3com MSR 20-20 참조 매뉴얼

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There are many types of storage media such as Flash, compact Flash (CF), universal 
serial bus (USB), and hard disk. Different devices support different types of storage 
device. CF card is exemplified in this document.
File names in this document comply with the following rules
Path + file name (namely, a full file name): File on a specified path. A full file 
name consists of 1 to 135 characters.
File name" (namely, only a file name without a path): File on the current 
working path. The file name without a path consists of 1 to 91 characters.
boot-loader
Syntax
boot-loader file file-url [ slot slot-number ] { main | backup }
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Parameter
file file-url: Specifies a file name, a string of 1 to 64 characters.
slot slot-number: Specifies the slot number of a card. The value range varies with 
devices.
main: Specifies a file as a primary boot file.
backup: Specifies a file as a secondary boot file.
Description
Use the boot-loader command to specify a boot file on a card.
By default, the boot file is specified as a primary boot file.
A primary boot file is used to boot a device and a secondary boot file is used to 
boot a device only when a primary boot file is unavailable.
Related command:
Example
# Specify the primary boot file of the interface card in slot 2 on a device as 
plat.bin.
<Sysname> boot-loader file plat.bin main
This command will set boot file, Continue? [Y/N]:y
The specified file will be used as the main boot file at the next reboot!