EVPN Split Horizon Filtering Enhancement
draft-jiang-bess-evpn-split-horizon-enhancement-00

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Last updated 2020-06-03
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BESS Working Group                                            J. He, Ed.
Internet-Draft                                                    B. Nie
Intended status: Standards Track                                Ericsson
Expires: December 5, 2020                                   June 3, 2020

                EVPN Split Horizon Filtering Enhancement
           draft-jiang-bess-evpn-split-horizon-enhancement-00

Abstract

   Ethernet Virtual Private Network (EVPN) multi-homing accommodates
   load balance, link/node redundancy and fast convergence.  The split
   horizon filtering in EVPN avoids loop happens on multi-homed CE.
   However, this mechanism brings challenges switching chipsets on data
   plane.  This document describes an approach for the challenges by
   enhancing current split horizon filtering mechanism.  The advantage
   of this approach is that it simplifies data plane behaviors.

Status of This Memo

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   This Internet-Draft will expire on December 5, 2020.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Approach  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Advertising EVPN VRF Route Import Extended Community  . .   4
     4.2.  Constructing IMET Routes  . . . . . . . . . . . . . . . .   4
     4.3.  Flooding Handling on Data Plane . . . . . . . . . . . . .   5
   5.  EVPN VRF Route Import Extended Community  . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  EVPN VRF Route Import Extended Community  . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   Ethernet Virtual Private Network (EVPN) multi-homing accommodates
   load balance, link/node redundancy and fast convergence.  The split
   horizon filtering in EVPN avoids loop happens on multi-homed CE.  In
   particular, there are two split horizon filtering mechanisms to avoid
   looped frames on the multi-homed CE: ESI Label based [RFC7432] for
   MPLS based tunnels and Local Bias[RFC8365] for non-MPLS NVO tunnels,
   E.g.  VXLAN tunnels.

   However, each mechanism introduces challenges for data plane because
   extra logic is introduced but not available on some typical switching
   chipsets.  ESI Label based mechanism requires ingress PE to push ESI
   label into MPLS stack to indicate Ethernet Segment Identifier, and
   requires egress PE to filter out the corresponding port based on ESI
   label before flooding.  Local Bias does not require ingress PE to
   have extra procedure but still requires egress PE to filter out the
   corresponding ports based on source IP address before flooding.

   This document describes an approach towards the challenges, by
   enhancing current Local Bias split horizon filtering mechanism, for
   MPLS based tunnels and non-MPLS NVO tunnels.  The advantage of this
   approach is that it simplifies data plane behaviors.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP

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