Framework for EVPN Designated Forwarder Election Extensibility
draft-ietf-bess-evpn-df-election-framework-09

Document Type Active Internet-Draft (bess WG)
Last updated 2019-04-15 (latest revision 2019-01-24)
Replaces draft-ietf-bess-evpn-df-election, draft-ietf-bess-evpn-ac-df
Stream IETF
Intended RFC status Proposed Standard
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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 Ed Queue
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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
RFC Editor RFC Editor state AUTH48
BESS Workgroup                                           J. Rabadan, Ed.
Internet Draft                                                     Nokia
Updates: 7432                                            S. Mohanty, Ed.
Intended status: Standards Track                              A. Sajassi
                                                                   Cisco
                                                                J. Drake
                                                                 Juniper
                                                              K. Nagaraj
                                                            S. Sathappan
                                                                   Nokia

Expires: July 28, 2019                                  January 24, 2019

     Framework for EVPN Designated Forwarder Election Extensibility
             draft-ietf-bess-evpn-df-election-framework-09

Abstract

   An alternative to the Default Designated Forwarder (DF) selection
   algorithm in Ethernet VPN (EVPN) networks is defined. The DF is the
   Provider Edge (PE) router responsible for sending broadcast, unknown
   unicast and multicast (BUM) traffic to multi-homed Customer Equipment
   (CE) on a particular Ethernet Segment (ES) within a VLAN. In
   addition, the capability 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, therefore it updates the EVPN specification.

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), its areas, and its working groups.  Note that
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   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
 

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   material or to cite them other than as "work in progress."

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   This Internet-Draft will expire on July 28, 2019.

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   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  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1. Default Designated Forwarder (DF) Election in EVPN  . . . .  3
     1.2. Problem Statement . . . . . . . . . . . . . . . . . . . . .  6
       1.2.1. Unfair Load-Balancing and Service Disruption  . . . . .  6
       1.2.2. Traffic Black-Holing on Individual AC Failures  . . . .  7
     1.3. The Need for Extending the Default DF Election in EVPN  . . 10
   2. Conventions and Terminology . . . . . . . . . . . . . . . . . . 11
   3. Designated Forwarder Election Protocol and BGP Extensions . . . 12
     3.1. The DF Election Finite State Machine (FSM)  . . . . . . . . 12
     3.2. The DF Election Extended Community  . . . . . . . . . . . . 15
       3.2.1. Backward Compatibility  . . . . . . . . . . . . . . . . 18
     3.3. Auto-Derivation of ES-Import Route Target . . . . . . . . . 18
   4. The Highest Random Weight DF Election Algorithm . . . . . . . . 18
     4.1. HRW and Consistent Hashing  . . . . . . . . . . . . . . . . 19
     4.2. HRW Algorithm for EVPN DF Election  . . . . . . . . . . . . 19
   5. The Attachment Circuit Influenced DF Election Capability  . . . 21
     5.1. AC-Influenced DF Election Capability For VLAN-Aware
          Bundle Services . . . . . . . . . . . . . . . . . . . . . . 23
 

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   6. Solution Benefits . . . . . . . . . . . . . . . . . . . . . . . 24
   7. Security Considerations . . . . . . . . . . . . . . . . . . . . 25
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