Re: [Anima] Lightweight GRASP

Thanks, Esko and Brian, also Bing and Carsten, for your valuable feedback.

I will work on a primary draft towards next IETF meeting. I will start from protocol-independent model and also provide a CoAP-bound solution. Use case for constrained devices would also be introduced.

Any one who is interested to contribute or co-work on this is welcome to contact me.

Regards,

Sheng

> -----Original Message-----
> From: Anima <anima-bounces@ietf.org> On Behalf Of Esko Dijk
> Sent: Monday, March 18, 2024 7:14 PM
> To: Brian E Carpenter <brian.e.carpenter@gmail.com>; Sheng JIANG
> <shengjiang@bupt.edu.cn>; Anima WG <anima@ietf.org>
> Subject: Re: [Anima] Lightweight GRASP
> 
> One nice thing about CoAP is that it has also been defined/used over other
> transports, that are not UDP. Like directly over a serial link or over SMS.  This
> was another potential use case: to use GRASP when there's not even IP
> connectivity yet.
> 
> The charter says this about a potential new "lightweight GRASP":
> 
>     Generic use cases of Autonomic Network and new GRASP
> extensions/options for them
> 
> If one sees it as an extension of GRASP (ability to run over non-TCP, UDP, or
> non-IP transports) then it does fit in charter.
> 
> Defining some use cases would be relevant also - if it's a wired ANI then we
> don't have a huge amount of changes in links over times. If it's a wireless (e.g.
> 6LoWPAN) ANI then this may be the case.
> Even if mesh links are highly variable over time, resulting in more packet loss
> (e.g. 6LoWPAN situations), TCP may still work ok if it's tuned to this use case.
> OpenThread's TCP implementation was I believe tuned in this way based on
> work of Sam Kumar (see
> https://www.usenix.org/conference/nsdi20/presentation/kumar ) . In Thread's
> case, even when links change and mesh topology changes the nodes still keep
> their original IPv6 address so the TCP communication can continue in principle.
> I never tested TCP performance yet in this case, but it would be interesting to
> see if there's a problem there or not, depending on the level of links change.
> 
> Esko
> 
> -----Original Message-----
> From: Anima <anima-bounces@ietf.org> On Behalf Of Brian E Carpenter
> Sent: Monday, March 18, 2024 09:38
> To: 蒋胜 (Sheng Jiang) <shengjiang@bupt.edu.cn>; Anima WG
> <anima@ietf.org>
> Subject: [Anima] Lightweight GRASP
> 
> I think it would be good to see a first draft on this, with some ideas about UDP
> and COAP instead of TCP.
> 
> Regards
>     Brian
> 
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