Chapter 5 Troubleshooting
Upgrading the Boot Helper (Boot Loader) Image
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.
Note The Cisco 7401ASR router requires the
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.
Step 2 Reformat the Flash memory on your router as follows:
router# format bootflash:
Format operation may take a while. Continue? [confirm]
Format operation will destroy all data in "bootflash:". Continue? [confirm]
Formatting sector ...
Format of bootflash:complete
Note Reformatting Flash memory erases the current Flash memory contents.
Step 3 Copy the boot helper image from the TFTP server to Flash memory as follows:
router# copy tftp bootflash:
Address or name of remote host []? biff
Source filename []?
Destination filename
Accessing
Loading
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.
Cisco 7401ASR Installation and Configuration Guide
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