An engineer requires a solution that achieves Ethernet traffic forwarding on all available paths from the hosts to the Cisco Nexus Fabric Extender and from the Fabric Extenders to the Cisco Nexus 5000

Virtual Port Channel (vPC) allows two upstream switches to act as a single logical switch, but it primarily focuses on active-active forwarding between vPC peers and downstream devices, not specifically FEX to server LACP over multiple FEX paths.

Enhanced Virtual Port Channel (EVPC) provides active-active forwarding from the host to the Fabric Extender (FEX) and from the FEX to the upstream Nexus switch. This design supports LACP EtherChannels from the FEX to the servers, utilizing all available links for bandwidth and redundancy.

Virtual Port Channel Plus (vPC+) is a feature related to FabricPath, which is not the standard FEX deployment described.

Back-to-Back Virtual Port Channel typically refers to a setup where two vPCs are connected directly, which does not directly address the FEX-to-server LACP requirement for full path utilization.