What command should be executed to upgrade between two different Junos OS releases with no disruption to the control plane?

To upgrade between two different Junos OS releases with no disruption to the control plane, the appropriate command is to use 'request system software in-service-upgrade'. This command facilitates an in-service upgrade, allowing the control plane to remain operational while the new software version is being installed. It minimizes downtime and is crucial for environments where continuous availability is necessary, such as in production networks.

The in-service upgrade process involves careful handling of the system resources, enabling the switch to the new Junos OS version without interrupting ongoing processes or sessions. This method is particularly beneficial for maintaining service continuity, which is often a critical requirement in networking environments.

Other commands, while useful in their own contexts, do not provide the same level of service continuity. For instance, upgrading with other commands may result in temporary disruption and affect network services, which is not ideal for situations demanding minimal service interruption.