The BGP Tunnel Encapsulation Attribute
draft-ietf-idr-tunnel-encaps-15
IDR Working Group K. Patel
Internet-Draft Arrcus, Inc
Obsoletes: 5512 (if approved) G. Van de Velde
Intended status: Standards Track Nokia
Expires: June 3, 2020 S. Sangli
Juniper Networks, Inc
December 01, 2019
The BGP Tunnel Encapsulation Attribute
draft-ietf-idr-tunnel-encaps-15.txt
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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Internet-Drafts are draft documents valid for a maximum of six months
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time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
Patel, et al. Expires June 3, 2020 [Page 1]
Internet-Draft Tunnel Encapsulation Attribute December 2019
This Internet-Draft will expire on June 3, 2020.
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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 Tunnel Endpoint Sub-TLV . . . . . . . . . . . . . . . 8
3.2. Encapsulation Sub-TLVs for Particular Tunnel Types . . . 10
3.2.1. VXLAN . . . . . . . . . . . . . . . . . . . . . . . . 10
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
3.2.7. IP-in-IP . . . . . . . . . . . . . . . . . . . . . . 16
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
3.5. Embedded Label Handling Sub-TLV . . . . . . . . . . . . . 18
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