With the custom option, there is no restriction about the ports that are selected for VxRail networking reside on the PCIe adapter card in the first slot. If there is more than one PCIe adapter card, ports can be selected from either card.
Dell VxRail Network Planning Guide
Introduction
Plan the VxRail network
VxRail Cluster Types
VxRail feature-driven decision points
VxRail hardware and switch selection decision points
Prepare the data center to implement VxRail
Plan the VxRail cluster implementation
Planning vSAN Witness Networking
Planning VxRail Satellite Nodes Networking
Configure the Network for VxRail
Prepare to build the VxRail cluster
VxRail network considerations after implementation
Appendix A: VxRail Network Configuration Table
Appendix B: VxRail Passwords
Appendix C: VxRail cluster setup checklist
Appendix D: VxRail Open Ports Requirements
Appendix E: VMware VDS port group default settings
Appendix F: Physical Network Switch Examples
Custom option: Two NDC/OCP ports paired with PCIe ports other than the first slot
Custom option: Two NDC/OCP ports paired with PCIe ports other than the first slot
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Figure 75. VxRail nodes with any two 10/25 Gb NDC/OCP ports and any two 10/25 Gb PCIe ports connected to two ToR switches, and one optional connection to management switch for iDRAC. VxRail nodes with any two 10/25 Gb NDC/OCP ports and any two 10/25 Gb PCIe ports connected to two ToR switches, and one optional connection to management switch for iDRAC