Cisco FlexStack-Plus Network stacking module. Cisco Catalyst 2960-X Series Switches are the next generation of the world’s most widely deployed access switches. They enable intelligent services such as application visibility, Smart Operations, Layer 3 routing and deliver best-in-class energy efficiency with up to 80 percent energy savings. Designed for operational simplicity to lower TCO, this platform also offers investment protection with mixed stacking with existing Cisco Catalyst 2960-S and 2960-SF switches.