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RFC 9785
Title: Preference-Based EVPN Designated Forwarder (DF)
Election
Author: J. Rabadan, Ed.,
S. Sathappan,
W. Lin,
J. Drake,
A. Sajassi
Status: Standards Track
Stream: IETF
Date: June 2025
Mailbox: [email protected],
[email protected],
[email protected],
[email protected],
[email protected]
Pages: 17
Updates: RFC 8584
I-D Tag: draft-ietf-bess-evpn-pref-df-13.txt
URL: https://www.rfc-editor.org/info/rfc9785
DOI: 10.17487/RFC9785
The Designated Forwarder (DF) in Ethernet Virtual Private Networks
(EVPNs) is defined as the Provider Edge (PE) router responsible for
sending Broadcast, Unknown Unicast, and Multicast (BUM) traffic to a
multihomed device/network in the case of an All-Active multihoming
Ethernet Segment (ES) or BUM and unicast in the case of Single-Active
multihoming. The Designated Forwarder 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 Designated Forwarder across different Ethernet Tags
in the Ethernet Segment, there are some use cases where a more
"deterministic" and user-controlled method is required. At the same
time, Network Operators require an easy way to force an on-demand
Designated Forwarder switchover in order to carry out some
maintenance tasks on the existing Designated Forwarder or control
whether a new active PE can preempt the existing Designated Forwarder
PE.
This document proposes use of a DF election algorithm that meets the
requirements of determinism and operation control. This document
updates RFC 8584 by modifying the definition of the DF Election
Extended Community.
This document is a product of the BGP Enabled ServiceS Working Group of the
IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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