Preference-based EVPN DF Election
draft-rabadan-bess-evpn-pref-df-02

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Last updated 2016-12-19
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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: June 22, 2017                                 December 19, 2016

                   Preference-based EVPN DF Election
                   draft-rabadan-bess-evpn-pref-df-02

Abstract

   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.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
 

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on June 22, 2017.

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   Copyright (c) 2016 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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Table of Contents

   1. Problem Statement . . . . . . . . . . . . . . . . . . . . . . .  3
   2. Solution requirements . . . . . . . . . . . . . . . . . . . . .  3
   3. EVPN BGP Attributes for Deterministic DF Election . . . . . . .  4
   4. Solution description  . . . . . . . . . . . . . . . . . . . . .  5
     4.1 Use of the Preference algorithm  . . . . . . . . . . . . . .  5
     4.2 Use of the Preference algorithm in RFC7432
         Ethernet-Segments  . . . . . . . . . . . . . . . . . . . . .  7
     4.3 The Non-Revertive option . . . . . . . . . . . . . . . . . .  7
   5. Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . 10
 

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   11. Conventions used in this document  . . . . . . . . . . . . . . 10
   12. Security Considerations  . . . . . . . . . . . . . . . . . . . 10
   13. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 11
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