VMware Cross-Cloud Architecture

MTU on the transport network

When leveraging encapsulation technologies, it is important to increase the MTU supported both on ESXi hosts, as well as on all interfaces of the devices deployed in the physical network. VXLAN adds 50 bytes to each original frame, leading to the recommendation to increase the MTU size to at least 1,600 bytes. The MTU on the ESXi server, both for the internal logical switch and for the VDS uplinks, is automatically tuned to 1,600 bytes when provisioning VXLAN to hosts from the NSX Manager UI.