Fast Recovery for EVPN DF Election
draft-ietf-bess-evpn-fast-df-recovery-01

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Last updated 2020-03-09
Replaces draft-sajassi-bess-evpn-fast-df-recovery
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BESS Working Group                                       A. Sajassi, Ed.
Internet-Draft                                                 G. Badoni
Intended status: Standards Track                                  D. Rao
Expires: September 10, 2020                                 P. Brissette
                                                                   Cisco
                                                                J. Drake
                                                                 Juniper
                                                              J. Rabadan
                                                                   Nokia
                                                           March 9, 2020

                   Fast Recovery for EVPN DF Election
                draft-ietf-bess-evpn-fast-df-recovery-01

Abstract

   Ethernet Virtual Private Network (EVPN) solution [RFC7432] describes
   DF election procedures for multi-homing Ethernet Segments.  These
   procedures are enhanced further in [RFC8584] 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 [RFC8584] 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 in full conformance with the
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   This Internet-Draft will expire on September 10, 2020.

Sajassi, et al.        Expires September 10, 2020               [Page 1]
Internet-Draft     Fast Recovery for EVPN DF Election         March 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Challenges with Existing Solution . . . . . . . . . . . . . .   3
     2.1.  Overview of Proposed Solutions  . . . . . . . . . . . . .   5
   3.  DF Election Handshake Solution  . . . . . . . . . . . . . . .   5
     3.1.  Discovery . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  DF Candidates Determination . . . . . . . . . . . . . . .   6
     3.3.  DF Election Handshake . . . . . . . . . . . . . . . . . .   6
     3.4.  Node Insertion  . . . . . . . . . . . . . . . . . . . . .   7
     3.5.  BGP Encoding  . . . . . . . . . . . . . . . . . . . . . .   8
       3.5.1.  DF Election Handshake Request Route . . . . . . . . .   8
       3.5.2.  DF Election Handshake Response Route  . . . . . . . .   8
     3.6.  DF Handshake Scenarios  . . . . . . . . . . . . . . . . .  10
     3.7.  Backwards Compatibility . . . . . . . . . . . . . . . . .  12
   4.  DF Election Synchronization Solution  . . . . . . . . . . . .  13
     4.1.  Advantages  . . . . . . . . . . . . . . . . . . . . . . .  14
     4.2.  BGP Encoding  . . . . . . . . . . . . . . . . . . . . . .  14
     4.3.  Note on NTP-based synchronization . . . . . . . . . . . .  15
     4.4.  Synchronization Scenarios . . . . . . . . . . . . . . . .  15
     4.5.  Backwards Compatibility . . . . . . . . . . . . . . . . .  16
   5.  Interoperability  . . . . . . . . . . . . . . . . . . . . . .  17
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  17
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  18
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