The value of tLagLACPSelCritSlaveToPartner specifies together with
tLagLACPSelCrit selection criteria should be used to select the
active sub-group.
The term 'eligible member' refers to a lag-member link which can
potentially become active. This means it is oper up, and not disabled
for use by the remote side. The object tLagLACPSelCritSlaveToPartner
can be used to control whether ornot this latter condition is taken
into account.