AC-influenced Designated Forwarder Election for (PBB-)EVPN
draft-rabadan-bess-evpn-ac-df-00

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Document Type Active Internet-Draft (individual)
Authors Jorge Rabadan  , Kiran Nagaraj  , Senthil Sathappan  , Wim Henderickx 
Last updated 2014-10-24
Replaced by draft-ietf-bess-evpn-ac-df
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BESS Workgroup                                                J. Rabadan
Internet Draft                                                K. Nagaraj
                                                            S. Sathappan
Intended status: Standards Track                           W. Henderickx
                                                          Alcatel-Lucent

Expires: April 27, 2015                                 October 24, 2014

       AC-influenced Designated Forwarder Election for (PBB-)EVPN
                    draft-rabadan-bess-evpn-ac-df-00

Abstract

   The Designated Forwarder (DF) in (PBB-)EVPN networks is the PE
   responsible for sending multicast, broadcast and unknown unicast
   traffic to a multi-homed CE, on a given Ethernet Tag on a particular
   Ethernet Segment (ES). The DF is selected based on the list of PEs
   that advertise the Ethernet Segment Identifier (ESI) to the EVPN
   network. While PE node or link failures trigger the DF re-election
   for a given <ESI, EVI>, individual Attachment Circuit (AC) or MAC-VRF
   failures do not trigger such DF re-election and the traffic may
   therefore be permanently impacted, even though there is an
   alternative path. This document improves the DF election algorithm so
   that the AC status can influence the result of the election and this
   type of "logical" failures can be protected too.

Status of this Memo

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Table of Contents

   1. Problem Statement . . . . . . . . . . . . . . . . . . . . . . .  2
   2. Solution description  . . . . . . . . . . . . . . . . . . . . .  4
     2.1. AC-influenced DF Election for EVPN  . . . . . . . . . . . .  4
       2.1.1. Current DF election procedure and AC failures . . . . .  5
       2.1.2. The Attachment Circuit (AC) influenced DF election  . .  6
     2.2. AC-influenced DF Election for PBB-EVPN  . . . . . . . . . .  7
       2.2.1. Current DF election procedure and AC failures . . . . .  8
       2.2.2. BGP encoding for advertising ACS per <ESI, ISID>  . . .  9
       2.2.3. The AC-influenced DF Election . . . . . . . . . . . . . 10
   3. Solution benefits . . . . . . . . . . . . . . . . . . . . . . . 11
   4. Conventions used in this document . . . . . . . . . . . . . . . 11
   5. Security Considerations . . . . . . . . . . . . . . . . . . . . 11
   6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 12
   7. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     7.1. Normative References  . . . . . . . . . . . . . . . . . . . 12
     7.2. Informative References  . . . . . . . . . . . . . . . . . . 12
   8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 12
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12

1. Problem Statement

   [EVPN] defines the Designated Forwarder (DF) as the (PBB-)EVPN PE
   responsible for:
 

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   o Flooding Broadcast, Unknown unicast and Multicast traffic (BUM), on
     a given Ethernet Tag on a particular Ethernet Segment (ES), to the
     CE. This is valid for single-active and all-active EVPN
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