Defines an entry in the tmnxOamVccvTrNextPwSegmentTable. The first two
index elements identify the tmnxOamTrCtlEntry that a
tmnxOamVccvTrNextPwSegmentEntry belongs to. The third index element
identifies an OAM trace route test run. The fourth, fifth and sixth
index elements select a single OAM 'vccvTraceRoute' reply.