The BGP Tunnel Encapsulation Attribute
draft-ietf-idr-tunnel-encaps-07

Document Type Active Internet-Draft (idr WG)
Last updated 2017-10-20 (latest revision 2017-07-17)
Replaces draft-rosen-idr-tunnel-encaps, draft-vandevelde-idr-remote-next-hop
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IDR Working Group                                          E. Rosen, Ed.
Internet-Draft                                    Juniper Networks, Inc.
Obsoletes: 5512 (if approved)                                   K. Patel
Intended status: Standards Track                                  Arrcus
Expires: January 18, 2018                                G. Van de Velde
                                                                   Nokia
                                                           July 17, 2017

                 The BGP Tunnel Encapsulation Attribute
                    draft-ietf-idr-tunnel-encaps-07

Abstract

   RFC 5512 defines a BGP Path Attribute known as the "Tunnel
   Encapsulation Attribute".  This attribute allows one to specify a set
   of tunnels.  For each such tunnel, the attribute can provide the
   information needed to create the tunnel and the corresponding
   encapsulation header.  The attribute can also provide information
   that aids in choosing whether a particular packet is to be sent
   through a particular tunnel.  RFC 5512 states that the attribute is
   only carried in BGP UPDATEs that have the "Encapsulation Subsequent
   Address Family (Encapsulation SAFI)".  This document deprecates the
   Encapsulation SAFI (which has never been used in production), and
   specifies semantics for the attribute when it is carried in UPDATEs
   of certain other SAFIs.  This document adds support for additional
   tunnel types, and allows a remote tunnel endpoint address to be
   specified for each tunnel.  This document also provides support for
   specifying fields of any inner or outer encapsulations that may be
   used by a particular tunnel.

   This document obsoletes RFC 5512.

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
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   material or to cite them other than as "work in progress."

Rosen, et al.           Expires January 18, 2018                [Page 1]
Internet-Draft       Tunnel Encapsulation Attribute            July 2017

   This Internet-Draft will expire on January 18, 2018.

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Brief Summary of RFC 5512 . . . . . . . . . . . . . . . .   4
     1.2.  Deficiencies in RFC 5512  . . . . . . . . . . . . . . . .   4
     1.3.  Brief Summary of Changes from RFC 5512  . . . . . . . . .   5
     1.4.  Impact on RFC 5566  . . . . . . . . . . . . . . . . . . .   6
   2.  The Tunnel Encapsulation Attribute  . . . . . . . . . . . . .   6
   3.  Tunnel Encapsulation Attribute Sub-TLVs . . . . . . . . . . .   8
     3.1.  The Remote Endpoint Sub-TLV . . . . . . . . . . . . . . .   8
     3.2.  Encapsulation Sub-TLVs for Particular Tunnel Types  . . .  10
       3.2.1.  VXLAN . . . . . . . . . . . . . . . . . . . . . . . .  11
       3.2.2.  VXLAN-GPE . . . . . . . . . . . . . . . . . . . . . .  12
       3.2.3.  NVGRE . . . . . . . . . . . . . . . . . . . . . . . .  13
       3.2.4.  L2TPv3  . . . . . . . . . . . . . . . . . . . . . . .  14
       3.2.5.  GRE . . . . . . . . . . . . . . . . . . . . . . . . .  15
       3.2.6.  MPLS-in-GRE . . . . . . . . . . . . . . . . . . . . .  15
     3.3.  Outer Encapsulation Sub-TLVs  . . . . . . . . . . . . . .  16
       3.3.1.  IPv4 DS Field . . . . . . . . . . . . . . . . . . . .  16
       3.3.2.  UDP Destination Port  . . . . . . . . . . . . . . . .  17
     3.4.  Sub-TLVs for Aiding Tunnel Selection  . . . . . . . . . .  17
       3.4.1.  Protocol Type Sub-TLV . . . . . . . . . . . . . . . .  17
       3.4.2.  Color Sub-TLV . . . . . . . . . . . . . . . . . . . .  17
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