![]() Within my Cisco IOS license, I downloaded IOS version 5.bin and made it available to download from the TFTP server on my PC. I started with a Cisco 2811 Router running IOS 12.4(3g). How to perform a warm upgrade in the Cisco IOS Without further delay, let's see how to use these powerful Cisco IOS features. Both of these Cisco IOS features - warm upgrade and warm reload - are there to minimize router downtime anytime you do a router upgrade or reboot. As network administrators, it is our job to minimize network downtime. Routers are one of the most critical features of your network infrastructure. The warm reload feature of the Cisco IOS was offered in IOS version 12.3(2)T. ![]() The warm upgrade feature of the Cisco IOS was offered in Cisco IOS version 12.3(11)T. What are the warm upgrade and warm reload features? Here is how I performed a warm upgrade and warm reboot on a Cisco 2811 Router. By using these features, you can minimize downtime for your end users when you have to upgrade or reboot your router. I had read about the new Cisco IOS warm upgrade and warm reload features, and I took this opportunity to test them out. Recently, I wanted to upgrade my test router to the latest IOS.
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