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ROM monitor is the firmware that runs when the Cisco Optical Networking System (ONS) 15303 is powered up or reset. The ROM monitor can help you isolate or rule out hardware problems encountered when installing the Cisco ONS 15303.
This appendix contains the following sections:
In normal operation, the ROM monitor helps initialize the processor hardware and boot the operating system software. To use the ROM monitor, you must have console port access.
From the operating system software, you can configure the Cisco ONS 15303 to remain in the ROM monitor the next time it boots by setting virtual configuration register bits 3, 2, 1, and 0 to zero. From the console, enter the following configuration command:
configuration-register 0x0
The new configuration register value, 0x0, is effective after the Cisco ONS 15303 is rebooted with the reload command. The Cisco ONS 15303 remains in the ROM monitor and does not boot the operating system.
If the configuration value remains 0x0, you must manually boot the operating system from the console. Refer to the boot command in the "Command Descriptions" section .
Break (system interrupt) is always enabled for 60 seconds after the Cisco ONS 15303 reboots, regardless of whether it is configured on or off in the configuration register. During this 60-second window, you can break to the ROM monitor prompt by pressing the Break key.
The ROM monitor prompt is as follows:
rommon 1 >
In this example, 1 (the number one) is the line number and is incremented at each prompt.
Enter help at the ROM monitor prompt to display a list of available commands and options. Table A-1 lists the ROM monitor commands.
| Command | Purpose |
|---|---|
alias | Set and display aliases command |
arp | Dump ARP table |
boot | Boot up an external process |
confreg | Configuration register utility |
context | Display the context of a loaded image |
copy | Similar to the UNIX copy command, and allows Flash file copy |
dir | List files in file system |
frame | Print out a selected stack frame |
help | Monitor built-in command help |
history | Monitor command history |
meminfo | Main memory information |
ping | Ping utility |
repeat | Repeat a monitor command |
reset | System reset |
| Set real-time clock |
| Display the monitor variables |
| Produce a stack trace |
| Write monitor environment to NVRAM |
| Print out information from last system return |
| Configure TFTP-filename and/or MAC, IP, host-IP address |
| TFTP download protocol |
| Unset an alias |
| Unset a monitor variable |
To display information about command syntax, enter the command name followed by the -? option. Commands are case sensitive. You can cancel any command by pressing the Break key at the console.
The following ROM monitor commands are among the most useful:
Options to the boot command are -x, load image but do not execute, and -v, verbose.
The Cisco ONS 15303 commands show version and show hardware will display the source of the currently running image:
rommon 11 > dir flash:
File size Checksum File name
2229799 bytes (0x220627) 0x469e C3600-j-m2
Most debugging commands are functional only when Cisco ONS 15303 software has crashed or is aborted. If you enter a debugging command and Cisco ONS 15303 crash information is not available, the following error message displays:
"xxx: kernel context state is invalid, cannot proceed."
rommon 8 > sysret System Return Info: count: 19, reason: user break pc:0x60043754, error address: 0x0 Stack Trace: FP: 0x80007e78, PC: 0x60043754 FP: 0x80007ed8, PC: 0x6001540c FP: 0x80007ef8, PC: 0x600087f0 FP: 0x80007f18, PC: 0x80008734
rommon 9 > meminfo Main memory size: 16 MB in 64-bit mode. Available main memory starts at 0xa000e000, size 16328KB IO (packet) memory size: 25 percent of main memory. NVRAM size: 128KB
The virtual configuration register resides in NVRAM and is identical in operation to other Cisco ONS 15303s. You can view or modify the virtual configuration register from either the ROM monitor or the operating system software.
To change the virtual configuration register from the ROM monitor, enter confreg by itself for menu mode, or enter the new value of the register in hexadecimal.
In either case, the new virtual configuration register value is written into NVRAM, but is not effective until you reset or power-cycle the Cisco ONS 15303.
The following display shows an example of menu mode:
rommon 7 > confreg
Configuration Summary
enabled are:
break/abort has effect
console baud: 9600
boot: the ROM Monitor
do you wish to change the configuration? y/n [n]: y
enable "diagnostic mode"? y/n [n]: y
enable "use net in IP bcast address"? y/n [n]:
enable "load rom after IOSboot fails"? y/n [n]:
enable "use all zero broadcast"? y/n [n]:
disable "break/abort has effect"? y/n [n]:
enable "ignore system config info"? y/n [n]:
change console baud rate? y/n [n]: y
enter rate: 0 = 9600, 1 = 4800, 2 = 1200, 3 = 2400
4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200 [0]:0
change the boot characteristics? y/n [n]: y
enter to boot:
0 = ROM Monitor
1 = default boot image - "flash:/c3303-i4-mz"
2 = user specified image #1 - "flash:/c3303-i4-mz"
3 = user specified image #2 - "flash:/c3303-i4-mz"
Configuration Summary
enabled are:
diagnostic mode
console baud: 9600
boot: the ROM Monitor
do you wish to change the configuration? y/n [n]:
You must reset or power cycle for new config to take effect
If your Cisco ONS 15303 experiences difficulties and no longer contains a valid software image in Flash memory, you can recover the image using the following ROM monitor commands:
Use the tconf command to configure the settings for the TFTP file. This command and these options apply only to the ROM monitor. Command options include the following:
Use the tftp command to download Cisco IOS images. Command options include the following:
Posted: Fri Apr 7 10:25:26 PDT 2000
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