The VXLAN and NVGRE Explain

Computer servers running Hyper-V can be set up to expose independent virtual machines to one or more networks.

 Figure 1: NVGRE vs VXLAN: The difference | Source: Fiber Cabling Solutions

Brief

VXLAN is introduced by Cisco while NVGRE is primarily supported by Microsoft. These two titans in the tech industry are jostling to make their standards become the unified standard in the industry.