In an overlay virtual network, a tunnel endpoint is termed a network virtualization edge (NVE). In overlay environments, routing information is typically aggregated in top-of-rack switches (for bare-metal endpoints) or server hypervisors (for virtualized workloads). It provides the ability for all devices in the network to communicate with each other. ![]() The underlay doesn’t actually have any intelligence to keep track of the endpoints or define the end-to-end networking. In data centers, the role of the underlay is to provide reachability for the entire network. Overlay networks implement network virtualization concepts, where L2 and 元 tunneling encapsulation VXLAN, GRE and IPSec serves as the transport overlay protocol, sometimes referred to as OTV (Overlay Transport Virtualization). MPLS networks are a legacy underlay WAN technology that falls between L2 and 元. Internet is an example of an 元 underlay network, where autonomous systems use interior gateway protocols (IGPs) such as OSPF and IS-IS to run control planes, and use BGP as the Internet-wide routing protocol. L2 underlay networks today are typically based on Ethernet, with segmentation accomplished through VLANs. Underlay networks can be L2 or 元 networks. An underlay is the network that transports the overlay network. To preserve the illusion, virtual networks are isolated from one another.Ī virtual network implemented with protocols that leave the transit nodes unaware of it is called a virtual network overlay. In the case of virtual networks, each user is under the illusion that there are no other users of the network. Virtualizing a resource allows it to be shared by multiple users. Network virtualization is the carving up of a single physical network into many virtual networks. Cumulus Linux Deployment Guide for VMware NSX-Tĭata Center Networking Concepts Overlay, Underlay, and Tunneling.Cumulus Linux Configuration Guide for Ethernet Storage Fabrics. ![]() Data Center Network Automation with Ansible.Data Center Network Automation Quick Start Guide.Layer 3 Extensions with VRF Route Leaking.Extending the EVPN/VXLAN Fabric with DCI.Data Center Interconnect Reference Design Guide.Cumulus Linux VXLAN and EVPN Network Reference Design Guide.
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