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The system files includes system image file and boot file. The updating of the switch
is to update the two files by overwrite the old files with the new ones.
The system image files refers to the compressed files of the switch hardware drivers,
and software support program, etc, namely what we usually call the IMG update file. The
IMG file can only be saved in the FLASH with a defined name of nos.img
The boot file is for initiating the switch, namely what we usually call the ROM update
file ((It can be compressed into IMG file if it is of large size). The boot file can only be
saved in the ROM in which the file name is defined as boot.rom
The update method of the system image file and the boot file is the same. The
switch supplies the user with two modes of updating: 1. BootROM mode; 2. TFTP and
FTP update at Shell mode. This two update method will be explained in details in
following two sections.
2.5.2 BootROM Upgrade
There are two methods for BootROM upgrade: TFTP and FTP, which can be
selected at BootROM command settings.
Fig 2-3 Typical topology for switch upgrade in BootROM mode
The upgrade procedures are listed below:
Step 1:
As shown in the figure, a PC is used as the console for the switch. A console cable is
used to connect PC to the management port on the switch. The PC should have
FTP/TFTP server software installed and has the img file required for the upgrade.
Step 2:
Press “ctrl+b” on switch boot up until the switch enters BootROM monitor mode. The
operation result is shown below:
cable
connection
Console cable
connection