S No                                VDC                                        VRF
1 A VDC virtualizes the device itself by presenting a single device as multiple logical devices. Feature which allows multiple instance of routing table to exist in a Layer 3 device ie a Router or a Layer 3 Switch.
2 VDC provides much more than VRF and Vlans ie separate VRFs, Vlans, STP,FHRP,RIB Data Plane, configuration, administration functionality on each VDC. VRF provides Logical separation of Routing Tables only.
3 Separate Adminstrative and management domains for each VDC. Not possible to have separate of administrative and Management domain for each VRF.
4 Same VLAN can be reused in each VDC Same Vlan ID cannot be reused in each VRF
5 Feature available on Nexus 7K only Feature on almost all L3 devices
6 Advance Services License required to enable VDC VRF starts from IP base License in Routers and IP services in Catalyst Switches.
7 An external connection needs to be made between ports of VDC to perform internal VDC (VDC to VDC) communication. VRF to VRF communication can be internally performed via route leaking without external port connections across VRFs.
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