How many bytes does a VxLAN header add to an original Ethernet frame?

https://www.arista.com/assets/data/pdf/Whitepapers/Arista_Networks_VXLAN_White_Paper.pdf

A VxLAN header adds 50 bytes to an original Ethernet frame. This is because a VxLAN header consists of the following components:

8-byte outer UDP header for VxLAN: The default VxLAN destination UDP port number is 47891

20-byte outer IP header: Valid addresses of VTEPs or VxLAN multicast groups on the transport network. Devices in the transport network forward VxLAN packets based on the outer IP header1

8-byte VxLAN header: VxLAN information for the frame. It includes a 24-bit VxLAN Network Identifier (VNI) that identifies the VxLAN of the frame, and an 8-bit flags field that indicates the validity of the VNI1

14-byte inner Ethernet header: The original Ethernet header of the encapsulated frame. It includes the source and destination MAC addresses, the EtherType, and optionally a 4-byte VLAN tag2

The total size of these components is 8 + 20 + 8 + 14 = 50 bytes. Therefore, a VxLAN header adds 50 bytes to an original Ethernet frame.

References :=

VXLAN packet format - Aruba

MTU Considerations for VXLAN | Matt Oswalt