The ID of the MAC access list to be applied. User maybe specify access list ID(by this object) or name (by dAclMacAccessGroupAclName) to be applied. If both access list ID and name are specified, the access list name specified by dAclMacAccessGroupAclName will be take.
Sources for this description
D-Link official switch MIBsD-Link MIB copies (LibreNMS/Observium Community)