1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+---------------+---------------+---------------+---------------+
|       Type (=T_DISC_REQ)      |             Length            |
+---------------+---------------+---------------+---------------+
|                     Request Arrival Time                      |
+---------------+---------------+---------------+---------------+
/                        Node Identifier                        /
+---------------+---------------+---------------+---------------+