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
 +---------------+---------------+---------------+---------------+
 |               |               |                               |
 |    Version    |  PT_TR_REPLY  |          PacketLength         |
 |               |               |                               |
 +---------------+---------------+---------------+---------------+
 |                               |               |               |
 |            Reserved           |     Flags     | HeaderLength  |
 |                               |               |               |
 +---------------+---------------+---------------+---------------+
 |                                                               |
 |                       Path Label TLV                          |
 |                                                               |
 +---------------+---------------+---------------+---------------+
 |                                                               |
 |                 Traceroute Reply Message TLVs                 |
 |                                                               |
 +---------------+---------------+---------------+---------------+