Ethernet VPN
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Short description: Technology for carrying Ethernet traffic over wide area networks
Ethernet VPN (EVPN) 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 (MPLS) and Ethernet over Virtual Extensible LAN (VXLAN).[1][2]
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:
- MPLS label stack: Each EVPN instance is associated with a unique label that helps in identifying the destination bridge domain.
- Control word (optional): Provides additional information for synchronization and alignment in certain scenarios.
The encapsulated packet flow includes:
- Original Ethernet frame
- MPLS labels
- Outer IP header (in case of IP/MPLS networks)
EVPNs are covered by a number of Internet RFCs, including:
See also
References
- ↑ "EVPN Overview - TechLibrary - Juniper Networks". https://www.juniper.net/documentation/en_US/junos/topics/concept/evpns-overview.html.
- ↑ "Understanding EVPN with VXLAN Data Plane Encapsulation - TechLibrary - Juniper Networks". https://www.juniper.net/documentation/en_US/junos/topics/concept/evpn-vxlan-data-plane-encapsulation.html.
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