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

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INTERNET-DRAFT                                         Patrice Brissette
Intended Status: Proposed Standard                          Samir Thoria
                                                           Cisco Systems
                                                                        
Expires: May 3, 2018                                    October 30, 2017

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

Abstract

   The Multi-Chassis Link Aggregation Group (MC-LAG) technology enables
   the establishment of a logical port-channel 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.
   [RFC7432] 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 draft,
   port-active load-balancing mode is also referred to as per interface
   active/standby.

Status of this Memo

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Copyright and License Notice
 

Patrice Brissette         Expires May 3, 2018                   [Page 1]
INTERNET DRAFT      draft-brissette-bess-evpn-mh-pa     October 30, 2017

   Copyright (c) 2017 IETF Trust and the persons identified as the
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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  4
   2. Port-active load-balancing procedure  . . . . . . . . . . . . .  4
   3. Algorithm to elect per port-active PE . . . . . . . . . . . . .  5
   4. Applicability . . . . . . . . . . . . . . . . . . . . . . . . .  5
   5. Advantages  . . . . . . . . . . . . . . . . . . . . . . . . . .  6
   6  Security Considerations . . . . . . . . . . . . . . . . . . . .  7
   7  IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  7
   8  References  . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     8.1  Normative References  . . . . . . . . . . . . . . . . . . .  7
     8.2  Informative References  . . . . . . . . . . . . . . . . . .  7
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  7

 

Patrice Brissette         Expires May 3, 2018                   [Page 2]
INTERNET DRAFT      draft-brissette-bess-evpn-mh-pa     October 30, 2017

1  Introduction

   EVPN, as per [RFC 7432], currently provides all-active per flow load
   balancing for multi-homing. It also defines single-active with
   service carving mode, where one of the PEs in redundancy relationship
   is active per service.  

   While these two multi-homing scenarios are most widely utilized in
   data center and service provider access networks, there are scenarios
   where active-standby per interface multi-homing redundancy is useful
   and required. Main consideration for this mode of redundancy is the
   determinism of traffic forwarding through specific interface rather
   than statistical per flow load balancing across multiple PEs
   providing multi-homing. The determinism provided by active-standby
   per interface is also required for certain QOS features to work.
   While using this mode customer also expect minimized convergence
   during failures. A new term of load-balancing mode "port-active load-
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