. The new Chapter 17: Cisco 6500 Multilayer Switches architecture will allow eight 10 Gbps ports per blade with no oversubscription. Cisco now only produces the enhanced chassis models, though the standard chassis models are still available though the secondhand market. Supervisors Chassis-based switches do not have processors built into them like smaller switches do. Instead, the processor is on a module, which allows the hardware to be swapped and upgraded with ease. The processor for a Cisco chassis-based switch is called a supervisor. Supervisors are also commonly referred to as sups (pronounced like "soups"). Over the years, different supervisor models have been introduced to offer greater speed and versatility. Increased functionality has also been made available via add-on daughter cards, which are built into the later supervisor models. Supervisors offer layer-2 processing capabilities, while an add-on daughter card- called a multilayer switch feature card-supports layer-3 and higher functionality. Supervisor models 1 and 2 offer the MSFC as an add-on, while later models include the MSFC as an integral part of the supervisor. When running hybrid-mode IOS on the 6500 chassis, the MSFC is considered a sep- arate device regardless of the supervisor model. In CiscoView, the MSFC appears as a small router icon to the left of the supervisor, where the fan tray resides. Figure 17-4 shows the CiscoView representation of a Supervisor-720 with the MSFC on the left. STATUS WS-SUP 120- 38 CONSOLE ERVISOR 720 WITH INTEGRATED SWITCH EJECT WS-SUP 120-38 CONSOLE WITH INTEGRATED EJECT STATUS HUTDOWN FIREWALL SERVICES MODULE Figure 17-4. Cisco View representation of Supervisor-720 and MSFC Architecture Different versions of the MSFC are referenced as MSFC1, MSFC2, and MSFC3. The MSFC2 is paired with the Supervisor-2, while the MSFC3 is part of the Supervisor-720. The policy feature card (PFC) is a daughter card that supports Quality of Service functions in hardware, drastically improving performance where QoS is needed. No