FC, the Sup-1A is capable of Layer-2 to Layer-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. If you find one in the wild today, it should be replaced. Supervisor-2 This model was the standard in backbone and ecommerce website switching until the Supervisor-720 was released. The Supervisor-2 is capable of 30 Mpps and 256 Gbps when paired with an SFM. 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 to Layer-4 forwarding as well as enhanced security and QoS. This module is also pretty old now and should be replaced where possible. 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 super- visors 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. Architecture 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 critical core implementations. The Supervi- sor-720 includes the PFC3 and MSFC3 as well as new accelerated CEF and dCEF capabilities. Fabric-only modules are capable of 40 Gbps throughput when coupled with a Sup-720. Supervisor-720-10GVSS This supervisor is similar to the Sup-720, but includes two 10 Gb Ethernet ports. It also supports a new feature called Virtual Switching System (VSS). VSS allows two 6500s to be clustered together into a single logical switch. Similar in principle to the stacking technology found on Cisco 3750s, VSS allows EtherChannels to be split between two physical switches. Details of VSS are included later in this chapter. Modules Modules for the 6500 chassis are designed to support on