Cisco UCS C-Series Rack Servers can connect directly to the FIs without the use of FEX with direct connect mode.
Direct connect mode enables Cisco UCS Manager to manage the Cisco UCS C-Series Rack Servers using a single cable for both management and data traffic. The Cisco UCS VIC connects to the FI using a single connection from each VIC to each FI. This method is used for configurations that require fewer servers.
Different generation of VICs are not supported in a single server and should be either Cisco UCS VIC 13xx or 14xx series.
Third-generation Cisco UCS C-Series Rack Servers in direct connect mode contains the following features:
Fourth-generation Cisco UCS C-Series Rack Servers in direct connect mode contains the following features:
Note: Dual-link connectivity is supported on Cisco UCS fourth-generation FIs. Cisco UCS third-generation FIs support single-link port channels for FC/FCoE between Cisco UCS VIC 1455 or Cisco UCS 1457 adapters on Cisco UCS C-Series Rack Servers in direct connect mode.
The following figure shows a direct connection between the Cisco UCS C-Series Rack Server and the Cisco UCS 6332-16UP Fabric Interconnects:
The following figure shows direct connect mode between the Cisco UCS C-Series Rack Server and the Cisco UCS 6454 Fabric Interconnects:
When a Cisco UCS VIC 1455 is connected to a Cisco UCS 6454 Fabric Interconnect through a 25 Gbps cable, manually configure the server port. Port autodiscovery is not supported.