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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 3 Configuring the Router for the First Time
Modifying the Supervisor Engine Startup Configuration
Flash Memory Features
The flash memory components allow you to do the following:
• Copy the system image to flash memory using TFTP.
• Copy the system image to flash memory using rcp.
• Boot the system from flash memory either automatically or manually.
• Copy the flash memory image to a network server using TFTP or rcp.
• Boot manually or automatically from a system software image stored in flash memory.
Security Features
The flash memory components support the following security features:
• Flash memory cards contain a write-protect switch that you can use to protect data. You must set the
switch to unprotected to write data to the Flash PC card.
• The system image stored in flash memory can be changed only from privileged EXEC level on the
console terminal.
Flash Memory Configuration Process
To configure your router to boot from flash memory, follow these steps:
Step 1 Copy a system image to flash memory using TFTP or rcp (refer to the Cisco IOS Configuration
Fundamentals Configuration Guide, Release 12.2, “Cisco IOS File Management,” “Loading and
Maintaining System Images,” at this URL:
http://www.cisco.com/en/US/docs/ios/12_2/configfun/configuration/guide/fcf008.html
Step 2 Configure the system to boot automatically from the file in flash memory. You might need to change the
configuration register value. See the “Modifying the Boot Field and Using the boot Command” section
on page 3-22, for more information on modifying the configuration register.
Step 3 Save your configurations.
Step 4 Power cycle and reboot your system to ensure that all is working as expected.
CONFIG_FILE Environment Variable
For class A flash file systems, the CONFIG_FILE environment variable specifies the file system and
filename of the configuration file to use for initialization (startup). Valid file systems can include
nvram:, disk0:, and sup-bootflash:.
For detailed file management configuration information, refer to the Cisco IOS Configuration
Fundamentals Configuration Guide at this URL:
http://www.cisco.com/en/US/docs/ios/12_2/configfun/configuration/guide/ffun_c.html
After you save the CONFIG_FILE environment variable to your startup configuration, the router checks
the variable upon startup to determine the location and filename of the configuration file to use for
initialization.
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