 direct configuration of the PFC is required. The three generations of the PFC are named PFC1, PFC2, and PFC3. The PFC2 is paired with the Supervisor-2, and the PFC3 is an integral part of the Supervisor-720. Models Supervisor models most commonly seen today include: Supervisor-1A This is the slowest and oldest of the supervisor modules, capable of supporting 32 Gbps and 15 Mpps. (The Supervisor-1A replaced the original Supervisor Engine, also called the Supervisor-1.) The Supervisor-1A is end-of-life, but may still be seen in older installations. When coupled with a PFC and an MSFC, the Sup-1A is capable of layer 2-4 forwarding, as well as enhanced security and QoS. The Supervisor-1A was an excellent solution for wiring closets or networks that did not require the throughput and speed of the Supervisor-2. Supervisor-2 This model was the standard in backbone and e-commerce web site switching until the Supervisor-720 was released. The Supervisor-2 is capable of 30 Mpps and 256 Gbps when paired with a Switch Fabric Module. When coupled with a PFC2 and an MSFC2, the Supervisor-2's forwarding capability increases to 210 Mpps, and it is capable of layer 2-4 forwarding as well as enhanced security and QoS. Supervisor-32 This is the latest replacement for the Supervisor-1A. Any existing Supervisor-1As should be replaced with Supervisor-32s. This model differs from the other supervisors in that it includes eight 1-Gbps small-form-factor GBIC ports, or two 10 Gbps Ethernet XENPAK-based ports. Other supervisors will offer, at most, two 1 Gbps ports. Supervisor-720 This model represents a major upgrade to the aging Supervisor-2 architecture. Capable of 400 Mpps and a blazing 720 Gbps, this supervisor is designed for bandwidth-hungry installations and also for critical core implementations. The Chapter 17: Cisco 6500 Multilayer Switches Supervisor-720 includes the PFC3 and MSFC3 as well as new accelerated Cisco Express Forwarding and distributed Cisco Express Forwarding capabilities. Fabric-only modules are capable of 40 Gbp