IBM 12.1(22)EA6 - Manual (Page 52)

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Cisco Systems Intelligent Gigabit Ethernet Switch Modules for the IBM BladeCenter, Software Configuration Guide
24R9746
Chapter 3 Assigning the Switch IP Address and Default Gateway
Modifying the Startup Configuration
Booting a Specific Software Image
By default, the switch attempts to automatically boot the system using information in the BOOT
environment variable. If this variable is not set, the switch attempts to load and execute the first
executable image it can by performing a recursive, depth-first search throughout the flash file system. In
a depth-first search of a directory, each encountered subdirectory is completely searched before
continuing the search in the original directory. However, you can specify a specific image to boot.
Beginning in privileged EXEC mode, follow these steps to configure the switch to boot a specific image
during the next boot cycle:
To return to the default setting, use the no boot system global configuration command.
Controlling Environment Variables
With a normally operating switch, you enter the boot loader mode only through a service port connection
at 9600 bps. Use the BladeCenter management application to restart the switch. When the switch
restarts, send ESC sequence characters to the service port to stop the autoboot.
You should then see the boot loader Switch: prompt. The boot loader performs low-level CPU
initialization, performs POST, and loads a default operating system image into memory.
The switch boot loader software provides support for nonvolatile environment variables, which can be
used to control how the boot loader, or any other software running on the system, behaves. Boot loader
environment variables are similar to environment variables that can be set on UNIX or DOS systems.
Environment variables that have values are stored in the flash file system in various files as shown in
Table 3-3 .
Command Purpose
Step 1 configure terminal Enter global configuration mode.
Step 2 boot system filesystem:/file-url Configure the switch to boot a specific image in flash memory during the
next boot cycle.
• For filesystem:, use flash: for the system board flash device.
• For file-url, specify the path (directory) and the name of the bootable
image.
Filenames and directory names are case sensitive.
Step 3 end Return to privileged EXEC mode.
Step 4 show boot Verify your entries.
The boot system global command changes the setting of the BOOT
environment variable.
During the next boot cycle, the switch attempts to automatically boot the
system using information in the BOOT environment variable.
Step 5 copy running-config startup-config (Optional) Save your entries in the configuration file.