An entry in this table represents an MPLS tunnel.
An entry can be created by a network administrator
or by an SNMP agent as instructed by an MPLS
signaling protocol. Whenever a new entry is created
with mplsTunnelIsIf set to true(1), then a
corresponding entry is created in ifTable as well
(see RFC 2863). The ifType of this entry is
mplsTunnel(150).