Network setup - How to - Routers - Cisco - Linux

Before beginning to describe the steps to upgrade a system IOS for a Cisco device, I recommend you perform this activity only if necessary.

1. Download a version of IOS you need or that meets the requirements of your system.
2. Install an FTP or TFTP server (I recommend working with "tftp server" Solardwinds) while another may serve.
3. Verify that the router has enabled "ftp-server enable".
4. Perform the following steps.

Router#copy tftp: flash:
Address or name of remote host []? 10.1.10.21
Source filename []? c2800nm-spservicesk9-mz.124-4.T.bin
Destination filename [c2800nm-spservicesk9-mz.124-4.T.bin]?
Accessing tftp://10.1.10.21/c2800nm-spservicesk9-mz.124-4.T.bin...
Loading c2800nm-spservicesk9-mz.124-4.T.bin from 10.1.120.21 (via FastEthernet0/1): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

After you copy the new IOS, perform the following:

Router(config)#boot system flash:c2800nm-spservicesk9-mz.124-4.T.bin (new IOS)
Router(config)#boot system flash:c2800nm-ipbase-mz.123-8.T8.bin (old IOS)


Made these changes can verify if it really is using the new IOS with the command

Router#show version
Cisco IOS Software, 2800 Software (C2800NM-IPBASE-M), Version 12.3(8)T8, RELEASE SOFTWARE (fc1)
ROM: System Bootstrap, Version 12.3(8r)T7, RELEASE SOFTWARE (fc1)
TMP_1 uptime is 2 hours, 4 minutes
System returned to ROM by power-on
System image file is "flash:c2800nm-spservicesk9-mz.124-4.T.bin"

Note: The name of the new IOS is "c2800nm-spservicesk9-mz.124-4.T.bin" (new IOS) and IOS of the above is "c2800nm-ipbase-mz.123-8.T8.bin", for this example.