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For example – “c3725-adventerprisek9-mz124-15.bin”, we will keep the file name same. Enter the Destination file name of the IOS and hit enter.bin as well while entering the source file name. For example – “c3725-adventerprisek9-mz124-15.bin” is the file we have downloaded and is going to upgraded to this version. Enter the Source file name of the IOS file downloaded and hit enter.Enter the TFTP IP Address where the IOS file is located and hit enter.You need to issue command “ copy tftp flash” and hit enter Now you need to upload the latest IOS file downloaded from Cisco website.To do this, issue command on the router “ dir flash:” and hit enter Ensure that you have enough space/memory in your flash to accommodate the latest ios version downloaded from Cisco website.Write the current configuration by issuing the command “ write memory” and also take a backup on your tftp server by issuing the command “ copy running-config tftp“, enter the TFTP Server IP Address and hit enter.Download the latest version from Cisco website (keeping in mind about the open caveats which should not affect your production) and ensure that the IOS is compatible for an upgrade with the current version.Give a “ show version” and see what is the current version of the IOS running in the router.Login to the router using Hyperterminal (recommended in case after the upgrade, the router does not come up) or using Telnet.Please follow the below steps to start with the upgrade.Īssuming you are aware of setting up a TFTP Server and the consequences if the router does not come up after the upgrade. In this post, we will learn how to upgrade Cisco Router IOS.