Re: [GROW] I-D Action: draft-ietf-grow-wkc-behavior-02.txt

[David Farmer <[e-mail]>]

On Tue, Jan 22, 2019 at 7:05 PM Jay Borkenhagen <[e-mail]> wrote:

>
> Regarding David Farmer's suggestion that RFC1997 needs to be updated:
> speaking for myself, I would be satisfied leaving RFC1997 as-is while
> this draft documents RFC1997's shortcomings.  Anyone with strong
> feelings to the contrary may write that draft.
>

Thinking this through a little more there are two separate issues that seem
to be treated as one;

1.  I suggested changing "MUST NOT be advertised" to "SHOULD NOT be
advertised" in the definition of the three Well-Known Communities provided
in RFC 1997.

  a. Since BGP Communities are advisory in the first place, an absolute
prohibition seems out of place, especially when the default "set" directive
by most implementations results in the behavior that is prohibited by the
statement.

  b. While I think it would be a good idea to fix this now, if that doesn't
happen, I can live with it the way it is.

2. However separately, if this document doesn't provide a meta-data link
updating RFC 1997, or a reference to this document is not somehow included
in the IANA Well-Known Communities Registry, how are implementers of RFC
1997 BGP Community to know they "MUST ensure that any Well-Known
Communities specified after this document's publication are removed by
their "set" directive."  By my understanding, this new requirment is
updating RFC 1997, so a meta-data linkage is warranted in my mind, even
without #1 above.

Thanks.

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