The Cisco Catalyst 4500 E-Series is a high-performance next-generation extension to the Cisco Catalyst 4500 series. The "E-Series" is composed of the Cisco Catalyst 4500 series supervisor engine 6-E with CenterFlex technology, E-Series line cards, and E-Series chassis that are designed for secure, flexible, nonstop communications with superior backward and forward compatibility delivering exceptional investment protection for organizations of all sizes.