Re: [Anima] Lightweight GRASP
Esko Dijk <esko.dijk@iotconsultancy.nl> Mon, 18 March 2024 11:15 UTC
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From: Esko Dijk <esko.dijk@iotconsultancy.nl>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>, "蒋胜 (Sheng Jiang)" <shengjiang@bupt.edu.cn>, Anima WG <anima@ietf.org>
Thread-Topic: [Anima] Lightweight GRASP
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Date: Mon, 18 Mar 2024 11:14:27 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/anima/4jdXUs-DOEmMkrImelktlV1ql-8>
Subject: Re: [Anima] Lightweight GRASP
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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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- [Anima] Lightweight GRASP Brian E Carpenter
- Re: [Anima] Lightweight GRASP Esko Dijk
- Re: [Anima] Lightweight GRASP Sheng JIANG