Weighted Multi-Path Procedures for EVPN All-Active Multi-Homing
draft-malhotra-bess-evpn-unequal-lb-00

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Document Type Active Internet-Draft (individual)
Authors Neeraj Malhotra  , Samir Thoria  , Ali Sajassi  , Avinash Lingala 
Last updated 2017-10-30
Replaced by draft-ietf-bess-evpn-unequal-lb
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INTERNET-DRAFT                                          N. Malhotra, Ed.
                                                               S. Thoria
                                                              A. Sajassi
Intended Status: Proposed Standard                               (Cisco)
                                                              A. Lingala
                                                                  (AT&T)

Expires: May 3, 2018                                    October 30, 2017

    Weighted Multi-Path Procedures for EVPN All-Active Multi-Homing
                 draft-malhotra-bess-evpn-unequal-lb-00

Abstract

   In an EVPN-IRB based network overlay, EVPN LAG enables all-active
   multi-homing for a host or CE device connected to two or more PEs via
   a LAG bundle, such that bridged and routed traffic from remote PEs
   can be equally load balanced (ECMPed) across the multi-homing PEs.
   This document defines extensions to EVPN procedures to optimally
   handle unequal access bandwidth distribution across a set of multi-
   homing PEs in order to:

     o provide greater flexibility, with respect to adding or
       removing individual PE-CE links within the access LAG

     o handle PE-CE LAG member link failures that can result in unequal
       PE-CE access bandwidth across a set of multi-homing PEs

Status of this Memo

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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1 PE CE Link Provisioning  . . . . . . . . . . . . . . . . . .  4
     1.2 PE CE Link Failures  . . . . . . . . . . . . . . . . . . . .  5
     1.3 Design Requirement . . . . . . . . . . . . . . . . . . . . .  6
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  6
   2. Solution Overview . . . . . . . . . . . . . . . . . . . . . . .  6
   3.  Weighted Unicast Traffic Load-balancing  . . . . . . . . . . .  7
     3.1 LOCAL PE Behavior  . . . . . . . . . . . . . . . . . . . . .  7
     3.2 REMOTE PE Behavior . . . . . . . . . . . . . . . . . . . . .  7
   4.  Weighted BUM Traffic Load-Sharing  . . . . . . . . . . . . . .  8
   5. Routed EVPN Overlay . . . . . . . . . . . . . . . . . . . . . .  8
   6. EVPN-IRB Multi-homing with non-EVPN routing . . . . . . . . . .  9
   7.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     7.1  Normative References  . . . . . . . . . . . . . . . . . . . 10
     7.2  Informative References  . . . . . . . . . . . . . . . . . . 10
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 10
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 10

 

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1  Introduction

   In an EVPN-IRB based network overlay, with access an access CE multi-
   homed via a LAG interface, bridged and routed traffic from remote PEs
   can be equally load balanced (ECMPed) across the multi-homing PEs:

     o ECMP Load-balancing for bridged unicast traffic is enabled via  
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