Various network topologies for switch(es) and VLANs are possible with VxRail Appliances. Complex production environments will have multiple core switches and VLANs. A site diagram showing the proposed network components and connectivity is highly recommended before cabling and powering on VxRail Appliances.
Be sure to follow your switch vendor’s best practices for performance and availability. For example, packet buffer banks may provide a way to optimize your network with your wiring layout.
Decide if you plan to use one or two switches for VxRail. One switch is acceptable and is often seen in test and development environments. To support high availability and failover in production environments, two or more switches are required. The VxRail appliance is a software-defined datacenter which is totally dependent on the physical top-of-rack switch for network communications. A lack of network redundancy places you at risk of losing availability to all of the virtual machines operating on the appliance.
The following figure shows the recommended physical network setup using a management switch (for iDRAC) and two ToR switches. Other network setup examples can be found in the Physical Network Switch Examples appendix.
Figure 7 Network topology of a 4-node VxRail cluster in a single rack connected to two 10 GbE switches using 2x10GbE connections per node, and a separate switch for out-of-band management.