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Cisco 4500-M and Cisco 4700 ROM Monitor
This appendix describes the Cisco 4500-M and Cisco 4700 ROM monitor, the first software to run when the router is powered-up or reset. The Cisco 4500-M and Cisco 4700 ROM monitor supports more features than the familiar Cisco 4000-M ROM monitor. The ROM Monitor can help you isolate or rule out hardware problems encountered when installing your router. A summary of the ROM monitor diagnostic tests and command options is provided.
The ROM monitor diagnostics help initialize the processor hardware and boot the main operating system software. If you set the software configuration register (bits 3, 2, 1, and 0) to zero, you can start the router in the standalone ROM monitor. An example of the Cisco 4500-M and Cisco 4700 ROM monitor prompt follows:
rommon 1 >
To enable the Break key, and to default to booting at the ROM monitor while running the system software, reset the configuration register to 0x0 by entering configuration mode, and enter the configuration command following:
The new configuration register value, 0x0, takes effect after the router is rebooted with the reload command. If you set the configuration to 0x0, you will have to manually boot the system from the console each time you reload the router.
At the ROM monitor prompt, enter ? or help at the rommon 1 > prompt to display a list of available commands and options, as follows:
rommon 1 > ? help monitor builtin command help boot boot up an external process dir list files in file system dev list the device table confreg configuration register utility reset system reset stack produce a stack trace context display the context of a loaded image frame print out a selected stack frame sysret print out info from last system return meminfo main memory information rommon 2 >
Following are ROM monitor command conventions:
The following case-sensitive ROM monitor commands are among the most useful:
rommon 10 > dev Devices in device table: id name flash: flash bootflash: boot flash eprom: eprom
rommon 11 > dir flash: File size Checksum File name 2229799 bytes (0x220627) 0x469e C4500-k
Most of the debugging commands are functional only when the Cisco IOS software has crashed or is aborted. If you enter the debug commands and Cisco IOS crash information is not available, the screen will display the following error message:
"xxx: kernel context state is invalid, can not 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: 8 MB. Packet memory size: 4 MB Available main memory starts at 0xa000e001, size 0x7f1fff Packet memory starts at 0xa8000000 NVRAM size: 0x20000
The configuration register resides in NVRAM. The configuration register is identical in operation to other Cisco routers. Enter confreg for the menudriven system, or enter the new value of the register in hexadecimal.
rommon 7 > confreg Configuration Summary enabled are: 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 netboot fails"? y/n [n]: enable "use all zero broadcast"? y/n [n]: enable "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 [0]: 0 change the boot characteristics? y/n [n]: y enter to boot: 0 = ROM Monitor 1 = the boot helper image 2-15 = boot system [0]: 0 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
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