Recovering Boot And System Images; Recovering Boot And System Images; Using The Xmodem Command; Configuration Register - Cisco VG204 Software Configuration Manual

Recovering Boot and System Images

Table A-1
Command
meminfo
boot commands
b
b flash: [filename] Attempts to boot the image directly from the first partition of flash memory. If you

Recovering Boot and System Images

If your voice gateway experiences difficulties and no longer contains a valid Cisco IOS software image
in flash memory, you can recover the Cisco IOS image using one of the following ROM monitor
commands:
•

Using the xmodem Command

The xmodem command establishes a connection between a console and the voice gateway console port
for disaster recovery if both the boot and system images are erased from flash memory.
xmodem [filename]—Establishes an xmodem connection between the console and the voice gateway.
The optional parameter argument filename specifies the source file containing the Cisco IOS image.
Other options include the following:
•
•
Note

Configuration Register

The virtual configuration register is in nonvolatile RAM (NVRAM) and has the same functionality as
other Cisco voice gateways. You can view or modify the virtual configuration register from either the
ROM monitor or the operating system software. Within the ROM monitor, you can change the
configuration register by entering the register value in hexadecimal format, or by allowing the ROM
monitor to prompt you for the setting of each bit.
Cisco VG202 and Cisco VG204 Voice Gateways Software Configuration Guide
A-4
Commonly Used ROM Monitor Commands (continued)
Description
Lists the main memory information; for example:
rommon 6 > meminfo:
Main memory size: 128 MB.
Available main memory starts at 0x80018000
IO (packet) memory size: 5 percent of main memory
NVRAM size: 128 KB
For more information about the ROM monitor boot commands, see the
Configuration Fundamentals and Network Management
Boots the first image in flash memory.
do not enter a filename, this command will boot this first image in flash memory.
xmodem—Use this if the computer attached to your console has a terminal emulator that has
xmodem capability.
-c—Use cyclic redundancy check (CRC-16).
-y—Use Ymodem transfer protocol.
The Cisco VG202 and Cisco VG204 voice gateways only support -c and -y.
Appendix A Using the ROM Monitor
Cisco IOS
Guide.
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