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

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Last updated 2018-09-19
Replaces draft-malhotra-bess-evpn-unequal-lb
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INTERNET-DRAFT                                          N. Malhotra, Ed.
                                                                  Arrcus
                                                              A. Sajassi
Intended Status: Proposed Standard                                 Cisco
                                                              J. Rabadan
                                                                   Nokia
                                                                J. Drake
                                                                 Juniper
                                                              A. Lingala
                                                                    AT&T
                                                               S. Thoria
                                                                   Cisco

Expires: March 23, 2019                               September 19, 2018

    Weighted Multi-Path Procedures for EVPN All-Active Multi-Homing
                   draft-ietf-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

       This Internet-Draft is submitted to IETF in full conformance with
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       Internet-Drafts are working documents of the Internet Engineering
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Malhotra et al.          Expires March 23, 2019                 [Page 1]
INTERNET DRAFT         EVPN Unequal Multi-Pathing     September 19, 2018

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Copyright and License Notice

       Copyright (c) 2017 IETF Trust and the persons identified as the
       document authors. All rights reserved.

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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1 PE CE Link Provisioning  . . . . . . . . . . . . . . . . . .  5
     1.2 PE CE Link Failures  . . . . . . . . . . . . . . . . . . . .  6
     1.3 Design Requirement . . . . . . . . . . . . . . . . . . . . .  7
     1.4  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  7
   2. Solution Overview . . . . . . . . . . . . . . . . . . . . . . .  8
   3.  Weighted Unicast Traffic Load-balancing  . . . . . . . . . . .  8
     3.1 LOCAL PE Behavior  . . . . . . . . . . . . . . . . . . . . .  8
     3.1 Link Bandwidth Extended Community  . . . . . . . . . . . . .  8
     3.2 REMOTE PE Behavior . . . . . . . . . . . . . . . . . . . . .  9
   4.  Weighted BUM Traffic Load-Sharing  . . . . . . . . . . . . . . 10
     4.1  The BW Capability in the DF Election Extended Community . . 10
     4.2  BW Capability and Default DF Election algorithm . . . . . . 11
     4.3  BW Capability and HRW DF Election algorithm (Type 1 and
          4)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
       4.3.1 BW Increment . . . . . . . . . . . . . . . . . . . . . . 11
       4.3.2 HRW Hash Computations with BW Increment  . . . . . . . . 12
       4.3.3 Cost-Benefit Tradeoff on Link Failures . . . . . . . . . 13
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