Managing IOS Images

Managing IOS Images

Broad Objective:

To create and load a backup copy of Cisco IOS software image in case you lose software image in the router.

Other Objectives:

1. Getting new IOS image from Cisco
2. Backing up the currently used, older version from your routers.
3. Updating your router with new images.
4. Testing new image

 Following steps are required to upgrade an IOS image in to flash memory:

Step1: Obtain an IOS image from Cisco.

Step2: Place the IOS image in to the default directory of TFTP server (also called Network server).

Step3: Copy the file into flash memory.

Command to copy the IOS image to Flash Memory

Router#copy tftp flash

This command will prompt you for the IP address of the remote host (tftp server) and the name of the source and destination system image file.

Each exclamation point (!) means that one User Datagram Protocol (UDP) segment has been successfully transferred.

Recovering Password

Before proceeding password recovery we need to keep following points into our consideration:

By default router gets booted from flash.

Step	Function	How to DO This for 1600,2600,3600,4500,7200, 7500	How to DO This for 2500,3000,4000,7000
1.	Turn router off, and then turn it on.	Use the power switch	Same as other routers.
2.	Press the Break key within the first 60 seconds.	Find the Break key on your console devices keyboard. Ctrl+break.	Same as other routers.
3.	Change the configuration register so that bit 6 is 1.	Use the rommon command confreg, and answer the prompts.	Use the rommon command o/r 0x2142 at the > prompt to boot from flash memory or o/r 0x2141 to boot from the boot ROMs.
4.	Cause the router to load an IOS.	Use the rommon reload/reset Command or, if unavailable, Power off and on.	Use rommon command Initialize command to initialize the router.
5.	Avoid using setup mode, which will be prompted for at console.	Just say no.	Same as other routers.
6.	Enter privileged mode at console.	Press Enter and use enable command (no password required).	Same as other routers.
7.	View startup config to see unencrypted passwords.	Use exec command show startup-config.	Same as other routers.
8.	Use appropriate config commands to reset encrypted commands.	To change the password, if it is encrypted, enter the following command, for example: Router#copy start run Router#config t Router(config)#enable secret 123	Same as other routers.
9.	Enable all interfaces.	Give no shutdown command. for example: Router(config)#int e0 Router(config-if)#no shutdown
10.	Save new password.	Use the following command: Router(config-if)#ctrl-z Router(config)#copy running- config startup-config	Same as other routers.
11.	Change config register back to original value.	Use following config command: Router(config) #config-reg 0x2102	Same as other routers.
12.	Reload the router	Enter the following reload command at the privileged EXEC prompt: Router#reload	Same as other routers.