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Catalyst 5000 Series  Catalyst 5000 Series Parts WS-X5506 Cisco Catalyst 5002/5000/5505/5500 Supervisor II
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The new, used or refurbished Cisco WS-X5506 you are interested in is a: Cisco Catalyst 5002/5000/5505/5500 Supervisor II.
Supervisor Engine 2 acts as the control module for the new architecture built around the crossbar fabric that interconnects all the line cards with point-to-point, full-duplex serial connections. Supervisor Engine 2 is a key component of the CEF-based distributed forwarding architecture. PFC2 is a critical component of the distributed forwarding architecture. With Supervisor Engine 2, both Layer 2 and Layer 3 performance is doubled to 30 Mpps. A Supervisor Engine 2 equipped with a PFC2 and an optional MSFC2 enables a distributed forwarding mechanism for both Layer 2 and Layer 3 that is an effective solution for service providers as well as large enterprises. In a CEF-based architecture, a FIB and an adjacency table is created for Layer 3 forwarding. This FIB has the most current routing information and eliminates the need for the first packet of every flow to be switched in software. When an MSFC2 is not present, Layer 2 forwarding is also performed centrally in hardware. | 
