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 MPLS and Ethernet over VXLAN.[1][2]
EVPN uses encapsulation methods to ensure efficient and scalable transmission of Ethernet traffic over MPLS or IP-based networks. The encapsulation encapsulates Ethernet frames within MPLS or VXLAN headers for transport.
MPLS Encapsulation
[edit]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:
- RFC 7209 "Requirements for Ethernet VPN (EVPN)",
- RFC 7432 "BGP MPLS-Based Ethernet VPN",
- RFC 8365 "A Network Virtualization Overlay Solution Using Ethernet VPN (EVPN)",
- RFC 8317 "Ethernet-Tree (E-Tree) Support in Ethernet VPN (EVPN) and Provider Backbone Bridging EVPN (PBB-EVPN)".
- RFC 9161 "Operational Aspects of Proxy ARP/ND in Ethernet Virtual Private Networks".
References
[edit]- ^ "EVPN Overview - TechLibrary - Juniper Networks". www.juniper.net. Retrieved 2019-12-19.[dead link]
- ^ "Understanding EVPN with VXLAN Data Plane Encapsulation - TechLibrary - Juniper Networks". www.juniper.net. Retrieved 2019-12-19.[dead link] Ethernet Virtual Private Network (EVPN): Comprehensive Guide
See also
[edit]
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