Re: [quicwg/base-drafts] Clarify zero-length CIDs and active_connection_id_limit TP (#3426)

Martin Thomson <notifications@github.com> Wed, 11 March 2020 22:53 UTC

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Subject: Re: [quicwg/base-drafts] Clarify zero-length CIDs and active_connection_id_limit TP (#3426)
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martinthomson commented on this pull request.



> @@ -4697,11 +4697,12 @@ active_connection_id_limit (0x000e):
   to store. This value includes the connection ID received during the handshake,
   that received in the preferred_address transport parameter, and those received
   in NEW_CONNECTION_ID frames.
-  Unless a zero-length connection ID is being used, the value of the
-  active_connection_id_limit parameter MUST be no less than 2. If this
-  transport parameter is absent, a default of 2 is assumed.
-  When a zero-length connection ID is being used, the active_connection_id_limit
-  parameter MUST NOT be sent.
+  The value of the active_connection_id_limit parameter MUST be at least 2.
+  If this transport parameter is absent, a default of 2 is assumed.  If an
+  endpoint uses a zero-length connection ID, the active_connection_id_limit
+  value received from its peer is ignored and not used, as
+  NEW_CONNECTION_ID frames cannot be sent by an endpoint that opts for a
+  zero-length connection ID.
 

If the new connection includes a zero-length connection ID, then the value of the transport parameter is not relevant.  It should still be remembered though.

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