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#3348 Clarify that you can use any issued CID at any time, even during the handshake #3438

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4 changes: 3 additions & 1 deletion draft-ietf-quic-transport.md
Expand Up @@ -1002,7 +1002,9 @@ When an endpoint issues a connection ID, it MUST accept packets that carry this
connection ID for the duration of the connection or until its peer invalidates
the connection ID via a RETIRE_CONNECTION_ID frame
({{frame-retire-connection-id}}). Connection IDs that are issued and not
retired are considered active; any active connection ID can be used.
retired are considered active; any active connection ID is valid for use at any
time, in any packet type. This includes the connection ID issued by the server
via the preferred_address transport parameter.

An endpoint SHOULD ensure that its peer has a sufficient number of available and
unused connection IDs. Endpoints store received connection IDs for future use
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