Cisco UCS has a unique architecture that integrates compute, data network, and storage network access into a common set of components under a single management interface.
Cisco UCS fuses access layer networking and servers. The hardware and software components support the Cisco UCS unified fabric, which runs multiple types of data center traffic over a single converged network adapter. Network access-layer fragmentation is reduced when switching is not used within a Cisco UCS 5108 Blade Server Chassis. This simplification reduces the number of switches, cables, adapters, and management points by up to two thirds. All devices in a Cisco UCS domain remain under a single management domain, which remains highly available by using redundant components.
The following figure shows a Cisco UCS mixed server configuration:
The following figure shows a Cisco UCS C-Series Rack Server direct connect mode: