The value of the object tmnxL2tpTuStatusAssignmentId indicates
a string that distinguishes this Layer Two Tunneling Protocol Tunnel.
This object is related to the RADIUS attribute Tunnel-Assignment-ID.
If this tunnel corresponds to an entry in the tmnxL2tpTuCfgTable, the
value of this object is equal to the value of the object
tmnxL2tpTuCfgName.