Cisco 2610 Hardware Installation Guide - Page 84

ROM Monitor Command Descriptions, Router Management Commands, Boot Commands in the ROM Monitor

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ROM Monitor Command Descriptions Appendix B Using the ROM Monitor ROM Monitor Command Descriptions Router Management Commands This section lists some useful ROM monitor commands. Refer to the Cisco IOS configuration guides and command references for more information on ROM monitor commands. Boot Commands in the ROM Monitor Functions of Boot Commands The router always boots first from a Cisco IOS image in flash memory, because there is no separate, dedicated boothelper image ([rx]boot). The first image in flash memory functions as the boothelper image, but you can override this by setting the BOOTLDR Monitor environment variable to point to another image. If the ROM monitor does not recognize a device ID specified in the boot command (device does not exist, or command entered incorrectly), the router boots from the first image in flash memory. To boot a router from a Cisco IOS image on a TFTP server (netboot), the installed DRAM must be adequate to hold two uncompressed Cisco IOS images: the image from flash memory and the image downloaded from the TFTP server. If the router is configured to boot from a TFTP server (boot bits in the configuration register are set from 2 to 15), the router first boots from the image in flash memory. It decompresses that image in DRAM, parses the boot system commands, downloads the Cisco IOS image from the TFTP server, and decompresses it in DRAM. After the Cisco IOS image from the TFTP server is in DRAM, the DRAM memory occupied by the boothelper image is released. Note Booting from a TFTP server is useful if the router does not have enough flash memory to hold large images. With a small image in flash memory (just large enough to support the necessary interfaces), the router boots from flash memory, and then the larger image is downloaded from the TFTP server. Entering Boot Commands The boot command syntax is as follows, where: • partition is a partition number in the flash memory. • filename is the Cisco IOS image filename. • tftpserver is the IP address of the TFTP server. • -x directs the router to load the image but not execute the boot process. • -v (verbose) specifies that progress print setting messages and error information be displayed. boot [flash: [partition: [filename]] | slot0: [partition: [filename]] | slot1: [partition: [filename]] | filename tftpserver] [-x] [-v] Some examples of boot commands are as follows: Note In all boot commands, boot can be entered as b. Cisco 2600 Series Routers Hardware Installation Guide B-4 OL-2171-06

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B-4
Cisco 2600 Series Routers Hardware Installation Guide
OL-2171-06
Appendix B
Using the ROM Monitor
ROM Monitor Command Descriptions
ROM Monitor Command Descriptions
Router Management Commands
This section lists some useful ROM monitor commands. Refer to the Cisco
IOS configuration guides and
command references for more information on ROM monitor commands.
Boot Commands in the ROM Monitor
Functions of Boot Commands
The router always boots first from a Cisco IOS image in flash memory, because there is no separate,
dedicated boothelper image ([rx]boot). The first image in flash memory functions as the boothelper
image, but you can override this by setting the BOOTLDR Monitor environment variable to point to
another image. If the ROM monitor does not recognize a device ID specified in the
boot
command
(device does not exist, or command entered incorrectly), the router boots from the first image in flash
memory.
To boot a router from a Cisco IOS image on a TFTP server (netboot), the installed DRAM must be
adequate to hold two uncompressed Cisco IOS images: the image from flash memory and the image
downloaded from the TFTP server.
If the router is configured to boot from a TFTP server (boot bits in the configuration register are set from
2 to 15), the router first boots from the image in flash memory. It decompresses that image in DRAM,
parses the boot system commands, downloads the Cisco IOS image from the TFTP server, and
decompresses it in DRAM. After the Cisco IOS image from the TFTP server is in DRAM, the DRAM
memory occupied by the boothelper image is released.
Note
Booting from a TFTP server is useful if the router does not have enough flash memory to hold large
images. With a small image in flash memory (just large enough to support the necessary interfaces), the
router boots from flash memory, and then the larger image is downloaded from the TFTP server.
Entering Boot Commands
The
boot
command syntax is as follows, where:
•
partition
is a partition number in the flash memory.
•
filename
is the Cisco IOS image filename.
•
tftpserver
is the IP address of the TFTP server.
•
-x
directs the router to load the image but not execute the boot process.
•
-v
(verbose) specifies that progress print setting messages and error information be displayed.
boot
[
flash:
[
partition
:
[
filename
]] |
slot0:
[
partition
:
[
filename
]] |
slot1:
[
partition
:
[
filename
]] |
filename
tftpserver
] [
-x
] [
-v
]
Some examples of
boot
commands are as follows:
Note
In all
boot
commands,
boot
can be entered as
b
.