Upgrade the Cisco IOS

Upgrade the Cisco IOS

Upgrade Cisco IOS
Fig 1: Upgrade Cisco IOS 

Upgrading the Cisco IOS on a Cisco switch/router involves several steps to ensure a smooth and successful upgrade process. Here's a general outline of the steps you can follow:

Important Note: Before you proceed, make sure you have a backup of your current configuration and verify the compatibility of the new IOS version with your hardware.


1. Check Current IOS Version: Log in to your switch and check the current IOS version by running the following command:

   show version

     This command will display information about the current IOS version, the hardware model, and more.


2. Download the New IOS Image: Obtain the new IOS image from the Cisco website (https://www.cisco.com). You will need a valid Cisco account with the appropriate privileges to download the software. Download the image to a TFTP server or a USB drive that you can connect to the switch.


3. Transfer the New IOS Image to the Switch/Router:

   - If you have a TFTP server, you can use the `copy tftp flash` command to transfer the new IOS image to the device. For example:

     copy tftp flash

     Address or name of remote host: <TFTP server IP address>

     Source filename: <Name of the IOS image file>

     Destination filename: <Desired destination filename>

   - If you have a USB drive, you can use the `copy usbflash0:` command to copy the IOS image from the USB drive to the switch's flash memory.


4. Verify the File Transfer: After transferring the IOS image, use the `dir flash:` command to verify that the new image file is in the device's flash memory.


5. Set the Boot System: Ensure that the new IOS image is set as the boot system image. You can do this using the following command:



   config terminal

   boot system flash:<Name of the new IOS image file>



6. Save Your Configuration: Save your running configuration to the startup configuration to ensure that your settings are preserved after the upgrade:

   write memory


7. Reload the Switch/Router: To activate the new IOS image, reload the switch by entering the following command:



8. Verify the Upgrade: After the switch reboots, log in and verify that the new IOS version is active by running the `show version` command again.


9. Test Your Configuration: Test your network configuration and ensure that everything is working as expected.


10. Backup Configuration Again: After confirming that the upgrade was successful, make another backup of your configuration with the new IOS version.

Remember that upgrading the IOS image can disrupt network services, so it's essential to plan the upgrade during a maintenance window or a time when network downtime can be tolerated. Additionally, consult Cisco's documentation and release notes for the specific IOS version you're upgrading to for any additional considerations or requirements.

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