Ethernet VPN


Ethernet VPN is a technology for carrying layer 2 Ethernet traffic as a virtual private network using wide area network protocols. EVPN technologies include Ethernet over Multiprotocol Label Switching and Ethernet over Virtual Extensible LAN.
EVPN uses encapsulation methods to enhance the efficiency and scalability of Ethernet traffic over MPLS or IP-based networks. The Ethernet frames are encapsulated within MPLS or VXLAN headers for transport.

MPLS encapsulation

In MPLS-based EVPN, Ethernet frames are encapsulated with:
  1. MPLS label stack: Each EVPN instance is associated with a unique label that helps in identifying the destination bridge domain.
  2. Control word : Provides additional information for synchronization and alignment in certain scenarios.
The encapsulated packet flow includes:Original Ethernet frameMPLS labelsOuter IP header
EVPNs are covered by a number of Internet RFCs, including:
*