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
+---------------+---------------+---------------+---------------+
|         T_PATH_LABEL          |          Length + 4           |
+---------------+---------------+---------------+---------------+
|     Flags     |  Path Label   |        Nexthop Label          |
|               |  Hop Count    |                               |
+---------------+---------------+---------------+---------------+
/                                                               /
/               Path label bitmap (Length octets)               /
/                                                               /
+---------------+---------------+---------------+---------------+