Cisco Systems VG224 manual Recovering Boot and System Images, Using the xmodem Command

Appendix C Using the ROM Monitor

Entering the ROM Monitor Mode

System Bootstrap, Version 12.3(4)T, RELEASE SOFTWARE (fc1) TAC Support: http:_//www.cisco.com/tac

Copyright (c) 2002 by cisco Systems, Inc.

cvg224 processor with 196608 Kbytes of main memory

Main memory is configured to 64 bit mode with parity disabled

Upgrade ROMMON initialized rommon 1 >

Following output example a configuration that has been saved:

Router# upgrade rom-monitor file tftp://223.225.254.254/ajayhn/cvg224_BM2.SREC

Loading ajayhn/Cvg224_RM2.srec from 223.255.254.254 (via FastEthernet0/0):

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[OK - 641719/1283072 bytes]

This command will reload the router. Continue? [yes/no]: y Erasing boot flash eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee Programming boot flash pppp

Now Reloading

System Bootstrap, Version 12.3(4)T, RELEASE SOFTWARE (fc1) TAC Support: http://www.cisco.com/tac

Copyright (c) 2001 by cisco Systems, Inc. Running new upgrade for first time

System Bootstrap, Version 12.3(4)T, RELEASE SOFTWARE (fc1) TAC Support: http://www.cisco.com/tac

Copyright (c) 2002 by cisco Systems, Inc.

cvg224 processor with 196608 Kbytes of main memory

Main memory is configured to 64 bit mode with parity disabled

Upgrade ROMMON initialized rommon 1 >

Note The rommon-prefin ROMMON mode provides the same information as upgrade rom-monitor preference command in the Cisco IOS EXEC mode.

Recovering Boot and System Images

If your router 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:

•xmodem—Use this command if the computer attached to your console has a terminal emulator that has xmodem capability.

•tftpdnld—Use this command if you have a TFTP server directly connected to a Fast Ethernet port.

Using the xmodem Command

The xmodem command establishes a connection between a console and the router 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 router. The optional parameter filename specifies the source file containing the Cisco IOS image.

Other options include the following:

•-c—Uses cyclic redundancy check (CRC-16)

•-y—Uses Ymodem transfer protocol

Cisco VG224 Voice Gateway Software Configuration Guide

C-8 OL-5005-01