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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 used in this chapter, refer to the Command
Reference—Catalyst 4000 Family, Catalyst 2948G, and Catalyst 2980G Switches.
This chapter consists of these sections:
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Understanding How the Switch Boot Configuration Works
These sections describe how the boot configuration works on the Catalyst 4000 family, 2948G,
and 2980G switches:
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Understanding the Boot Process
The boot process involves two software images: ROM monitor and supervisor engine system code. When
the switch is powered up or reset, 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.
78-12647-02
Understanding How the Switch Boot Configuration Works, page 28-1
Default Switch Boot Configuration, page 28-4
Setting the Configuration Register, page 28-4
Setting the BOOT Environment Variable, page 28-7
Setting and Clearing the CONFIG_FILE Environment Variable, page 28-8
Displaying the Switch Boot Configuration, page 28-9
Understanding the Boot Process, page 28-1
Understanding the ROM Monitor, page 28-2
Understanding the Configuration Register, page 28-2
Understanding the BOOT Environment Variable, page 28-3
Understanding the CONFIG_FILE Environment Variable, page 28-3
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
C H A P T E R
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28-1
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