[hackathon] Re: reserved fields: must be zero

Paul Kyzivat <pkyzivat@alum.mit.edu> Mon, 06 May 2024 20:38 UTC

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Subject: [hackathon] Re: reserved fields: must be zero
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Date: Mon, 06 May 2024 20:38:25 -0000
X-Original-Date: Mon, 6 May 2024 16:27:45 -0400

On 5/6/24 4:00 PM, Reshad Rahman wrote:

> I promised myself I wouldn't respond to this thread but I can't resist 
> anymore :-)
> 
> My preference for MUST/SHOULD is because an implementation may check for 
> MBZ bits being non-zero and increment a counter. That can help in 
> troubleshooting. I agree with the rest above (don't throw an error, 
> don't drop the packet etc if an MBZ field is non-zero.

The MUST ignore here pertains to any behavior that impacts the 
conformance of the implementation of the protocol.

Collecting information for testing, etc. is separate. I'm inclined to 
think this can go unsaid, but I'm open to someone crafting specific 
language about it. I consider this to fall into the same "unspecified" 
bucket that deals with responding to non-conforming behavior where 
protocol says nothing.

	Thanks,
	Paul