Re: [Idr] I-D Action: draft-ietf-idr-tunnel-encaps-20.txt

John Scudder <jgs@juniper.net> Tue, 10 November 2020 21:20 UTC

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From: John Scudder <jgs@juniper.net>
To: "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Idr] I-D Action: draft-ietf-idr-tunnel-encaps-20.txt
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/MkQPOktdsUZAkxgv9iqtJgdG4HE>
Subject: Re: [Idr] I-D Action: draft-ietf-idr-tunnel-encaps-20.txt
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Hi All,

This version addresses reviews from OPSDIR, TSVART, GENART, and RTGDIR, as well as the document shepherd (Sue) and AD (Alvaro).

Many of the changes are editorial. Below I list those that aren’t:

- Removed VXLAN GPE from the document. This is because GPE is still in draft and would be a downref preventing publication of our doc. Since many documents are already blocked on publication of ours, and since GPE is evidently not expected to be published soon, it was considered better to pull it out into its own short draft. We’ll publish that one soon, and it can move along at whatever pace the GPE spec does.
- DS Field sub-TLV explicitly can transport any value.
- UDP Destination Port sub-TLV can’t contain port = 0 (which is a reserved value).
- Protocol sub-TLV can’t contain Ethertype = 0xFFFF (which is a reserved value).
- Embedded Label Handling sub-TLV can’t contain anything other than the defined values 0 or 1.
- Disclaimed any knowledge of what happens if you put Tunnel Encapsulation and PMSI attributes in the same route.
- Appendix A talking about RFC 8365 (especially since 8365 references draft-ietf-idr-tunnel-encaps!).

That’s about it I think.

—John

On Nov 10, 2020, at 4:03 PM, internet-drafts@ietf.org<mailto:internet-drafts@ietf.org> wrote:

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

       Title           : The BGP Tunnel Encapsulation Attribute
       Authors         : Keyur Patel
                         Gunter Van de Velde
                         Srihari R. Sangli
                         John Scudder
       Filename        : draft-ietf-idr-tunnel-encaps-20.txt
       Pages           : 46
       Date            : 2020-11-10

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.