This object is related to the object hh3cMPortGroupLimitNumber.
If the current IGMP group number is less than the value of
hh3cMPortGroupLimitNumber, any new IGMP group is permitted.
If the current IGMP group number equals to the value of
hh3cMPortGroupLimitNumber and the value of this object is enabled,
the group with the minimum multicast address will be replaced by
the new group.
If the current IGMP group number equals to the value of
hh3cMPortGroupLimitNumber and the value of this object is disabled,
none of new group will be permitted.