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

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Last updated 2017-03-13
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BESS Working Group                                           Ali Sajassi
Internet-Draft                                             Gaurav Badoni
Intended Status: Standards Track                          Dhananjaya Rao
                                                       Patrice Brissette
                                                                   Cisco
                                                              John Drake
                                                                 Juniper
                                                                        
Expires: September 12, 2017                               March 12, 2017

                   Fast Recovery for EVPN DF Election
              draft-sajassi-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 [EVPN-DF-Election] 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 [EVPN-DF-Election] 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

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Sajassi et al.         Expires September 12, 2017               [Page 1]
INTERNET DRAFT     Fast Recovery for EVPN DF Election     March 12, 2017

   The list of Internet-Draft Shadow Directories can be accessed at
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Copyright and License Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
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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 . . . . . . . . . . . . . . . . . . . . .  7
       3.1.5 BGP Encoding . . . . . . . . . . . . . . . . . . . . . .  8
         3.1.5.1 DF Election Handshake Request Route  . . . . . . . .  8
         3.5.1.2 DF Election Handshake Response Route . . . . . . . .  9
       3.1.6 DF Handshake Scenarios . . . . . . . . . . . . . . . . . 10
       3.1.7  Interoperability  . . . . . . . . . . . . . . . . . . . 13
     3.2 DF Election Synchronization Solution . . . . . . . . . . . . 14
       3.2.3 Advantages . . . . . . . . . . . . . . . . . . . . . . . 15
       3.2.4 Interoperability . . . . . . . . . . . . . . . . . . . . 15
       3.2.5 BGP Encoding . . . . . . . . . . . . . . . . . . . . . . 15
       3.2.6 Note on NTP-based synchronization  . . . . . . . . . . . 16
       3.2.7 An example . . . . . . . . . . . . . . . . . . . . . . . 16
   4  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . . 17
   5  Security Considerations . . . . . . . . . . . . . . . . . . . . 17
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