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EVPN Multi-Homing Extensions for Split Horizon Filtering

Document Type Expired Internet-Draft (bess WG)
Authors Jorge Rabadan , Kiran Nagaraj , Wen Lin , Ali Sajassi
Last updated 2022-04-18 (Latest revision 2021-10-15)
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state In WG Last Call
Revised I-D Needed - Issue raised by WGLC
Document shepherd (None)
IESG IESG state Expired
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)
This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at:


Ethernet Virtual Private Network (EVPN) is commonly used along with Network Virtualization Overlay (NVO) tunnels. The EVPN multi-homing procedures may be different depending on the NVO tunnel type used in the EVPN Broadcast Domain. In particular, there are two multi-homing Split Horizon procedures to avoid looped frames on the multi-homed CE: ESI Label based and Local Bias. ESI Label based Split Horizon is used for MPLSoX tunnels, E.g., MPLSoUDP, whereas Local Bias is used for others, E.g., VXLAN tunnels. The current specifications do not allow the operator to decide which Split Horizon procedure to use for tunnel encapsulations that could support both. Examples of tunnels that may support both procedures are MPLSoGRE, MPLSoUDP, GENEVE or SRv6. This document extends the EVPN Multi-Homing procedures so that an operator can decide the Split Horizon procedure for a given NVO tunnel depending on their own requirements.


Jorge Rabadan
Kiran Nagaraj
Wen Lin
Ali Sajassi

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)