[Idr] Fwd: I-D Action: draft-dunbar-idr-metadata-subscription-control-00.txt

[Robert Raszuk <[e-mail]>]

Hi Linda,

Reading this draft I am very confused on the contradicting statements:

3.  Summary of Operation

   An ingress node that wishes to receive service metadata for routes
   tagged with particular Route Targets (RTs) signals its interest by
   advertising one or more MDS NLRI (AFI=IPv4/IPv6, SAFI=TBD-MDS) that
   identify the relevant RTs.

vs

8.  Relationship to RTC (RFC 4684)

   RTC [RFC4684] constrains which routes are propagated to a peer based
   on the RTs that the peer has expressed interest in.  Metadata
   Subscription (MDS) applies a complementary control: it determines
   whether service metadata is included when those routes are
   advertised.  Thus, RTC governs propagation of reachability
   information, while MDS governs propagation of associated service
   metadata.  Both mechanisms may be deployed together.

*Discussion:*

If section 3 is correct then RTC as defined today is all what is needed.

Now I am guessing that what you are trying to do here is to express an
additional signalling in this new SAFI if UPDATE messages containing RTs
signalled by RTC should also carry metadata or not.

But you can easily accomplish that goal by defining a new set of RTs (even
different by one bit) and signal it with RTC.

So why do we need a new SAFI.

*Side comment: *

When I read the first sentence of the Abstract: "   This document specifies
a receiver-driven _Metadata Subscription_ (MDS) mechanism for BGP."  I was
hoping to see actual subscription proposal turning BGP into PUB-SUB for
specific metadata types.

But reading on the text let me down :)

Best,
R.

-------- Forwarded message ---------
From: <[e-mail]>
Date: Wed, Dec 3, 2025 at 10:53 PM
Subject: I-D Action: draft-dunbar-idr-metadata-subscription-control-00.txt
To: <[e-mail]>


Internet-Draft draft-dunbar-idr-metadata-subscription-control-00.txt is now
available.

   Title:   Metadata Constrained Distribution
   Authors: Linda Dunbar
            Alvaro Retana
            Keyur Patel
            Kausik Majumdar
   Name:    draft-dunbar-idr-metadata-subscription-control-00.txt
   Pages:   11
   Dates:   2025-12-03

Abstract:

   This document specifies a receiver-driven _Metadata Subscription_
   (MDS) mechanism for BGP.  A BGP speaker uses the new MDS NLRI to
   subscribe to specific service metadata attributes.

The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-dunbar-idr-metadata-subscription-control/

There is also an HTMLized version available at:
https://datatracker.ietf.org/doc/html/draft-dunbar-idr-metadata-subscription-control-00

Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts


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