The flag bits are simply part of the objective option, so they are always
included in the discovery message (see
https://www.rfc-editor.org/rfc/rfc8990.html#name-format-of-objective-options).
It MAY also be present in the response. It could be used for a consistency
check or used actively in Dry Run mode. (We could possibly add new flags in
future.)
Regards,
Brian Carpenter
(via tiny screen & keyboard)
On Tue, 27 Jul 2021, 20:04 Dangjuanna, <[email protected]> wrote:
> Hi,
>
> I am also studying the GRASP objective definition recently.
> I have one question: why does F_SYNCH_bits appear in the discovery process?
>
> Best wishes,
> Joanna
>
> -----Original Message-----
> From: Anima [mailto:[email protected]] On Behalf Of Brian E Carpenter
> Sent: 2021年7月27日 12:41
> To: Anima WG <[email protected]>
> Subject: [Anima] draft-bernardos-anima-fog-monitoring-04
>
> Hi,
>
> One quick comment on the draft.
>
> > An example of discovery message using GRASP would be the following
> > (in this example, the fog monitoring controller is identified by
> > its IPv6 address: 2001:DB8:1111:2222:3333:4444:5555:6666):
> >
> > [M_DISCOVERY, 13948745, h'20010db8111122223333444455556666',
> > ["FOGDOMAIN", F_SYNCH_bits, 2, "operator1"]]
>
> If I can make a suggestion, I think it is better to start with an informal
> descrition and a CDDL definition of the GRASP objective. The details of the
> message don't really help the reader understand.
>
> Also I am not sure it needs multiple GRASP objectives. I think Toerless
> has a very good idea in his service description mechanism
> (draft-eckert-anima-grasp-dnssd), with JSON-like dictionaries that are very
> flexible, easily extensible, and trivial to map into CBOR. I don't think
> that changes the model, it just gives a lot more flexibility for the
> future. I think it would also make mapping to and from YANG based
> mechanisms a lot easier.
>
> Regards
> Brian Carpenter
>
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