command to verify the value of the configuration register boot field.
To verify the configuration register setting, perform this task:
Command
Router# show version | include Configuration register
In this example, the show version command indicates that the current configuration register is set so that
the router does not automatically load an operating system image. Instead, it enters ROM-monitor mode
and waits for user-entered ROM monitor commands. The new setting instructs the router to load a system
image from commands in the startup configuration file or from a default system image stored on a
network server.
Router1# show version | include Configuration register
Configuration register is 0x2102
Router#

Specifying the Startup System Image

You can enter multiple boot commands in the startup configuration file or in the BOOT environment
variable to provide backup methods for loading a system image.
Note Store the system software image in the sup-bootflash: or slot0: device, not in the bootflash: device.
Store the boot loader image in the bootflash: device.
The BOOT environment variable is also described in the "Specify the Startup System Image in the
Configuration File" section in the "Loading and Maintaining System Images and Microcode" chapter of
the Cisco IOS Configuration Fundamentals Configuration Guide.

Understanding Flash Memory

The following sections describe Flash memory:
•
•
•
The descriptions in the following sections applies to both the bootflash device and to removable Flash
Note
memory cards.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
3-24
Flash Memory Features, page 3-25
Security Features, page 3-25
Flash Memory Configuration Process, page 3-25
Chapter 3 Configuring the Cisco 7600 Series Router for the First Time
Purpose
Displays the configuration register setting.
78-14064-04