I don't see anything around MD5/TCPAO authentication.

>From https://tools.ietf.org/html/rfc6198

" Security considerations MUST be addressed by the proposed solutions.
   In particular, they SHOULD address the issues of bogus g-shut
   messages and how they would affect the network(s), as well as the
   impact of hiding a g-shut message so that g-shut is not performed."

I may have missed it somewhere?


if (initial_ttl!=255) then (rfc5082_compliant==0)
donald.sm...@centurylink.com

________________________________________
From: GROW [grow-boun...@ietf.org] on behalf of bruno.decra...@orange.com 
[bruno.decra...@orange.com]
Sent: Thursday, December 14, 2017 7:42 AM
To: Ben Campbell
Cc: grow-cha...@ietf.org; draft-ietf-grow-bgp-gs...@ietf.org; grow@ietf.org; 
The IESG
Subject: Re: [GROW] Ben Campbell's Yes on draft-ietf-grow-bgp-gshut-12: (with 
COMMENT)

Ben,

Thanks for your review and comments.
More inline. [Bruno]

> From: Ben Campbell [mailto:b...@nostrum.com]
>
 > Ben Campbell has entered the following ballot position for
 > draft-ietf-grow-bgp-gshut-12: Yes
 >
 > When responding, please keep the subject line intact and reply to all
 > email addresses included in the To and CC lines. (Feel free to cut this
 > introductory paragraph, however.)
 >
 >
 > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
 > for more information about IESG DISCUSS and COMMENT positions.
 >
 >
 > The document, along with other ballot positions, can be found here:
 > https://datatracker.ietf.org/doc/draft-ietf-grow-bgp-gshut/
 >
 >
 >
 > ----------------------------------------------------------------------
 > COMMENT:
 > ----------------------------------------------------------------------
 >
 > I'm balloting "yes" because I think it's important to publish this. But, like
 > Alvaro,  I wonder why this is not standards track, BCP, or just about 
 > anything
 > but informational. So I support his DISCUSS, including his the comments on 
 > how
 > to resolve it.

[Bruno] Well noted: we now have 3 AD asking for STD track.
If you don't mind, to avoid duplication, I'll follow up on Alvaro's email. (in 
short, STD track is ok for me)

 > -1, last paragraph: This references RFC 8174, but does not use the actual 
 > 8174
 > boilerplate. Is there a reason not to do so?

[Bruno] My mistake: I had a comment to reference RFC 8174 rather than RFC 2119. 
I was not aware that this also implied changing the text.
My understanding is the following:
OLD:
         <t>The key words "MUST", "MUST NOT", "REQUIRED", "SHALL",
         "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY",
         and "OPTIONAL" in this document are to be interpreted as
         described in RFC 8174 <xref target="RFC8174"/>.</t>


NEW
        <t>The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
      NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED",
      "MAY", and "OPTIONAL" in this document are to be interpreted as
      described in [BCP14] <xref target="RFC2119"/> <xref target="RFC8174"/> 
when, and only when, they
      appear in all capitals, as shown here.</t>



That being said, the irony is that RFC 8174 does not use an upper case "should":
"Authors who follow these guidelines should incorporate this phrase near the 
beginning of their document:"
https://tools.ietf.org/html/rfc8174#section-2

--Bruno

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