The BGP Tunnel Encapsulation Attribute
draft-ietf-idr-tunnel-encaps-20
| The information below is for an old version of the document | |||
|---|---|---|---|
| Document | Type | Active Internet-Draft (idr WG) | |
| Authors | Keyur Patel , Gunter Van de Velde , Srihari Sangli , John Scudder | ||
| Last updated | 2020-12-03 (latest revision 2020-11-10) | ||
| Replaces | draft-vandevelde-idr-remote-next-hop, draft-rosen-idr-tunnel-encaps | ||
| Stream | Internent Engineering Task Force (IETF) | ||
| Formats | pdf htmlized (tools) htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Susan Hares | ||
| Shepherd write-up | Show (last changed 2020-11-13) | ||
| IESG | IESG state | IESG Evaluation::Revised I-D Needed | |
| Consensus Boilerplate | Yes | ||
| Telechat date |
Has enough positions to pass. |
||
| Responsible AD | Alvaro Retana | ||
| Send notices to | John Scudder <jgs@juniper.net>, aretana.ietf@gmail.com, Susan Hares <shares@ndzh.com> | ||
| IANA | IANA review state | IANA OK - Actions Needed | |
IDR Working Group K. Patel
Internet-Draft Arrcus, Inc
Obsoletes: 5512, 5566, 5640 (if G. Van de Velde
approved) Nokia
Intended status: Standards Track S. Sangli
Expires: May 14, 2021 J. Scudder
Juniper Networks
November 10, 2020
The BGP Tunnel Encapsulation Attribute
draft-ietf-idr-tunnel-encaps-20
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 use 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. Since RFCs 5566 and 5640 rely on
RFC 5512, they are likewise obsoleted.
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
Patel, et al. Expires May 14, 2021 [Page 1]
Internet-Draft Tunnel Encapsulation Attribute November 2020
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 May 14, 2021.
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
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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. Use Case for The Tunnel Encapsulation Attribute . . . . . 5
1.4. Brief Summary of Changes from RFC 5512 . . . . . . . . . 6
1.5. Effects of Obsoleting RFCs 5566 and 5640 . . . . . . . . 7
2. The Tunnel Encapsulation Attribute . . . . . . . . . . . . . 8
3. Tunnel Encapsulation Attribute Sub-TLVs . . . . . . . . . . . 9
3.1. The Tunnel Egress Endpoint Sub-TLV . . . . . . . . . . . 9
3.1.1. Validating the Address Field . . . . . . . . . . . . 11
3.2. Encapsulation Sub-TLVs for Particular Tunnel Types . . . 12
3.2.1. VXLAN . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2.2. NVGRE . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2.3. L2TPv3 . . . . . . . . . . . . . . . . . . . . . . . 16
3.2.4. GRE . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2.5. MPLS-in-GRE . . . . . . . . . . . . . . . . . . . . . 17
3.3. Outer Encapsulation Sub-TLVs . . . . . . . . . . . . . . 17
3.3.1. DS Field . . . . . . . . . . . . . . . . . . . . . . 18
3.3.2. UDP Destination Port . . . . . . . . . . . . . . . . 18
3.4. Sub-TLVs for Aiding Tunnel Selection . . . . . . . . . . 18
3.4.1. Protocol Type Sub-TLV . . . . . . . . . . . . . . . . 19
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