Cisco WS-C4003 Software Guide - Page 419
Modifying the Switch Boot Configuration, Understanding How the Switch Boot Configuration Works
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28 C H A P T E R 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: • 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 How the Switch Boot Configuration Works These sections describe how the boot configuration works on the Catalyst 4000 family, 2948G, and 2980G switches: • 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 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 Software Configuration Guide-Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4 28-1
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