Security Precautions - Cisco Catalyst 4500 Series Software Configuration Manual

Modifying the Supervisor Engine Startup Configuration
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For more information on flash memory, see this URL:
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/hardware/configuration/notes/OL_2788.h
tml

Security Precautions

Note the following security precaution when loading from flash memory:
Caution You can only change the system image stored in flash memory from privileged EXEC level on the
console terminal.
Configuring Flash Memory
To configure your switch to boot from flash memory, perform the following procedure. Refer to the
appropriate hardware installation and maintenance publication for complete instructions on installing
the hardware.
Copy a system image to flash memory using TFTP, FTP, or through a VRF interface.
Step 1
Step 2 Save your configurations.
Power cycle and reboot your system to verify that all is working as expected.
Step 3
Controlling Environment Variables
Although the ROM monitor controls environment variables, you can create, modify, or view them with
certain commands. To create or modify the BOOT and BOOTLDR variables, use the boot system and
boot bootldr global configuration commands, respectively. Refer to the "Specify the Startup System
Image in the Configuration File" section in the "Loading and Maintaining System Images and
Microcode" chapter of the Configuration Fundamentals Configuration Guide for details on setting the
BOOT environment variable.
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
3-32
Boot the system from flash memory either automatically or manually
Copy the flash memory image to a network server using TFTP or RCP
Refer to section "Copy Configuration Files from a Network Server to the Router" in chapter
"Managing Configuration Files", of the "Managing Configuration Files Configuration Guide" at the
following URL:
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/config-mgmt/configuration/xe-3e/config-mgmt-
xe-3e-book/cm-config-files.html.
Configure the system to boot automatically from the desired file in flash memory.
You might need to change the configuration register value. See the
Using the boot Command" section on page
configuration register.
Chapter 3 Configuring the Switch for the First Time
"Modifying the Boot Field and
3-28, for more information on modifying the