The value of tLagStandbySignaling specifies
how the state of a member port is signalled to the remote side
when the tLagPortActiveStdby corresponding to this member port
has the value 'standby'.
lacp (1) - The state of this member port is signalled
to the other side through the LACP protocol.
powerOff (2) - This member port is powered off.
The value of tLagStandbySignaling can only be set to 'powerOff(2)'
when tLagEnableLACP is set to 'false(2)' and tLagLACPSelCrit is set
to 'bestPort(3)'.