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Appendix B      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
The steps described in this section should be performed while in ROM monitor mode.
Step 1Use the appropriate commands to enter all the required variables and any optional...

  
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Appendix B      ROM Monitor
Configuration Register
You will see output similar to the following:
IP_ADDRESS: 1.3.6.7
      IP_SUBNET_MASK: 255.255.0.0
     DEFAULT_GATEWAY: 1.3.0.1
         TFTP_SERVER: 223.255.254.254
           TFTP_FILE: c806-sy-mz
Invoke this command for disaster recovery only.
WARNING: all existing data in all partitions on flash will be lost!
Do...

  
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Appendix B      ROM Monitor
Console Download
The following display shows an example of entering the confreg command:
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...

  
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Appendix B      ROM Monitor
Console Download
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 the Xmodem will execute.
Step 2Enter the xmodem command.
Error Reporting
Because the ROM monitor...

  
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Appendix B      ROM Monitor
Debug Commands
Debug Commands
Most ROM monitor debugging commands are functional only when Cisco IOS software has crashed or 
is halted. If you enter a debugging command and Cisco IOS crash information is not available, you see 
the following error message:
xxx: kernel context state is invalid, can not proceed.
The following are ROM monitor...

  
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Appendix B      ROM Monitor
Exiting the ROM Monitor
IO (packet) memory size: 5 percent of main memory.
NVRAM size: 32KB
Exiting the ROM Monitor
You must set the configuration register to a value from 0x2 to 0xF for the router to boot a Cisco IOS 
image from Flash memory upon startup or reloading. 
The following example shows how to reset the configuration register and...

  
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APPENDIXC
Common Port Assignments
Ta b l e C - 1 lists currently assigned Transmission Control Protocol (TCP) port numbers. To the extent 
possible, the User Datagram Protocol (UDP) uses the same numbers.
Table C-1 Currently Assigned TCP and UDP Port Numbers
Port Keyword Description
0–Reserved
1–4–Unassigned
5 RJE Remote job entry
7ECHO Echo
9 DISCARD Discard
11 USERS...

  
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Appendix C      Common Port Assignments
77–Any private RJE service
79 FINGER Finger
95 SUPDUP SUPDUP Protocol
101 HOST NAME NIC host name server
102 ISO-TSAP ISO-Transport Service Access Point
 
(
TSAP)
103 X400 X400
104 X400-SND X400-SND
111 SUNRPC SUN Remote Procedure Call 
113 AUTH Authentication Service
117 UUCP-PATH UNIX-to-UNIX Copy Protocol 
(UUCP) Path Service...

  
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INDEX
Symbols
-? commandB-3
? commandA-4, B-3
A
AAL1-7
AAL3/41-7
AAL51-7
AAL5MUXPPP encapsulation configuration example3-8
AAL5SNAP encapsulation configuration example3-7, 
3-10
abbreviating commandsA-6
access lists1-13, 3-23 to 3-24
ACK bits1-13
addressing, configuring3-15 to 3-22
Address Resolution Protocol
See ARP
ADSL
benefits of
2-3, 2-5
network connections...

  
Index
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C
call1-11
call leg, defining a1-11
CAR1-12
caution, describedxii
CBWFQ1-12
CD-ROM, documentationxiv
Central RADIUS Server, configuring2-43
CHAP1-5, 1-6
Cisco 831 router VPN connections2-3
Cisco documentationxiv
Cisco IOS
queues
1-13
class-based weighted fair queuing
See CBWFQ
command(s)
copy running-config startup-config
A-7
debug atm errors5-8
debug atm...