How it works...

After upgrading to VMM 2016, you are required to update the VMM agent on the Hyper-V hosts and VMM library servers. Although this process does not require immediate action after the upgrade (as the previous VMM 2012 R2 agent versions are supported by VMM 2016), take into account that the previous versions do not provide the functionalities that the new VMM agent does. However, in some rare cases (for example, when you have an unsupported VMM agent installed on hosts as shown in the following screenshot), you might need to uninstall agents manually on hosts and then install the agents by using the VMM console: