Date: Tue, 17 Sep 2019 08:56:11 -0700
From: Kazuho Oku <notifications@github.com>
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Message-ID: <quicwg/base-drafts/issues/3037/532284657@github.com>
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Subject: Re: [quicwg/base-drafts] Require peers to check if
 RETIRE_CONNECTION_ID sequence number is valid (#3037)
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@nibanks 
> The `SHOULD` is for `in a timely manner`. If you don't do it, the connection will eventually break, likely via a stateless reset.

The question is the intent of using "SHOULD in a timely manner" rather than "MUST in a timely manner". Yes, the connection would break, if the receiver does not migrate to a new connection ID. However, because we use a SHOULD, that is one of the expected outcomes when an endpoint sends a NEW_CONNECTION_ID frame carrying non-zero Retire Prior To field.

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<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=20663557" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/nibanks">@nibanks</a></p>
<blockquote>
<p>The <code>SHOULD</code> is for <code>in a timely manner</code>. If you don't do it, the connection will eventually break, likely via a stateless reset.</p>
</blockquote>
<p>The question is the intent of using "SHOULD in a timely manner" rather than "MUST in a timely manner". Yes, the connection would break, if the receiver does not migrate to a new connection ID. However, because we use a SHOULD, that is one of the expected outcomes when an endpoint sends a NEW_CONNECTION_ID frame carrying non-zero Retire Prior To field.</p>

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