This lab will discuss and demonstrate the IOS recovery procedure for fixed configuration Catalyst series switches using xModem. Recovering the Cisco IOS image on a Cisco switch is one of those tasks that is nice to know and not need it then need it and not know it. In the field you may find yourself faced with a Cisco switch that cannot boot up or crashes when booting up due to a possible IOS Image corruption. Unfortunately fixed configuration switches require the use of xModem to restore a corrupt or missing IOS images unlike the Cisco and Cisco Series supervisor engines which use compact flash cards.

Step 1.

7 Steps to Upgrade IOS Image on Cisco Catalyst Switch or Router

Boot your switch into switch ROM mode. This typically involves holding down the STAT button on the front of the switch when plugging in the power. You can check out the required procedure by clicking HERE! Step 2. Step 3 — OPTIONAL — If your image is corrupted you can format your flash file system by executing the format flash: command as shown below however this will delete your start-up configuration!!!

Tools and Related

Knowing how get help will make your job easier as Cisco IOS includes thousands of commands with numbers of switches and parameters. Open Packet Tracer and click End devices.

Click Connections. Sever has multiple IOS images for practice. To verify it click on Config menu tab and expend the Services left menu item. If you find it difficult to replicate this practice lab in your packet tracer, download this pre-created practice lab and load it in packet tracer.

How to Upgrade Cisco IOS Bootstrap | phon-er.com

Packet Tracer Practice Lab. Now we are connected with Router. It takes three parameters. To use name we need to configure DNS service on router. In next step we would delete the current IOS.

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Next command will delete IOS from flash. If you are following this practice on real device skip this stage, unless you are doing it under the supervision of an expert.

If you are following this practice on packet tracer, go ahead. Router will work as it is until we reload it. Enter reload command in privileged mode to reload the router.

You can list all available commands by entering? Set above variables and enter tftpdnld command.

How to upgrade Cisco IOS

Command will list all variables for your confirmation. If any variable need to be correct type N and reset that variable before executing this command again. If all variables are correct, type Y to confirm the download operation.

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In few minutes IOS would be download in flash. Once this process is completed use reset command to reload the system. We have successfully restored the IOS. Router does not store any running configuration automatically.