In　prior　work,　a　proposed　two-wavelength　design　for　high-speed　access　links　was　shown　to　be　a　cost-effective　means　for　large　enterprises　to　improve　the　performance　of　large　dataset　transfers.　In　this　original　design,　requests　to　dynamically　connect　a　second　wavelength　to　one　of　the　shared　high-speed　provider　IP-router　ports　for　large　dataset　transfers　are　handled　in　Immediate-Request　(IR)　mode.　In　this　paper,　we　consider　an　alternative　solution　for　sharing　high-speed　provider　ports,　i.e.,　Advance-Reservation　(AR)　mode,　which　requires　provider-side　storage.　Simulation　results　show　that　the　AR-mode　solution　can　achieve　performance　improvements　over　the　IR-mode　solution　in　terms　of　blocking　probability　and　average　response　times.　We　also　provide　a　differential　cost-and-power　comparison　of　the　AR-with-storage　mode　and　the　IR　mode　to　quantify　the　extra　cost　and　power　consumption　introduced　by　the　in-network　storage　needed　in　the　AR　mode.　©　2018　IEEE.