Which protocol is used as the link-state routing protocol for a DFA fabric?

VXLAN (Virtual Extensible LAN) is a Layer 2 overlay encapsulation protocol used for extending virtual networks, not a link-state routing protocol for the underlying fabric.

EIGRP (Enhanced Interior Gateway Routing Protocol) is a Layer 3 distance-vector/hybrid routing protocol used for IP routing, not the link-state protocol for a Layer 2 FabricPath fabric.

Cisco DFA (Data Center Fabric Architecture), which leverages technologies like FabricPath, uses an enhanced version of IS-IS (Intermediate System to Intermediate System), known as FabricPath IS-IS, as its link-state routing protocol to establish Layer 2 multipathing and manage the forwarding topology.

OSPF (Open Shortest Path First) is a Layer 3 link-state routing protocol used for IP routing, not the specific link-state protocol governing the Layer 2 forwarding plane of a FabricPath DFA fabric.