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C-5
Cisco Secure Router 520 Series Software Configuration Guide
OL-14210-01
Appendix C ROM Monitor
Configuration Register
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
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: sr520-adipservicessk9-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.
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=settin
g