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The Cisco UCS 2304 Fabric Extender has four 40 Gigabit Ethernet, FCoE-capable, Quad Small Form-Factor Pluggable (QSFP+) ports that connect the blade chassis to the fabric interconnect. Each Cisco UCS 2304 can provide one 40 Gigabit Ethernet ports connected through the midplane to each half-width slot in the chassis, giving it a total eight 40G interfaces to the compute. Typically configured in pairs for redundancy, two fabric extenders provide up to 320 Gbps of I/O to the chassis.
Up to two fabric extenders can work in the Cisco UCS 5100 Series Blade Server Chassis
Active-active data-plane operation with failover
Capability to fail over from one fabric extender to another in the event of a failure
Active-passive management-plane operation
Support for nonstop management-plane functions; if the active fabric extender fails, the passive fabric extender takes over the chassis management functions
Management
Management of fabric extenders integrated into Cisco UCS Manager
Capability to manage blade server chassis components such as power supplies, fans, and blades in conjunction with the fabric interconnect
Firmware levels between the fabric extender and fabric interconnect always synchronized