Preference-based EVPN DF Election
draft-ietf-bess-evpn-pref-df-04

Document Type Active Internet-Draft (bess WG)
Last updated 2019-06-25
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

S. Boutros                                                 T. Przygienda
VMWare                                                            W. Lin
                                                                J. Drake
                                                        Juniper Networks

                                                              A. Sajassi
                                                              S. Mohanty
                                                           Cisco Systems

Expires: December 27, 2019                                 June 25, 2019

                   Preference-based EVPN DF Election
                    draft-ietf-bess-evpn-pref-df-04

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

 

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Table of Contents

   1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     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 
 

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         Segments . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     4.3 The Non-Revertive Capability . . . . . . . . . . . . . . . . 10
   5. Security Considerations . . . . . . . . . . . . . . . . . . . . 12
   6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 13
   7. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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