Integrated Routing and Bridging in EVPN
draft-ietf-bess-evpn-inter-subnet-forwarding-09

Document Type Active Internet-Draft (bess WG)
Last updated 2020-07-07 (latest revision 2020-06-14)
Replaces draft-sajassi-l2vpn-evpn-inter-subnet-forwarding
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication
Document shepherd Zhaohui Zhang
Shepherd write-up Show (last changed 2020-07-07)
IESG IESG state IESG Evaluation
Consensus Boilerplate Yes
Telechat date On agenda of 2020-07-16 IESG telechat
Needs 9 more YES or NO OBJECTION positions to pass.
Responsible AD Martin Vigoureux
Send notices to "Zhaohui Zhang" <zzhang@juniper.net>
IANA IANA review state IANA OK - Actions Needed
BESS WorkGroup                                                A. Sajassi
Internet-Draft                                                  S. Salam
Intended status: Standards Track                               S. Thoria
Expires: December 16, 2020                                 Cisco Systems
                                                                J. Drake
                                                                 Juniper
                                                              J. Rabadan
                                                                   Nokia
                                                           June 14, 2020

                Integrated Routing and Bridging in EVPN
            draft-ietf-bess-evpn-inter-subnet-forwarding-09

Abstract

   EVPN provides an extensible and flexible multi-homing VPN solution
   over an MPLS/IP network for intra-subnet connectivity among Tenant
   Systems and End Devices that can be physical or virtual.  However,
   there are scenarios for which there is a need for a dynamic and
   efficient inter-subnet connectivity among these Tenant Systems and
   End Devices while maintaining the multi-homing capabilities of EVPN.
   This document describes an Integrated Routing and Bridging (IRB)
   solution based on EVPN to address such requirements.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119] and
   RFC 8174 [RFC8174].

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 16, 2020.

Sajassi, et al.         Expires December 16, 2020               [Page 1]
Internet-Draft   Integrated Routing and Bridging in EVPN       June 2020

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  EVPN PE Model for IRB Operation . . . . . . . . . . . . . . .   6
   4.  Symmetric and Asymmetric IRB  . . . . . . . . . . . . . . . .   7
     4.1.  IRB Interface and its MAC and IP addresses  . . . . . . .  10
   5.  Symmetric IRB Procedures  . . . . . . . . . . . . . . . . . .  12
     5.1.  Control Plane - Advertising PE  . . . . . . . . . . . . .  12
     5.2.  Control Plane - Receiving PE  . . . . . . . . . . . . . .  13
     5.3.  Subnet route advertisement  . . . . . . . . . . . . . . .  14
     5.4.  Data Plane - Ingress PE . . . . . . . . . . . . . . . . .  14
     5.5.  Data Plane - Egress PE  . . . . . . . . . . . . . . . . .  15
   6.  Asymmetric IRB Procedures . . . . . . . . . . . . . . . . . .  16
     6.1.  Control Plane - Advertising PE  . . . . . . . . . . . . .  16
     6.2.  Control Plane - Receiving PE  . . . . . . . . . . . . . .  16
     6.3.  Data Plane - Ingress PE . . . . . . . . . . . . . . . . .  18
     6.4.  Data Plane - Egress PE  . . . . . . . . . . . . . . . . .  18
   7.  Mobility Procedure  . . . . . . . . . . . . . . . . . . . . .  19
     7.1.  Initiating an ARP Request upon a Move . . . . . . . . . .  19
     7.2.  Sending Data Traffic without an ARP Request . . . . . . .  20
     7.3.  Silent Host . . . . . . . . . . . . . . . . . . . . . . .  22
   8.  BGP Encoding  . . . . . . . . . . . . . . . . . . . . . . . .  23
     8.1.  Router's MAC Extended Community . . . . . . . . . . . . .  23
   9.  Operational Models for Symmetric Inter-Subnet Forwarding  . .  24
     9.1.  IRB forwarding on NVEs for Tenant Systems . . . . . . . .  24
       9.1.1.  Control Plane Operation . . . . . . . . . . . . . . .  25
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