Specifications
Table Of Contents
- Software Configuration Guide
- Contents
- Preface
- Understanding Interface Numbering and Cisco IOS Software Basics
- Understanding Interface Numbering
- Understanding Cisco IOS Software Basics
- Upgrading to a New Cisco IOS Release
- Where to Go Next
- Using the Setup Command Facility
- Before Starting Your Router
- Using the setup Command Facility
- Configuring Global Parameters
- Configuring Interface Parameters
- Completing the Configuration
- Where to Go Next
- Configuring with the Command-Line Interface
- Configuring the Host Name and Password
- Configuring 1-Port and 2-Port Ethernet Interfaces
- Configuring Fast Ethernet Interfaces
- Configuring Asynchronous/Synchronous Serial Network Modules or WAN Interface Cards
- Configuring 16-Port and 32-Port Asynchronous Network Modules
- Configuring ISDN BRI WAN Interface Cards
- Configuring T1 and E1 Interfaces
- Configuring T1 (FT1) WAN Interface Cards
- Configuring ATM Interfaces
- Configuring Inverse Multiplexing for ATM Interfaces
- Configuring Analog Modem Interfaces
- Configuring Wireless Multipoint Interfaces
- Checking the Interface Configuration
- Configuring 1-Port ADSL WAN Interface Card
- Configuring the NM-AIC-64, Contact Closure Network Module
- Configuring the 1-Port HSSI Network Module
- Configuring the Compression Network Module for the Cisco 3600 Series Routers
- Configuring the Digital Modem Network Module for the Cisco 3640 Router
- Prerequisites
- Configuration Tasks
- Configure the E1/T1 Network Module for ISDN PRI
- Configure the ISDN D-Channel Serial Interfaces
- Configure the Loopback Interface
- Configure the LAN Interface
- Create the Group Asynchronous Interface
- Configure the ISDN Dialer Interface
- Configure the Default IP Pool Information
- Configure Modem Lines for Dial-In and Dial-Out
- Configuration Example
- Configuring 1-Port G.SHDSL WAN Interface Card
- Saving Configuration Changes
- Where to Go Next
- Configuring Voice-over-IP
- Voice-over-IP Prerequisites
- Configuring the Voice Interface
- Voice-over-IP Configuration Examples
- Where to Go Next
- Configuration Examples
- Cisco 2600 Series Router Configuration Example
- Cisco 3631 Router Configuration Example
- Cisco 3725 Router Configuration Example
- 1-Port ADSL WAN Interface Card Configuration Examples
- NM-AIC-64, Contact Closure NetworkConfiguration Examples
- Cisco 3640 Central Site Configuration to Support ISDN and Modem Calls
- Formatting the Compact Flash Memory Cards
- Using the ROM Monitor
- Index
C-5
Software Configuration Guide for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
OL-1957-03
Appendix C Using the ROM Monitor
Entering the ROM Monitor Mode
Debugging Commands
Most debugging commands are functional only when Cisco IOS software has crashed or is aborted. If
you enter a debugging command and Cisco IOS crash information is not available, the following error
message displays:
“xxx: kernel context state is invalid, can not proceed.”
• stack or k—Produce a stack trace.
• context—Display processor context.
• frame—Display an individual stack frame.
• sysret—Display 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: a SegV exception
pc:0x802b1040, error address: 0x802b1040
Stack Trace:
FP: 0x80908398, PC: 0x802b102c
FP: 0x809083b0, PC: 0x802b0b88
FP: 0x809083d8, PC: 0x8017039c
FP: 0x809083e8, PC: 0x8016f764
Configuration Register Commands
The virtual configuration register resides in NVRAM. You can display or modify the virtual
configuration register from either the ROM monitor or the operating system software.
To change the virtual configuration register from the ROM monitor, enter confreg by itself for menu
mode, or enter the new value of the register in hexadecimal.
• confreg [hexnum]—Change the virtual configuration register to the value specified. The value is
always interpreted as hexadecimal.
Note Entering confreg without an argument displays the contents of the virtual configuration register and
prompts you to alter the contents by describing the meaning of each bit. In either case, the new virtual
configuration register value is written into NVRAM, but is not effective until you reset or
power-cycle the router.
The following display shows an example of the confreg command:
rommon 7 > confreg
Configuration Summary
enabled are:
break/abort has effect
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]:
disable “break/abort has effect”? y/n [n]: