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VXLAN—EVPN Overlay Overview

Spanning Tree Protocol (STP), multichassis link aggregation group (MC-LAG), and Transparent Interconnection of Lots of Links (TRILL) were some of the commonly used technologies in traditional data centers. However, as the data centers started to grow exponentially, these technologies were not able to scale to meet the requirements of data centers. To cater to these requirements, data center administrators started using orchestration tools such as VMware vCenter, VMware vCenter with NSX, OpenStack, and OpenStack with NSX plug-in to orchestrate the networking needs of the tenants that a data center serves. This approach meant that the data center might require additional plug-ins to configure VLANs and gateways or that you might need to make changes to the physical network topology, to accommodate a new tenant. Most of the current day data centers handle multiple customer groups, organizations, or tenants that require a new data center architecture that decouples the underlay network from tenant overlay networks. A Layer 3 Fabric underlay coupled with a Virtual Extensible LAN (VXLAN)–Ethernet VPN (EVPN) overlay solution that uses bare metal servers and/or virtual servers, or both Network Director for management enables data center and cloud operators to deploy much larger networks than that are otherwise possible with traditional Layer 2 Ethernet-based architectures.

Some of the major advantages that VXLAN—EVPN overlay networks provide are:

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