This object contains an first unused value for fsDhcp6SrvOptionIndex in the fsDhcp6SrvOptionTable or a zero value to indicate that next index does not exists. This object will give the first empty index value for example when user create the four rows of fsDhcp6SrvOptionTable with index 1.2,1.5,1.6,1.8.Then fsDhcp6SrvOptionIndex object will return the value 1 as first unused Index.