Upgrading The Boot File Through Command Lines; Disabling Boot Rom Access - 3Com 4500G Family Configuration Manual

2) Upgrading the Boot ROM Program Through Command Lines.
3) Reboot the device to make the specified Boot ROM program take effect.
Follow these steps to upgrade the Boot ROM program:
To do...
Enter system view
Enable the validity check
function when upgrading the
Boot ROM
Return to user view
upgrade the Boot ROM
program on devices

Upgrading the Boot File Through Command Lines

Follow the steps to upgrade the boot file:
1) Save the boot file to the root directory of the device's storage medium using FTP, TFTP, or other
approaches.
2) Use a command to specify the boot file for the next boot of the device.
3) Reboot the device to make the boot file take effect.
Follow the step below to upgrade the boot file:
To do...
Specify a boot file for the next
boot
When multiple Boot ROM files are available on the storage media, you can specify a file for the next
device boot by executing the following command. A main boot file is used to boot a device and a backup
boot file is used to boot a device only when a main boot file is unavailable.
You must save the file for the next device boot under the root directory of the device. You can copy or
move a file to change the path of it to the root directory.

Disabling Boot ROM Access

By default, you can press Ctrl+B to enter the Boot ROM menu to configure the Boot ROM. However,
this may bring security problems to the device. Therefore, the device provides the function of disabling
the Boot ROM access to enhance security of the device. After this function is configured, no matter
Use the command...
system-view
bootrom-update
security-check enable
quit
bootrom update file file-url
Use the command...
boot-loader file file-url { main |
backup }
1-5
Remarks
—
Optional
By default, the validity check
function is enabled at the time
of upgrading Boot ROM.
—
Required
Available in user view.
Remarks
Required
Available in user view.