The Cisco® Catalyst® Operating System (Catalyst OS) Software Release 8.4 for the supervisor engine supports the Cisco Catalyst 6500 Series multilayer switches.

Overview
Cisco Catalyst OS continues to provide several innovative features in the areas of high availability, operational manageability, security, and quality of service (QoS), allowing customers to deploy scalable, highly available, and secure networks from the access layer to the WAN edge. Cisco Catalyst OS as a Layer 2 Forwarding software targets the wiring closets or access layer service deployments. Along with Cisco Catalyst OS and Cisco IOS® Software, the system in a hybrid mode can be used for offering Layer 2 through 4 services suited for WAN edge, core, and distribution layer deployments. Cisco Systems® is committed to delivering feature enhancements in Cisco Catalyst OS, supporting Layer 2 through 7 services with existing and next-generation supervisor engines and modules.
Cisco Catalyst OS Software Release 8.4 supports four generations of supervisor engines-Supervisor Engine 1A, Supervisor Engine 2, Supervisor Engine 720, and the recently announced Cisco Catalyst 6500 Series Supervisor Engine 32.