Cisco 870-Series Router Manual PDF (Setup & Configuration Guide)

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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:

Variable

Command

Configures how the router displays file

download progress.

0—No progress is displayed.

1—Exclamation points (!!!) are displayed to

indicate file download progress. This is the

default setting.

2—Detailed progress is displayed during the

file download process; for example:

•

Initializing interface.

•

Interface link state up.

•

ARPing for 1.4.0.1

•

ARP reply for 1.4.0.1 received.

MAC

address 00:00:0c:07:ac:01

TFTP_VERBOSE=

setting

Number of times the router attempts ARP and

TFTP download. The default is 7.

TFTP_RETRY_COUNT=

retry_times

Length of time, in seconds, before the download

process times out. The default is

2,400 seconds (40 minutes).

TFTP_TIMEOUT=

time

Whether or not the router performs a checksum

test on the downloaded image:

1—Checksum test is performed.

0—No checksum test is performed.

TFTP_CHECKSUM=

setting

Using the TFTP Download Command

Perform these steps in ROM monitor mode to download a file through TFTP.

Step 1

Use the appropriate commands to enter all the required variables and any optional variables described in

preceding sections.

Step 2

Enter the

tftpdnld

command as follows:

rommon 1 >

tftpdnld -r

Note

The

-r

variable is optional. Entering this variable downloads and boots the new software but does

not save the software to flash memory. You can then use the image that is in flash memory the

next time you enter the

reload

command.

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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: 255.255.0.0

DEFAULT_GATEWAY: 10.3.0.1

TFTP_SERVER: 192.168.254.254

TFTP_FILE: c870-advsecurityk9-mz

Do you wish to continue? y/n:

[n]:

Step 3

If 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 yes, you can enter

Ctrl-C

or

Break

to stop the transfer before the flash

memory is erased.

Configuration Register

The virtual configuration register is in nonvolatile RAM (NVRAM) and has the same functionality as

other Cisco routers. You can view or modify the virtual configuration register from either the ROM

monitor or the operating system software. Within the ROM monitor, you can change the configuration

register by entering the register value in hexadecimal format, or by allowing the ROM monitor to prompt

you for the setting of each bit.

Changing the Configuration Register Manually

To change the virtual configuration register from the ROM monitor manually, enter the

confreg

command followed by the new value of the register in hexadecimal format, as shown in the following

example:

rommon 1 >

confreg 0x2101

You must reset or power cycle for new config to take effect

rommon 2 >

The value is always interpreted as hexadecimal. The new virtual configuration register value is written

into NVRAM but does not take effect until you reset or reboot the router.

Changing the Configuration Register Using Prompts

Entering the

confreg

command without an argument displays the contents of the virtual configuration

register and a prompt 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 does not take

effect until you reset or reboot the router.

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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: 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]:

enable

“break/abort has effect”? y/n

[n]:

enable

“ignore system config info”? y/n

[n]:

change console baud rate? y/n

[n]:

y

enter rate: 0 = 9600, 1 = 4800, 2 = 1200, 3 = 2400

[0]:

0

change the boot characteristics? y/n

[n]:

y

enter to boot:

0 = ROM Monitor

1 = the boot helper image

2-15 = boot system

[0]:

0

Configuration Summary

enabled are:

diagnostic mode

console baud: 9600

boot: the ROM Monitor

do you wish to change the configuration? y/n

[n]:

You must reset or power cycle for new config to take effect

Console Download

You can use console download, a ROM monitor function, to download either a software image or a

configuration file over the router console port. After download, the file is either saved to the mini-flash

memory module or to main memory for execution (image files only).

Use console download when you do not have access to a TFTP server.

Note

If you want to download a software image or a configuration file to the router over the console port, you

must use the ROM monitor

dnld

command.

Note

If you are using a PC to download a Cisco IOS image over the router console port at 115,200 bps, ensure

that the PC serial port is using a 16550 universal asynchronous transmitter/receiver (UART). If the PC

serial port is not using a 16550 UART, we recommend using a speed of 38,400 bps or less when

downloading a Cisco IOS image over the console port.

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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

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."

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Appendix C

ROM Monitor

Debug Commands

The following are ROM monitor debugging commands:

•

stack

or

k

—Produces a stack trace; for example:

rommon 6>

stack

Stack trace:

PC = 0x801111b0

Frame 00: FP = 0x80005ea8

PC = 0x801111b0

Frame 01: FP = 0x80005eb4

PC = 0x80113694

Frame 02: FP = 0x80005f74

PC = 0x8010eb44

Frame 03: FP = 0x80005f9c

PC = 0x80008118

Frame 04: FP = 0x80005fac

PC = 0x80008064

Frame 05: FP = 0x80005fc4

PC = 0xfff03d70

•

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

= 0x00000000

R4

= 0x8fab0d76

R5

= 0x80657d00

R6

= 0x80570000

R7

= 0x80570000

R8

= 0x00000000

R9

= 0x80570000

R10 = 0x0000954c

R11

= 0x00000000

R12 = 0x00000080

R13 = 0xffffffff

R14 = 0xffffffff

R15

= 0xffffffff

R16 = 0xffffffff

R17 = 0xffffffff

R18 = 0xffffffff

R19

= 0xffffffff

R20 = 0xffffffff

R21 = 0xffffffff

R22 = 0xffffffff

R23

= 0xffffffff

R24 = 0xffffffff

R25 = 0xffffffff

R26 = 0xffffffff

R27

= 0xffffffff

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 exception occurred; for example:

rommon 8>

sysret

System Return Info:

count: 19,

reason: user break

pc:0x801111b0,

error address: 0x801111b0

Stack Trace:

FP: 0x80005ea8, PC: 0x801111b0

FP: 0x80005eb4, PC: 0x80113694

FP: 0x80005f74, PC: 0x8010eb44

FP: 0x80005f9c, PC: 0x80008118

FP: 0x80005fac, PC: 0x80008064

FP: 0x80005fc4, PC: 0xfff03d70

FP: 0x80005ffc, PC: 0x00000000

FP: 0x00000000, PC: 0x00000000

•

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

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