Integrated Routing and Bridging in EVPN
draft-ietf-bess-evpn-inter-subnet-forwarding-03

Document Type Active Internet-Draft (bess WG)
Last updated 2017-02-13 (latest revision 2017-02-10)
Replaces draft-sajassi-l2vpn-evpn-inter-subnet-forwarding
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state In WG Last Call
Document shepherd Zhaohui Zhang
IESG IESG state I-D Exists
Consensus Boilerplate Yes
Telechat date
Responsible AD (None)
Send notices to "Zhaohui Zhang" <zzhang@juniper.net>
L2VPN Workgroup                                          A. Sajassi, Ed.
INTERNET-DRAFT                                                  S. Salam
Intended Status: Standards Track                               S. Thoria
                                                                   Cisco
                                                                J. Drake
                                                                 Juniper
                                                              J. Rabadan
                                                                   Nokia
                                                                 L. Yong
                                                                  Huawei
                                                                        
Expires: August 8, 2017                                 February 8, 2017

                Integrated Routing and Bridging in EVPN 
            draft-ietf-bess-evpn-inter-subnet-forwarding-03 

Abstract

   EVPN provides an extensible and flexible multi-homing VPN solution
   for intra-subnet connectivity among hosts/VMs over an MPLS/IP
   network. However, there are scenarios in which inter-subnet
   forwarding among hosts/VMs across different IP subnets is required,
   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. 

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
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Sajassi et al.           Expires August 8, 2017                 [Page 1]
INTERNET DRAFT   Integrated Routing & Bridging in EVPN     March 4, 2016

   http://www.ietf.org/shadow.html

Copyright and License Notice

   Copyright (c) 2014 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document. Please review these documents
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   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  5
   2  Inter-Subnet Forwarding Scenarios . . . . . . . . . . . . . . .  6
     2.1 Switching among IP subnets within a DC . . . . . . . . . . .  7
     2.2 Switching among IP subnets in different DCs without GW . . .  8
     2.3 Switching among IP subnets in different DCs with GW  . . . .  8
     2.4 Switching among IP subnets spread across IP-VPN and EVPN
         networks with GW . . . . . . . . . . . . . . . . . . . . . .  8
   3 Default L3 Gateway for Tenant System . . . . . . . . . . . . . .  9
     3.1 Homogeneous Environment  . . . . . . . . . . . . . . . . . .  9
     3.2 Heterogeneous Environment  . . . . . . . . . . . . . . . . . 10
   4  Operational Models for Asymmetric Inter-Subnet Forwarding . . . 10
     4.1 Among EVPN NVEs within a DC  . . . . . . . . . . . . . . . . 10
     4.2 Among EVPN NVEs in Different DCs Without GW  . . . . . . . . 11
     4.3 Among EVPN NVEs in Different DCs with GW . . . . . . . . . . 13
     4.4 Among IP-VPN Sites and EVPN NVEs with GW . . . . . . . . . . 14
     4.5 Use of Centralized Gateway . . . . . . . . . . . . . . . . . 15
   5 Operational Models for Symmetric Inter-Subnet Forwarding . . . . 16
     5.1 IRB forwarding on NVEs for Tenant Systems  . . . . . . . . . 16
       5.1.1 Control Plane Operation  . . . . . . . . . . . . . . . . 17
       5.1.2 Data Plane Operation - Inter Subnet  . . . . . . . . . . 18
       5.1.3 TS Move Operation  . . . . . . . . . . . . . . . . . . . 19
     5.2 IRB forwarding on NVEs for Subnets behind Tenant Systems . . 20
       5.2.1 Control Plane Operation  . . . . . . . . . . . . . . . . 22
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