Preference-based EVPN DF Election
draft-ietf-bess-evpn-pref-df-05

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Last updated 2019-12-17
Replaces draft-rabadan-bess-evpn-pref-df
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BESS Workgroup                                           J. Rabadan, Ed.
Internet-Draft                                              S. Sathappan
Intended status: Standards Track                                   Nokia
Expires: June 19, 2020                                     T. Przygienda
                                                                  W. Lin
                                                                J. Drake
                                                        Juniper Networks
                                                              A. Sajassi
                                                              S. Mohanty
                                                           Cisco Systems
                                                       December 17, 2019

                   Preference-based EVPN DF Election
                    draft-ietf-bess-evpn-pref-df-05

Abstract

   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.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

Rabadan, et al.           Expires June 19, 2020                 [Page 1]
Internet-Draft      Preference-based EVPN DF Election      December 2019

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on June 19, 2020.

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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Problem Statement . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Solution requirements . . . . . . . . . . . . . . . . . .   3
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . .   4
   3.  EVPN BGP Attributes Extensions  . . . . . . . . . . . . . . .   5
   4.  Solution description  . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Use of the Preference algorithm . . . . . . . . . . . . .   7
     4.2.  Use of the Preference algorithm in [RFC7432] Ethernet
           Segments  . . . . . . . . . . . . . . . . . . . . . . . .   9
     4.3.  The Non-Revertive Capability  . . . . . . . . . . . . . .  10
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  13
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  13
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

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