Hi Phil Thanks for the reply. I had a look into it, QSFP-40G-LR4 is end of sale now and QSFP-40G-LR4-S is the single mode QSFP available but do you have any idea whether i can breakout it to 4x10G connections using MTP/MPO cables.

Thank you for the good post. can you advise me the correct QSFP model for N7K. We are looking for single mode QSFP for N7K NX-OS - 6.2(6) Line Card: N7K-F312FQ-25 Hari