The value of tmnxDot3OamTunneling specifies if OAMPDUs should
be passed transparently through the OAM entity for processing
by another OAM entity across the network, or if OAMPDUs should be
terminated and processed at the local OAM entity. This object
can only be set to 'true' if dot3OamAdminState is set to 'disabled'.
Likewise, dot3OamAdminState can only be set to 'enabled' if this
object is set to 'false'. It is not valid to try and enable both
OAMPDU processing and OAMPDU tunneling on the same OAM entity.