Preference-based EVPN DF Election

The information below is for an old version of the document
Document Type Expired Internet-Draft (bess WG)
Authors Jorge Rabadan  , Senthil Sathappan  , Tony Przygienda  , Wen Lin  , John Drake  , Ali Sajassi  , 
Last updated 2018-10-11 (latest revision 2018-04-09)
Replaces draft-rabadan-bess-evpn-pref-df
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


RFC7432 defines the Designated Forwarder (DF) in (PBB-)EVPN networks as the PE responsible for sending broadcast, multicast and unknown unicast traffic (BUM) to a multi-homed device/network in the case of an all-active multi-homing 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 Ethernet Segment Identifier (ESI) to the EVPN network, according to the 'service-carving' algorithm. While 'service-carving' provides an efficient and automated way of selecting the DF across different EVIs or ISIDs 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 current RFC7432 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.)