9. Stopping a Test

この節では UDPSTP の RFC テキストを保持し, One-Way IP Capacity metrics, Control and Data phases, Load and Status Feedback PDUs, KDF/HMAC authentication, optional checksum handling, IANA registries, security considerations を扱う.

RFC 原文

9.  Stopping a Test

   When the test duration timer (testIntTime) on the server expires, it
   SHALL set the local connection test action to TEST_ACT_STOP1 (phase 1
   of graceful termination).  This is simply a non-reversible state
   awaiting the next message(s) to be sent from the server.  During this
   time, any received Load or Status PDUs are processed normally.

   Upon transmission of the next Load or Status PDUs, the server SHALL
   set the local connection test action to TEST_ACT_STOP2 (phase 2 of
   graceful termination) and mark any outgoing PDUs with a testAction
   value of TEST_ACT_STOP2.  While in this state, the server MAY reduce
   any Load PDU bursts to a size of one.

   When the client receives a Load or Status PDU with the TEST_ACT_STOP2
   indication, it SHALL finalize testing, display the test results, and
   mark its local connection with a test action of TEST_ACT_STOP2 (so
   that any PDUs subsequently received can be ignored).

   With the test action of the client's connection set to
   TEST_ACT_STOP2, the very next expiry of a send timer, for either a
   Load or a Status PDU, SHALL result in it and any subsequent PDUs
   being sent with a testAction value of TEST_ACT_STOP2 (as confirmation
   to the server).  While in this state, the client MAY reduce any Load
   PDU bursts to a size of one.  The client SHALL then schedule an
   immediate end time for the connection.

   When the server receives the TEST_ACT_STOP2 confirmation in the Load
   or Status PDU, the server SHALL schedule an immediate end time for
   the connection that closes the socket and deallocates the associated
   resources.  The TEST_ACT_STOP2 exchange constitutes a graceful
   termination of the test.

   In a non-graceful test stop due to path failure, the watchdog
   timeouts at each endpoint will expire (sometimes at one endpoint
   first); notifications in logs, STDOUT, and/or formatted output SHALL
   be made; and the endpoint SHALL schedule an immediate end time for
   the connection.

   If an attacker clears the TEST_ACT_STOP2 indication, then the
   configured test duration timer (testIntTime) at the server and client
   SHALL take precedence and the endpoint SHALL schedule an immediate
   end time for the connection.