Framework for Ethernet VPN Designated Forwarder Election Extensibility
RFC 8584

Document Type RFC - Proposed Standard (April 2019; No errata)
Updates RFC 7432
Last updated 2019-04-24
Replaces draft-ietf-bess-evpn-df-election, draft-ietf-bess-evpn-ac-df
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Stephane Litkowski
Shepherd write-up Show (last changed 2018-05-24)
IESG IESG state RFC 8584 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Martin Vigoureux
Send notices to Stephane Litkowski <stephane.litkowski@orange.com>
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                   J. Rabadan, Ed.
Request for Comments: 8584                                         Nokia
Updates: 7432                                            S. Mohanty, Ed.
Category: Standards Track                                     A. Sajassi
ISSN: 2070-1721                                                    Cisco
                                                                J. Drake
                                                                 Juniper
                                                              K. Nagaraj
                                                            S. Sathappan
                                                                   Nokia
                                                              April 2019

 Framework for Ethernet VPN Designated Forwarder Election Extensibility

Abstract

   An alternative to the default Designated Forwarder (DF) selection
   algorithm in Ethernet VPNs (EVPNs) is defined.  The DF is the
   Provider Edge (PE) router responsible for sending Broadcast, Unknown
   Unicast, and Multicast (BUM) traffic to a multihomed Customer Edge
   (CE) device on a given VLAN on a particular Ethernet Segment (ES).
   In addition, the ability to influence the DF election result for a
   VLAN based on the state of the associated Attachment Circuit (AC) is
   specified.  This document clarifies the DF election Finite State
   Machine in EVPN services.  Therefore, it updates the EVPN
   specification (RFC 7432).

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8584.

Rabadan, et al.              Standards Track                    [Page 1]
RFC 8584         DF Election Framework for EVPN Services      April 2019

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................3
      1.1. Conventions and Terminology ................................3
      1.2. Default Designated Forwarder (DF) Election in EVPN
           Services ...................................................5
      1.3. Problem Statement ..........................................8
           1.3.1. Unfair Load Balancing and Service Disruption ........8
           1.3.2. Traffic Black-Holing on Individual AC Failures .....10
      1.4. The Need for Extending the Default DF Election in
           EVPN Services .............................................12
   2. Designated Forwarder Election Protocol and BGP Extensions ......13
      2.1. The DF Election Finite State Machine (FSM) ................13
      2.2. The DF Election Extended Community ........................16
           2.2.1. Backward Compatibility .............................19
   3. The Highest Random Weight DF Election Algorithm ................19
      3.1. HRW and Consistent Hashing ................................20
      3.2. HRW Algorithm for EVPN DF Election ........................20
   4. The AC-Influenced DF Election Capability .......................22
      4.1. AC-Influenced DF Election Capability for
           VLAN-Aware Bundle Services ................................24
   5. Solution Benefits ..............................................25
   6. Security Considerations ........................................26
   7. IANA Considerations ............................................27
   8. References .....................................................28
      8.1. Normative References ......................................28
      8.2. Informative References ....................................29
   Acknowledgments ...................................................30
   Contributors ......................................................30
   Authors' Addresses ................................................31

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