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Cisco Router 860, 880 Series User Manual

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Appendix B      Concepts
  Access Lists
Access Lists
With basic standard and static extended access lists, you can approximate session filtering by using the 
established keyword with the permit command. The established keyword filters TCP packets based on 
whether the ACK or RST bits are set. (Set ACK or RST bits indicate that the packet is not the first in the 
session and the packet therefore belongs to an established session.) This filter criterion would be part of 
an...

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Appendix B      Concepts
  Access Lists 

Page 323

 
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APPENDIXC
ROM Monitor
The ROM monitor firmware runs when the router is powered up or reset. The firmware helps to initialize 
the processor hardware and boot the operating system software. You can use the ROM monitor to 
perform certain configuration tasks, such as recovering a lost password or downloading software over 
the console port. If there is no Cisco
 IOS software image loaded on the router, the ROM monitor runs 
the router.
This appendix contains the following...

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Appendix C      ROM Monitor
  ROM Monitor Commands
TimesaverBreak (system interrupt) is always enabled for 60 seconds after the router reboots, regardless of whether 
it is set to 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. 
ROM Monitor Commands
Enter ? or help at the ROM monitor prompt to display a list of available commands and options, as 
follows:
rommon 1 > ?alias set and...

Page 325

 
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Appendix C      ROM Monitor
  Command Descriptions
Commands are case sensitive. You can halt any command by pressing the Break key on a terminal. If 
you are using a PC, most terminal emulation programs halt a command when you press the Ctrl and the 
Break keys at the same time. If you are using another type of terminal emulator or terminal emulation 
software, see the documentation for that product for information on how to send a Break command. 
Command Descriptions
Ta b l...

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Appendix C      ROM Monitor
  Disaster Recovery with TFTP Download
TFTP Download Command Variables
This section describes the system variables that can be set in ROM monitor mode and that are used 
during the TFTP download process. There are both required variables and optional variables. 
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...

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Appendix C      ROM Monitor
  Disaster Recovery with TFTP Download
Optional Variables
These variables can be set with these commands before using the tftpdnld command:
Using the TFTP Download Command
To download a file through TFTP perform these steps in ROM monitor mode 
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...

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Appendix C      ROM Monitor
  Configuration Register
You will see output similar to the following:
IP_ADDRESS: 10.3.6.7
IP_SUBNET_MASK: 255.255.0.0DEFAULT_GATEWAY: 10.3.0.1
TFTP_SERVER: 192.168.254.254
TFTP_FILE: c880-advsecurityk9-mzDo you wish to continue? y/n:  [n]:
Step 3If you are sure that you want to continue, enter y in response to the question in the output:
Do you wish to continue? y/n:  [n]:y
The router begins to download the new file.
If you mistakenly entered...

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Appendix C      ROM Monitor
  Console Download
The following display shows an example of entering the confreg command:
rommon 7> confreg
      Configuration Summary
enabled are:
console baud: 9600boot: the ROM Monitor
 
do you wish to change the configuration? y/n  [n]:  yenable  “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...

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Appendix C      ROM Monitor
  Debug Commands
Command Description
The following are the syntax and descriptions for the xmodem console download command:
xmodem [-cyrx] destination_file_name
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,...
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