Fast Recovery for EVPN DF Election
draft-ietf-bess-evpn-fast-df-recovery-00

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BESS Working Group                                            A. Sajassi
Internet-Draft                                                 G. Badoni
Intended Status: Standards Track                                  D. Rao
                                                            P. Brissette
                                                                   Cisco
                                                                J. Drake
                                                                 Juniper
                                                              J. Rabadan
                                                                   Nokia
                                                                        
Expires: December 12, 2018                                 June 12, 2018

                   Fast Recovery for EVPN DF Election
               draft-ietf-bess-evpn-fast-df-recovery-00 

Abstract

   Ethernet Virtual Private Network (EVPN) solution [RFC 7432] describes
   DF election procedures for multi-homing Ethernet Segments. These
   procedures are enhanced further in [DF-FRAMEWORK] by applying Highest
   Random Weight Algorithm for DF election in order to avoid DF status
   unnecessarily upon a failure. This draft makes further improvement to
   DF election procedures in [DF-FRAMEWORK] by providing two options for
   fast DF election upon recovery of the failed link or node associated
   with the multi-homing Ethernet Segment. This fast DF election is
   achieved independent of number of EVIs associated with that Ethernet
   Segment and it is performed via a simple signaling between the
   recovered PE and each PE in the multi-homing group.      

Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   The list of current Internet-Drafts can be accessed at
 

Sajassi et al.         Expires December 12, 2018                [Page 1]
INTERNET DRAFT     Fast Recovery for EVPN DF Election      June 12, 2018

   http://www.ietf.org/1id-abstracts.html

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html

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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  4
   2  Challenges with Existing Solution . . . . . . . . . . . . . . .  4
   3 Operation  . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.1 DF Election Handshake Solution . . . . . . . . . . . . . . .  6
       3.1.1 Discovery  . . . . . . . . . . . . . . . . . . . . . . .  6
       3.1.2 DF candidates Determination  . . . . . . . . . . . . . .  6
       3.1.3 DF Election Handshake  . . . . . . . . . . . . . . . . .  7
       3.1.4 Node Insertion . . . . . . . . . . . . . . . . . . . . .  8
       3.1.5 BGP Encoding . . . . . . . . . . . . . . . . . . . . . .  8
         3.1.5.1 DF Election Handshake Request Route  . . . . . . . .  9
         3.5.1.2 DF Election Handshake Response Route . . . . . . . .  9
       3.1.6 DF Handshake Scenarios . . . . . . . . . . . . . . . . . 11
       3.1.7  Interoperability  . . . . . . . . . . . . . . . . . . . 13
     3.2 DF Election Synchronization Solution . . . . . . . . . . . . 14
       3.2.3 Advantages . . . . . . . . . . . . . . . . . . . . . . . 15
       3.2.4 Interoperability . . . . . . . . . . . . . . . . . . . . 16
       3.2.5 BGP Encoding . . . . . . . . . . . . . . . . . . . . . . 16
       3.2.6 Note on NTP-based synchronization  . . . . . . . . . . . 17
       3.2.7 An example . . . . . . . . . . . . . . . . . . . . . . . 17
   4  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . . 18