VMware VMware VMware Cisco This document specifies a mechanism to signal Media Access Control (MAC) addresses move over a Network Virtualization Overlays over Layer 3 (NVO3) virtual tunnel. Such notification is useful in redundancy scenarios when a Layer 2 service that was active on a Network Virtualization Edge (NVE) fails over to a standby NVE. This notification can be used only when data plane mac learning is enabled over the NVO3 tunnels.