Re: [Anima] Alexey Melnikov's Discuss on draft-ietf-anima-grasp-12: (with DISCUSS and COMMENT)

Alexey Melnikov <aamelnikov@fastmail.fm> Mon, 29 May 2017 20:07 UTC

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From: Alexey Melnikov <aamelnikov@fastmail.fm>
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Date: Mon, 29 May 2017 21:24:44 +0100
Cc: The IESG <iesg@ietf.org>, draft-ietf-anima-grasp@ietf.org, Sheng Jiang <jiangsheng@huawei.com>, anima-chairs@ietf.org, anima@ietf.org
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To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Subject: Re: [Anima] Alexey Melnikov's Discuss on draft-ietf-anima-grasp-12: (with DISCUSS and COMMENT)
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Hi Brian,

On 29 May 2017, at 02:57, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:

>> 3.5.4.3.  Discovery Procedures
>> 
>> In 6th para:
>> 
>>   The cache mechanism MUST include a lifetime for each entry.  The
>>   lifetime is derived from a time-to-live (ttl) parameter in each
>>   Discovery Response message.  Cached entries MUST be ignored or
>>   deleted after their lifetime expires.  In some environments,
>>   unplanned address renumbering might occur.  In such cases, the
>>   lifetime SHOULD be short compared to the typical address lifetime and
>>   a mechanism to flush the discovery cache MUST be implemented.
>> 
>> How can the discovery cache be flushed?
> 
> I think that's completely implementation-dependent, so what can we say?
> (In the prototype, it's an API call.)

I think you just demonstrated my point that some requirements are not very clear whom they apply to. Passive voice is causing ambiguity here.

I think I would like to see more text on what different possible alternatives are and which entities need to implement the MUST.