DLDP enable or disable systematically.
This node only supports set operation.
If setting it to true, all the fiber ports will enable DLDP and
the agent automatically creates new rows for each port in
h3cDLDPPortDLDPTable.
If setting it to false, all the fiber ports will disable DLDP
and the agent automatically destroy the corresponding rows in
h3cDLDPPortDLDPTable.