Boot system command: –

This command should be use when configuration register value is set to it’s default value i.e. 2102

1) #conf t
    #boot system flash <ios file name>

2)  #conf t
     #boot system tftp

While booting up router will reach tftp server and it will load IOS file from the tftp server

Command to take backup of your IOS file in TFTP server
#copy flash TFTP

Before you back up your IOS image to an external server, you should perform the following checks:
* Is the server reachable
* Is there enough disk space on the server to hold the IOS image
* Does server support the file nomenclature that you want to use
* Does file have to exist on the server before you can perform  the copy?

Command to Load IOS file from TFTP server in to FLASH memory

#copy TFTP flash

Another way to take a backup:

1. Install TFTP server application.
2. To remove all information = #write erase
3. To restart the router = #reload
4. Configure the router (assign the IP address compulsory: without IP address backup is not possible.)
5. Router#copy startup-config :tftp
6. Address or remote host name: (IP address) e.g. 10.0.0.2
7. Destination file name: (Name) e.g. backuprouter
8. Router# write erase
9. #reload
10. First assign FastEthernet IP address in router
11. Router#copy tftp: startup-config
12. Address or name of remote host: 10.0.0.2
13. Destination filename

[ startup-config ]

(press enter)

1. #copy startup-config running-config
2. Destination filename

[ running-config ]

(press enter)

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