Ethernet VPN (EVPN)

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EVPN (Ethernet VPN) is a standards-based BGP control plane that provides the ability to extend Layer 2 and Layer 3 connectivity between different data centers.

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Overview of BGP EVPN
Ethernet VPN (EVPN) is a standards-based BGP distributed control plane for Network Virtualization Overlay (NVO), that provides Layer 2 (bridging) and Layer 3 (routing) connectivity over IP or IP/MPLS underlay networks. BGP EVPN was initially designed to be used with MPLS data plane to address limitations of VPLS in service provider networks. However, EVPN has been widely adopted in data centers as a control plane mechanism for VXLAN overlay networking due to advantages in BGP scalability and flexibility.
EVPN Support in NSX
NSX leverages BGP EVPN technology to interconnect and extend NSX-managed overlay networks to other data center environments not managed by NSX, VXLAN encapsulation is used between NSX TEPs (edge nodes and hypervisors) and external network devices to ensure data plane compatibility.
EVPN Inline Mode
In the EVPN Inline mode, MP-BGP sessions with the L2VPN EVPN address family are configured between tier-0 gateways and the external routers. The tier-0 gateway will negotiate the L2VPN EVPN AFI/SAFI with the external BGP peer (data center gateway) and start exchanging EVPN information. In this mode, the edge nodes are in the datapath between internal workloads and external networks.
EVPN Route Server Mode
In the EVPN Route Server mode, the tier-0 service router (SR) hosted on the edge node acts as a BGP route server, establishing BGP control plane sessions with southbound VNFs and external data center routers. ESXi hypervisors exchange the user plane traffic directly with the data center fabric routers using VXLAN encapsulation, bypassing the edge node in the data path.

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