Re: [Roll] Barry Leiba's Discuss on draft-ietf-roll-mpl-parameter-configuration-06: (with DISCUSS and COMMENT)

[Barry Leiba <[e-mail]>]

>>-- Section 2.3 --
>>
>>   A node SHOULD leave an MPL domain if it receives an updated MPL
>>   Parameter Configuration Option without a configuration for the MPL
>>   domain, unless it has overriding manual configuration on the MPL
>>   domain.  In other words, if a node is configured to work as a MPL
>>   Forwarder for a MPL domain regardless of DHCPv6 Options, the node MAY
>>   stay on the MPL domain even if it receives an MPL Parameter
>>   Configuration Option without configuration for the MPL domain.
...
>> Yes..I can see how this is confusing, and I think the fix is easy: remove
>> the second sentence.  This second sentence doesn¹t add new information and
>> it makes the text confusing by adding the ³MAY².
>>
>> I¹ll let Yusuke confirm that this is ok (and address your other comment).
>
> I agree with the fix. Thank you for suggestion.

That does correct the apparent contradiction, but it doesn't answer
one question I had, which seems to leave things uncertain:  Where the
text says, "A node SHOULD leave an MPL domain if it receives an
updated MPL Parameter Configuration Option without a configuration for
the MPL domain, unless it has overriding manual configuration on the
MPL domain," it's important to note that this still means that if you
*don't* have an overriding manual configuration on the domain, you
still SHOULD (not MUST) leave the domain.  That still means that you
could choose not to leave the domain.  Is that OK?

In other words:

1. You receive an updated MPL PCO without a config for the MPL domain.

1a. You *do* have an overriding manual configuration on the domain.
What are your choices?  I think you mean to say that your choices are
to stay on the domain or to leave it, at your option.

1b. You *don't* have an overriding manual configuration on the domain.
What are your choices?  I don't know whether you mean to say that you
MUST leave the domain in this case, or whether there might be other
reasons you might choose to stay, and the SHOULD is appropriate.

I'd still like an answer to those questions, so we can work out what
text will make that explicitly clear, and avoid confusion.  Do you see
why I'm uncertain?

Barry