Hi Brian,

On 29 May 2017, at 02:57, Brian E Carpenter <[email protected]> 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.


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