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Appendix C      ROM Monitor   Command Descriptions
Command Descriptions
Ta b l e C-1 describes the most commonly used ROM monitor commands.
Ta b l e C-1 Commonly Used ROM Monitor Commands 
CommandDescription
help  or ?Displays a summary of all available ROM monitor commands.
-?Displays information about command syntax; for example:
rommon 16 >  dis -?
usage : dis [addr] [length]
The output for this...

 
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Appendix C      ROM Monitor
  Disaster Recovery with TFTP Download
NoteThe commands described in this section are case  sensitive and must be entered exactly as shown.
Required Variables
These variables must be set with these commands before you use the  tftpdnld command:
VariableCommand
IP address of the router.IP_ADDRESS=  ip_address
Subnet mask of the router.IP_SUBNET_MASK=  
ip_address
IP address of...

 
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Appendix C      ROM Monitor
  Disaster Recovery with TFTP Download
Using the TFTP Download Command
Perform these steps in ROM monitor mode to download a file through TFTP.
Step 1Use the appropriate commands to enter all the required variables and any optional variables described in 
preceding sections.
Step 2Enter the tftpdnld command as follows:
rommon 1 > tftpdnld -r 
NoteThe -r variable is optional....

 
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Appendix C      ROM Monitor
  Configuration Register
Configuration Register
The virtual configuration register is in nonvolatile RAM (NVRAM) and has the same functionality as 
other Cisco routers. 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...

 
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Appendix C      ROM Monitor   Console Download
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
Console Download
You can use console download, a ROM monitor function, to download either a software image or a 
configuration file over the router  console port. After...

 
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Appendix C      ROM Monitor
  Debug Commands
Follow these steps to run Xmodem:
Step 1Move the image file to the local drive where Xmodem will execute.
Step 2Enter the xmodem command.
Error Reporting
Because the ROM monitor console download uses the console to perform the data transfer, when an error 
occurs during a data transfer, error messages are only displayed on the console once the data transfer is...

 
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Appendix C      ROM Monitor
  Exiting the ROM Monitor
 sysret—Displays return information from the last booted system image. This information includes 
the reason for terminating the image, a stack dump of up to eight frames, and, if an exception is 
involved, the address where the exception occurred; for example:
rommon 8> sysret
System Return Info:count: 19,  reason: user break
pc:0x801111b0,  error...

 
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Appendix C      ROM Monitor
  Exiting the ROM Monitor 

 
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APPENDIXD
Common Port Assignments
Ta b l e D-1 lists currently assigned Transmission Control Protocol (TCP) port numbers. To the extent 
possible, the User Datagram Protocol (UDP) uses the same numbers.
Ta b l e D-1 Currently Assigned TCP and UDP Port Numbers 
PortKeywordDescription
0—Reserved
1–4—Unassigned
5RJERemote job entry
7ECHOEcho
9DISCARDDiscard
11USERSActive users
13DAYTIMEDaytime...

 
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Appendix D      Common Port Assignments
  
77–Any private RJE service
79FINGERFinger
95SUPDUPSUPDUP Protocol
101HOST NAMENetwork interface card (NIC) 
hostname server
102ISO-TSAPISO-Transport Service Access Point 
(
TSAP)
103X400X400
104X400-SNDX400-SND
111SUNRPCSun Microsystems Remote 
Procedure Call 
113AUT HAuthentication service
117UUCP-PATHUNIX-to-UNIX Copy Protocol 
(UUCP) Path Service
119NNTPUsenet...