Cisco CISCO876-SEC-I-K9 Configuration Guide - Page 184

Command Description, Error Reporting, Debug Commands

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Debug Commands Appendix C ROM Monitor Command Description The following are the syntax and descriptions for the xmodem console download command: xmodem [-cyrx] destination_file_name c Optional. Performs the download using 16-bit cyclic redundancy check (CRC-16) error checking to validate packets. Default is 8-bit CRC. y Optional. Sets the router to perform the download using Ymodem protocol. The default is Xmodem protocol. The protocols differ as follows: • Xmodem supports a 128-block transfer size. Ymodem supports a 1024-block transfer size. • Ymodem uses CRC-16 error checking to validate each packet. Depending on the device that the software is being downloaded from, this function might not be supported by Xmodem. r Optional. Image is loaded into DRAM for execution. The default is to load the image into flash memory. x Optional. Image is loaded into DRAM without being executed. destination_ Name of the system image file or the system configuration file. In order for the router file_name to recognize it, the name of the configuration file must be router_confg. Follow these steps to run Xmodem: Step 1 Step 2 Move the image file to the local drive where Xmodem will execute. Enter 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 terminated. If you have changed the baud rate from the default rate, the error message is followed by a message telling you to restore the terminal to the baud rate specified in the configuration register. 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." Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide C-8 OL-5332-01

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C-8
Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide
OL-5332-01
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
c
Optional. Performs the download using 16-bit cyclic redundancy check (CRC-16) error
checking to validate packets. Default is 8-bit CRC.
y
Optional. Sets the router to perform the download using Ymodem protocol. The default
is Xmodem protocol. The protocols differ as follows:
•
Xmodem supports a 128-block transfer size. Ymodem supports a 1024-block
transfer size.
•
Ymodem uses CRC-16 error checking to validate each packet. Depending on the
device that the software is being downloaded from, this function might not be
supported by Xmodem.
r
Optional. Image is loaded into DRAM for execution. The default is to load the image
into flash memory.
x
Optional. Image is loaded into DRAM without being executed.
destination_
file_name
Name of the system image file or the system configuration file. In order for the router
to recognize it, the name of the configuration file must be
router_confg
.
Follow these steps to run Xmodem:
Step 1
Move the image file to the local drive where Xmodem will execute.
Step 2
Enter 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
terminated.
If you have changed the baud rate from the default rate, the error message is followed by a message
telling you to restore the terminal to the baud rate specified in the configuration register.
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."