Indicates the actual operational status of this tunnel,
which is but not limited to the status of this tunnel of
a certain period.Reference to MPLS-TE-STD-MIB.
Options:
1. up(1) -indicates that the operational status of this tunnel is up.
2. down(2) -indicates that the operational status of this tunnel is down.
3. testing(3) -indicates that the tunnel is used in some test mode.
4. unknown(4) -indicates the invalid value.
5. dormant(5) -indicates that the status cannot be determined.
6. notPresent(6) -indicates that some component is missing
7. lowerLayerDown(7) -indicates the Down state due to the state of lower layer interfaces.