Cisco WS-C3550-48-SMI enterprise networking (router/Catalyst switch/UCS families) Datacentre Switch

The Cisco WS-C3550-48-SMI is a Catalyst 3550 fixed-configuration switch with 48 10/100 Fast Ethernet ports plus 2 GBIC-based Gigabit Ethernet uplink slots, running the Standard Multilayer Image (SMI). The Catalyst 3550 is a Layer 2/limited-Layer 3 switch, and the SMI feature set covers standard switching, basic IP routing (static routes and RIP) and core QoS, sitting below the Enhanced Multilayer Image (EMI) that adds full dynamic routing protocols and advanced QoS/security features. It is a fixed, non-modular switch, and the fitted GBIC uplinks can be swapped independently for SX, LX or copper variants as the uplink medium requires. Genuine spares of this model are a routine requirement for replacing failed units or extending capacity in networks that already standardise on the 3550-48-SMI, and remain a common bench-test candidate for smaller edge deployments. Tech-Star (UK-based, shipped worldwide) stocks Cisco switches to support ongoing network maintenance projects.