The second vDS provides several different network topologies. Some of these topologies are covered in this section. Note in these examples, we focus on the connectivity from the vDS and do not take the NIC card to vDS uplink into consideration as with the new feature for custom profiles there are too many combinations to cover in this guide.
The first option uses four pNICs, two uplinks on the VxRail (system) vDS and two uplinks on the NSX vDS.
If we now consider the 2-vDS design and NIC level redundancy, the VxRail vDS must be deployed using a custom profile using uplink1/uplink2 for all traffic with uplink1 mapped to a port on the NDC and the second uplink2 mapped to a port on the PCIe providing NIC level redundancy for the system traffic. When the cluster is added to VCF, the remaining two pNICs (one from NDC and one from PCIe) can be selected to provide NIC level redundancy for the NSX traffic. The next diagram illustrates this network design.
There are two options in a 6-pNIC design with two vDS. For the first option, we have four pNICs on the VxRail vDS and use two additional pNICs dedicated for NSX traffic on the NSX vDS. This might be required if NSX-T needs to use dedicated pNICs. A dedicated edge cluster might be one use case where we need to reserve all bandwidth for NSX traffic only.
The second option with six pNICs will use a system vDS with two pNIC and the NSX vDS with four pNICs. This will increase the bandwidth for NSX East/West traffic between transport nodes. The use case for this design might be when the East/West bandwidth requirement scales beyond two pNICs. The host overlay traffic will use all four uplinks on the NSX vDS, load- balanced using source ID teaming. If AVN is enabled for the management WLD or Edge automation is used for VI WLD, Edge traffic uses uplink 1 and 2 on NSX vDS. This includes both the Edge overlay and Edge uplink traffic.
Note: If AVN is enabled, or Edge automation is used for VI WLD, Edge traffic uses uplink 1 and 2 on NSX-T vDS. Manual Edge deployment for the VI WLD can allow for additional configurations.
The 8-pNIC option that is illustrated in the following diagram provides a high level of network isolation and also the maximum bandwidth for NSX East/West between host transport nodes. At the cost of a large port count on the switches, each host requires four ports per switch. The VxRail vDS (system) will use four uplinks and the NSX vDS will also use four uplinks.