[dtn] Re: I-D Action: draft-ietf-dtn-bp-sand-03.txt

[Brian Sipos <[e-mail]>]

WG,
This update to BP SAND refreshes the liveliness of this WG document and it
also addresses two structural issues in earlier versions:
1. The earlier one-map-per-message structure of `sand-msg` relied on the
sender to encode in deterministic key order for the message type to be at
the top of the message, which is not an easy guarantee with some CBOR
libraries. The new `sand-msg` as sequence ensures that the message type is
the first item in the sequence and guarantees decoders a way to distinguish
messages.
2. Most of the message types involved a single top-level "List of XXX" data
item mixed in with the message metadata. The new `sand-msg` sequence
separates the metadata map from one or more message data maps with distinct
label domains of metadata and message-type-specific data. This makes the
decoder's job easier and makes the parameter registries simpler at the same
time.

There are still some editorial issues and scoping questions to work out for
this document, and some TBDs remain. The capabilities between -02 and -03
are roughly unchanged even though the encodings have been updated. Status
will also be discussed at the upcoming IETF this month.

Brian S.

On Mon, Jul 6, 2026 at 5:26 PM <[e-mail]> wrote:

> Internet-Draft draft-ietf-dtn-bp-sand-03.txt is now available. It is a work
> item of the Delay/Disruption Tolerant Networking (DTN) WG of the IETF.
>
>    Title:   Bundle Protocol (BP) Secure Advertisement and Neighborhood
> Discovery (SAND)
>    Authors: Brian Sipos
>             Joshua Deaton
>    Name:    draft-ietf-dtn-bp-sand-03.txt
>    Pages:   75
>    Dates:   2026-07-06
>
> Abstract:
>
>    This document defines the Secure Advertisement and Neighborhood
>    Discovery (SAND) protocol for Bundle Protocol version 7 (BPv7) within
>    a delay-tolerant network (DTN).  This protocol defines a general
>    purpose advertisement mechanism with an initial set of message and
>    data types able to be advertised by participating nodes in a BPv7
>    network.  The focus of this document is for advertisement to
>    topological neighbors about local neighborhoods but can be expanded
>    upon in the future through extension points.
>
> The IETF datatracker status page for this Internet-Draft is:
> https://datatracker.ietf.org/doc/draft-ietf-dtn-bp-sand/
>
> There is also an HTML version available at:
> https://www.ietf.org/archive/id/draft-ietf-dtn-bp-sand-03.html
>
> A diff from the previous version is available at:
> https://author-tools.ietf.org/iddiff?url2=draft-ietf-dtn-bp-sand-03
>
> Internet-Drafts are also available by rsync at:
> rsync.ietf.org::internet-drafts
>
>
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