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Cisco Router 800 Series Software Configuration Guide

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Appendix B      ROM Monitor
Debug Commands
context—displays processor context; for example:
rommon 7> context
CPU context of the most recent exception:
PC  = 0x801111b0  MSR = 0x00009032  CR  = 0x53000035  LR    = 
0x80113694
CTR = 0x801065e4  XER = 0xa0006d36  DAR = 0xffffffff  DSISR = 
0xffffffff
DEC = 0xffffffff  TBU = 0xffffffff  TBL = 0xffffffff  IMMR  = 
0xffffffff
R0  = 0x00000000  R1  = 0x80005ea8  R2  = 0xffffffff  R3    =...

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Appendix B      ROM Monitor
Disaster Recovery with Console Download of Cisco IOS Software
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meminfo—displays size in bytes, starting address, available range of main 
memory, the starting point and size of packet memory, and size of NVRAM; 
for example:
rommon 9> meminfo
Main memory size: 40 MB.
Available main memory starts at 0x10000, size 40896KB
IO (packet) memory size: 5 percent of main memory.
NVRAM size: 32KB
Disaster Recovery...

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Appendix B      ROM Monitor
Disaster Recovery with Console Download of Cisco IOS Software
Follow the steps below to run Xmodem:
1.Move the image file to the local drive where the Xmodem will execute. 
2.Enter the xmodem command.
Error Reporting
Because the ROM monitor console download uses the console to perform the data 
transfer, error messages are displayed on the console only when the data transfer 
is terminated. 
If an error...

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Appendix B      ROM Monitor
Disaster Recovery with Console Download of Cisco IOS Software
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Debug Commands
Most ROM monitor debugging commands are functional only when the 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, cannot proceed.”
The following are ROM monitor debugging...

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Appendix B      ROM Monitor
Disaster Recovery with Console Download of Cisco IOS Software
R28 = 0xffffffff R29 = 0xffffffff R30 = 0xffffffff R31 =
0xffffffff
frame—displays an individual stack frame.
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...

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Appendix B      ROM Monitor
Disaster Recovery with Console Download of Cisco IOS Software
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78-5372-06 You must reset or power cycle for new config to take effect
rommon 2 >boot
The router will boot the Cisco IOS image in Flash memory. The configuration 
register will change to 0x2101 the next time the router is reset or power cycled. 

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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 Active users
13 DAYTIME Daytime
15 NETSTAT Who is up or NETSTAT
17 QUOTE...

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Appendix C      Common Port Assignments
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37 TIME Time
39 RLP Resource Location Protocol
42 NAMESERVER Host Name Server
43 NICNAME Who is
49 LOGIN Login Host Protocol 
53 DOMAIN Domain Name Server
67 BOOTPS Bootstrap Protocol Server
68 BOOTPC Bootstrap Protocol Client
69 TFTP Trivial File Transfer Protocol
75–Any private dial-out service
77–Any private RJE service
79 FINGER Finger
95 SUPDUP SUPDUP Protocol
101 HOST NAME NIC host name server
102...

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Appendix C      Common Port Assignments
138 NETBIOS-DGM NETBIOS datagram service
139 NETBIOS-SSN NETBIOS session service
161 SNMP Simple Network Management 
Protocol
162 SNMP-TRAP Simple Network Management 
Protocol traps
512 rexec UNIX rexec (control)
513 TCP—rlogin
UDP—rwhoTCP—UNIX rlogin
UDP—UNIX broadcast name 
service
514 TCP—rsh
UDP—syslogTCP—UNIX rsh and log
515 Printer UNIX line printer remote spooling
520 RIP Routing Information...

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