Cisco Systems EA6500 Manual De Usuario

The ROM monitor has these features:

Power-on confidence test

Hardware initialization

Boot capability (manual boot and autoboot)

Debug utility and crash analysis

Monitor call interface (EMT calls—the ROM monitor provides information and some functionality 
to the running software images through EMT calls)

File system (the ROM monitor knows the simple file system and supports the newly developed file 
system through the dynamic linked file system library [MONLIB])

Exception handling

The switch uses a 16-bit software configuration register, which allows you to set specific system 
parameters. Settings for the software configuration register are written into NVRAM. 

Following are some reasons for changing the software configuration register settings:

To select a boot source and default boot filename.

To enable or disable the Break function.

To control broadcast addresses.

To set the console terminal baud rate.

To load operating software from Flash memory.

To recover a lost password.

To allow you to manually boot the system using the boot command at the bootstrap program prompt.

To force an automatic boot from the system bootstrap software (boot image) or from a default system 
image in onboard Flash memory, and read any boot system commands that are stored in the 
configuration file in NVRAM. 

 lists the meaning of each of the software configuration memory bits, and 

 defines the 

boot field.

The recommended configuration register setting is 0x2102. If you configure a setting that leaves break 
enabled and you send a break sequence over a console connection, the switch drops into ROMMON. 

 

00 to 03

0x0000 to 0x000F Boot field (see 

06

0x0040

Causes system software to ignore NVRAM contents

07

0x0080

OEM

2

 bit enabled

08

0x0100

Break disabled

09

0x0200

Use secondary bootstrap

10

0x0400

Internet Protocol (IP) broadcast with all zeros