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Modifying the Switch Boot Configuration
This chapter describes how to modify the switch boot configuration, including the BOOT environment
variable and the configuration register on the Catalyst enterprise LAN switches.
Note
For complete syntax and usage information for the commands that are used in this chapter, refer to the
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Command
Reference.
This chapter consists of these sections:
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Understanding How the Switch Boot Configuration Works
The following sections describe how the boot configuration works on the Catalyst 4500 series, 2948G,
2948G-GE-TX, and 2980G switches.
Understanding the Boot Process
The boot process involves two software images: ROM monitor and supervisor engine system code. When
you power up or reset the switch, the ROM-monitor code is executed. Depending on the nonvolatile
RAM (NVRAM) configuration, the switch either stays in ROM-monitor mode or loads the supervisor
engine system code.
Two user-configurable parameters determine how the switch boots: the configuration register and the
BOOT environment variable. The configuration register is described in the
Configuration Register" section on page
"Understanding the BOOT Environment Variable" section on page
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
Understanding How the Switch Boot Configuration Works, page 32-1
Default Switch Boot Configuration, page 32-4
Setting the Configuration Register, page 32-4
Setting the BOOT Environment Variable, page 32-6
Setting and Clearing the CONFIG_FILE Environment Variable, page 32-7
Displaying the Switch Boot Configuration, page 32-8
C H A P T E R
32-2. The BOOT environment variable is described in the
32-3.
32
"Understanding the
32-1
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