NAME

  T1CookieRetrans.seq - COOKIE-ECHO message is transmitted again if T1-cookie timer expires

PURPOSE

  To check that if T1-cookie timer expires then the endpoint MUST retransmit
  COOKIE ECHO and restart the T1-cookie timer without changing state.

SYNOPSIS

  ./T1CookieRetrans.seq [-tooloption ...] -pkt ./T1CookieRetrans.def
    -tooloption : v6eval tool option
  See Also: ../common/STD_PKT_COMMON.def
            ../common/SCTP_COMMON.def

PRE-TEST CONDITION

  Association is not established between endpoint A and B. Arrange the 
  data in Endpoint A such that COOKIE-ACK is not sent in response to 
  COOKIE-ECHO message.

TEST PROCEDURE

  Endpoint A                           Endpoint B                ULP
  (CLOSED)                             (COOKIE-ECHOED)

                <----------------       COOKIE-ECHO
  Don't send                            Start T1-cookie timer
  COOKIE-ACK message                          |
                                              |   T1-cookie timer expires
                                              |
                <----------------       COOKIE-ECHO                       
                                        Restart T1-cookie Timer

  TEST DESCRIPTION:

  1. Try to make an association from endpoint B to endpoint A by sending
     COOKIE-ECHO message from endpoint B.
     Record the message sequence using a signal emulator.
  2. Check A: COOKIE-ECHO message is sent again after expiry of 
     T1-cookie timer.
  3. Check B: Was the message sequence as above.

NOTE

  None

REFERENCE

  RFC 4960

  4.  SCTP Association State Diagram

    Notes:

    3)  If the T1-cookie timer expires, the endpoint MUST retransmit
        COOKIE ECHO and restart the T1-cookie timer without changing
        state.  This MUST be repeated up to 'Max.Init.Retransmits' times.
        After that, the endpoint MUST abort the initialization process
        and report the error to the SCTP user.