EVPN multi-homing port-active load-balancing
draft-ietf-bess-evpn-mh-pa-00

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Last updated 2020-02-17
Replaces draft-brissette-bess-evpn-mh-pa
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BESS Working Group                                     P. Brissette, Ed.
Internet-Draft                                                A. Sajassi
Intended status: Standards Track                           Cisco Systems
Expires: August 20, 2020                                          B. Wen
                                                                 Comcast
                                                               E. Leyton
                                                        Verizon Wireless
                                                              J. Rabadan
                                                                   Nokia
                                                               L. Burdet
                                                               S. Thoria
                                                           Cisco Systems
                                                       February 17, 2020

              EVPN multi-homing port-active load-balancing
                     draft-ietf-bess-evpn-mh-pa-00

Abstract

   The Multi-Chassis Link Aggregation Group (MC-LAG) technology enables
   the establishment of a logical link-aggregation connection with a
   redundant group of independent nodes.  The purpose of multi-chassis
   LAG is to provide a solution to achieve higher network availability,
   while providing different modes of sharing/balancing of traffic.
   EVPN standard defines EVPN based MC-LAG with single-active and all-
   active multi-homing load-balancing mode.  The current draft expands
   on existing redundancy mechanisms supported by EVPN and introduces
   support of port-active load-balancing mode.  In the current document,
   port-active load-balancing mode is also referred to as per interface
   active/standby.

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
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   This Internet-Draft will expire on August 20, 2020.

Brissette, et al.        Expires August 20, 2020                [Page 1]
Internet-Draft             EVPN MH Port-Active             February 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Multi-Chassis Ethernet Bundles  . . . . . . . . . . . . . . .   4
   3.  Port-active load-balancing procedure  . . . . . . . . . . . .   4
   4.  Algorithm to elect per port-active PE . . . . . . . . . . . .   5
     4.1.  Capability Flag . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Modulo-based Designated Forwarder Algorithm . . . . . . .   6
     4.3.  HRW Algorithm . . . . . . . . . . . . . . . . . . . . . .   6
     4.4.  Preferred-DF Algorithm  . . . . . . . . . . . . . . . . .   6
   5.  Convergence considerations  . . . . . . . . . . . . . . . . .   6
     5.1.  Primary / Backup per Ethernet-Segment . . . . . . . . . .   7
     5.2.  Backward Compatibility  . . . . . . . . . . . . . . . . .   7
   6.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .   7
   7.  Overall Advantages  . . . . . . . . . . . . . . . . . . . . .   8
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     10.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   EVPN, as per [RFC7432], provides all-active per flow load balancing
   for multi-homing.  It also defines single-active with service carving
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