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Dell Networking SmartFabric Services with VxRail vSAN Stretched Cluster Reference Architecture
Introduction Topology
Topology
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Topology

Home > Integrated Products > VxRail > Guides > Dell Networking SmartFabric Services with VxRail vSAN Stretched Cluster Reference Architecture > Topology

Topology

  • The figure below shows the topology used in this deployment. Stretched clusters require three fault domains: preferred, secondary, and witness. They may also be referred to as Sites 1, 2, and 3.

    Figure 1. SFS with VxRail multisite stretched cluster

    This design requires a SmartFabric deployed at Sites 1 and 2. Using a SmartFabric at Site 3 is optional and is not used in this example. This example uses a four-leaf/two-spine SmartFabric in Site 1, and a two-leaf SmartFabric in Site 2. At a minimum, a two-leaf SmartFabric is required at Sites 1 and 2. Up to 16 leaf switches and four spine switches are supported at each site.

    When spines are used, SFS uses BGP-EVPN to stretch L2 networks across the L3 leaf-spine fabric. In a multisite topology, the L2 networks are also stretched between Sites 1 and 2 in the same manner using SFS multisite fabric interconnects.

    VxRail nodes in the VxRail vSAN stretched cluster are in Sites 1 and 2. The nodes are named vxrail-01 through vxrail-06 in this example. The required witness host, named witness01, is deployed in Site 3. For this deployment example, a VMware ESXi host, named esx-svcs01, is also installed in Site 1. This ESXi host is the host for the OpenManage Network Integration (OMNI) VM and is also the initial host for a DNS and NTP services VM.

    Note: In addition to the topology shown in the figure above, an OOB management network is required for management of the SmartFabric. OOB management network details are in the SmartFabric Services with Multisite vSAN Stretched Cluster Deployment Guide.