Router (config) # boot system tftp: //3.bin Specify the TFTP server as the source of the Cisco IOS image, with ROMmon as backup. Router (config) # boot system flash0: //3.bin

Specify the flash device as the source of the Cisco IOS image:.

As shown below, the boot system command is a global configuration command that allows the user to specify the source for the Cisco IOS software image to load.įlash0: //3.binĪmong the available syntax options are the following:.

Several boot system commands can be entered sequentially to provide a boot plan that has fault tolerance. Once you start the router, use the show version command to verify that the new image was loaded.ĭuring boot, the bootstrap code analyzes the boot configuration file in the NVRAM to detect boot system commands that specify the name and location of the Cisco IOS software image to load. Reload the router to boot with the new image. To update the copied IOS image once that image is saved in the router's flash memory, configure the latter to load to a new image during boot using the boot system command.

A new image file ( 3.bin ) will be copied from the TFTP server in 2001: DB8: CAFE: 100 :: 99 to the router.Īfter issuing this command with the specified destination and source URLs, the user will be asked to enter the IP address of the remote host, the name of the source file and the name of the destination file.

Image illustrates how to copy an image of Cisco IOS software from a TFTP server. In this example, IPv6 is used for transfer, to show that TFTP can also be used over IPv6 networks. Ħ8831808 bytes copied in 363,468 secs (269058 bytes / sec)Īfter issuing the command using the specified source and destination URLs, the user is requested to enter the name of the source file, the IP address of the remote host and the name of the destination file. Source filename ? 3.binĪddress or name of remote host ? 172.16.1.100ĭestination filename ? Copy the image to the TFTP server using the copy source-url destination-url command. The sample file is 68831808 bytes in length. Use the show flash0: command on the router to determine the size of the Cisco IOS image file. Verify that the TFTP server has enough disk space to support the Cisco IOS software image. Ping the TFTP server to test connectivity. Make sure there is access to the network TFTP server. To back up the Cisco IOS image on a TFTP server, follow these three steps:

You can learn the Cisco IOS name convention here. In following figure, the network administrator wishes to back up the current image file on the router ( 3.bin ) on the TFTP server at 172.16.

Cisco ios tftp server