Upgrading The Boot Helper (Boot Loader) Image - Cisco 7401ASR Installation And Configuration Manual

Chapter 5 Troubleshooting

Upgrading the Boot Helper (Boot Loader) Image

The boot helper (boot loader) image resides in Flash memory and contains a subset of the Cisco IOS
software. This image is used to boot your router from the network or to load Cisco IOS images onto the
router. This image is also used if the system cannot find a valid system image.
Your boot helper (boot loader) image should correspond to the Cisco IOS release that is running on your
router.
The Cisco 7401ASR router requires the c7400-kboot-mz boot helper image.
Note
To upgrade your boot helper (boot loader) image, obtain the most current boot helper image through
Cisco.com and copy the new boot helper image to Flash memory on your router. For information on how
to access Cisco.com, see the "Cisco.com" section in the Preface. Follow the Software Center link under
Service and Support. You need to get a login code from a Cisco representative to retrieve files from the
Software Center.
To obtain a boot helper (boot loader) image from Cisco.com and upgrade your bootflash, do the
following:
Step 1 Download the boot helper (boot loader) image from Cisco.com to a Trivial File Transfer Protocol
(TFTP) server.
Reformat the Flash memory on your router as follows:
Step 2
router# format bootflash:
Format operation may take a while. Continue? [confirm]
Format operation will destroy all data in "bootflash:".
Formatting sector ...
Format of bootflash:complete
Note
Copy the boot helper image from the TFTP server to Flash memory as follows:
Step 3
router# copy tftp bootflash:
Address or name of remote host []? biff
Source filename []? c7200-boot-mz.120-5.S
Destination filename [c7200-boot-mz.120-5.S]?
Accessing tftp://biff/c7200-boot-mz.120-5.S...
Loading c7200-boot-mz.120-5.S from 192.168.254.254 (via
Ethernet4/0):!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 3132516/6264832 bytes]
3132516 bytes copied in 28.488 secs (111875 bytes/sec)
This completes the procedure for upgrading your boot helper (boot loader) image. For more detailed
instructions on loading and maintaining system images and microcode, including boot helper images,
refer to the Cisco IOS Configuration Fundamentals Configuration Guide, which is available on
Cisco.com.
OL-5419-01 B0
Reformatting Flash memory erases the current Flash memory contents.
Upgrading the Boot Helper (Boot Loader) Image
Continue? [confirm]
Cisco 7401ASR Installation and Configuration Guide
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