Do I need to buy a Ethernet 100GbE cable?

Hi, I am new to RDMA or Mellanox related things and my question may sound quite silly. My group is considering buying some new machines and may equip them with Mellanox connectX-5 VPI adapter NICs. The switch is Edgecore Wedge 100BF-32X programmable switch. If we want to work with RoCE, is it necessary to connect these adapters to the switch with an Ethernet 100GbE cable (e.g., NVIDIA MCP1600-C00AE30N DAC Cable Ethernet 100GbE QSFP28)?

Hello Huangwentaochina,

Thank you for posting your inquiry on the NVIDIA Developer Forum - Infrastructure and Networking - Section.

Yes, if you want to connect the ConnectX-5 VPI adapter to your Ethernet switch, you need to use a supported Ethernet cable for the ConnectX-5 VPI.
The ConnectX-5 VPI has the ability to change the port type from IB to Ethernet and vice-versa. You can review the following link on how-to change the port_type → Ethernet Interface - MLNX_OFED v5.6- - NVIDIA Networking Docs

Thank you and regards,
~NVIDIA Networking Technical Support

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