Preference-based EVPN DF Election

Document Type Expired Internet-Draft (bess WG)
Authors Jorge Rabadan  , Senthil Sathappan  , Tony Przygienda  , Wen Lin  , John Drake  , Ali Sajassi  , 
Last updated 2020-12-21 (latest revision 2020-06-19)
Replaces draft-rabadan-bess-evpn-pref-df
Stream IETF
Intended RFC status Proposed Standard
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state WG Consensus: Waiting for Write-Up
Document shepherd Stephane Litkowski
IESG IESG state Expired
Consensus Boilerplate Yes
Telechat date
Responsible AD (None)
Send notices to Stephane Litkowski <>

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The Designated Forwarder (DF) in Ethernet Virtual Private Networks (EVPN) is defined as the PE responsible for sending Broadcast, Unknown unicast and Broadcast traffic (BUM) to a multi-homed device/ network in the case of an all-active multi-homing Ethernet Segment (ES), or BUM and unicast in the case of single-active multi-homing. The DF is selected out of a candidate list of PEs that advertise the same Ethernet Segment Identifier (ESI) to the EVPN network, according to the Default DF Election algorithm. While the Default Algorithm provides an efficient and automated way of selecting the DF across different Ethernet Tags in the ES, there are some use-cases where a more 'deterministic' and user-controlled method is required. At the same time, Service Providers require an easy way to force an on-demand DF switchover in order to carry out some maintenance tasks on the existing DF or control whether a new active PE can preempt the existing DF PE. This document proposes an extension to the Default DF election procedures so that the above requirements can be met.


Jorge Rabadan (
Senthil Sathappan (
Tony Przygienda (
Wen Lin (
John Drake (
Ali Sajassi ( (

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