Re: [Isis-wg] I-D Action: draft-ietf-isis-segment-routing-msd-05.txt

Jeff -

The editorial revisions to the IANA section in V5 of the document seem very confusing to me.

<snip>
This document includes a request to IANA to allocate sub-TLV type
   codes for the new sub TLV proposed in Section 3 of this document from
   IS-IS Router Capability TLV Registry as defined by [RFC7981].

   Following values have been allocated by IANA:

      Value     Description                      Reference
      -----     ---------------                  -------------
      23        Node MSD                         This document
      15        Link MSD                         This document

                            Figure 3: MSD Types

   For the Link MSD, we request IANA to allocate new sub-TLV codes as
   defined in Section 4 from Sub-TLVs for TLVs 22, 23, 141, 222 and 223
   registry.

   Per TLV information where LINK MSD sub-TLV can be part of:

                     TLV  22 23 25 141 222 223
                          --------------------
                          y  y  y  y   y   y

           Figure 4: TLVs where LINK MSD Sub-TLV can be present
<end snip>

The revisions make it seem like both code points are associated with the Router Capability TLV. 
Here is a suggested revision:

<begin>
This document includes a request to IANA to allocate a sub-TLV type
   code for the Node MSD sub TLV proposed in Section 3 of this document from
   IS-IS Router Capability TLV Registry as defined by [RFC7981].

   The following value has been allocated by IANA:

      Value     Description                      Reference
      -----     ---------------                  -------------
      23        Node MSD                         This document

   This document also includes a request to IANA to allocate a sub-TLV type code
  for the Link MSD sub-TLV proposed in Section 4 of this document from the
  Sub-TLVs for TLVs 22, 23, 141, 222 and 223  registry.

   The following value has been allocated by IANA:

      Value     Description                      Reference
      -----     ---------------                  -------------
      15        Link MSD                         This document

   Per TLV information where LINK MSD sub-TLV can be part of:

                     TLV  22 23 25 141 222 223
                          --------------------
                          y  y  y  y   y   y

           Figure 3: TLVs where LINK MSD Sub-TLV can be present

<end>

   Les

> -----Original Message-----
> From: Isis-wg [mailto:isis-wg-bounces@ietf.org] On Behalf Of internet-
> drafts@ietf.org
> Sent: Wednesday, November 29, 2017 4:30 AM
> To: i-d-announce@ietf.org
> Cc: isis-wg@ietf.org
> Subject: [Isis-wg] I-D Action: draft-ietf-isis-segment-routing-msd-05.txt
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the IS-IS for IP Internets WG of the IETF.
> 
>         Title           : Signaling  MSD (Maximum SID Depth) using IS-IS
>         Authors         : Jeff Tantsura
>                           Uma Chunduri
>                           Sam Aldrin
>                           Les Ginsberg
> 	Filename        : draft-ietf-isis-segment-routing-msd-05.txt
> 	Pages           : 8
> 	Date            : 2017-11-29
> 
> Abstract:
>    This document proposes a way to signal Maximum SID Depth (MSD)
>    supported by a node at node and/or link granularity by an IS-IS
>    Router.  In a Segment Routing (SR) enabled network a centralized
>    controller that programs SR tunnels needs to know the MSD supported
>    by the head-end at node and/or link granularity to impose the SID
>    stack of an appropriate depth.  MSD is relevant to the head-end of a
>    SR tunnel or Binding-SID anchor node where Binding-SID expansions
>    might result in creation of a new SID stack.
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-isis-segment-routing-msd-05
> https://datatracker.ietf.org/doc/html/draft-ietf-isis-segment-routing-msd-
> 05
> 
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-segment-routing-msd-05
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
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