You can deploy NSX-T Edge clusters with 2-tier routing to provide north-south routing and network services in the management domain and VI workload domains.
An NSX-T Edge cluster is a logical grouping of NSX-T Edge nodes. These NSX-T Edge nodes run on a vSphere cluster, and provide north-south routing and network services for the management and VI workloads. NSX-T Data Center supports a 2-tier routing model. In the top tier is the tier-0 logical router. Northbound, the tier-0 logical router connects to one or more physical routers or layer 3 switches and serves as a gateway to the physical infrastructure. Southbound, the tier-0 logical router connects to one or more tier-1 logical routers or directly to one or more logical switches. In the bottom tier is the tier-1 logical router. Northbound, the tier-1 logical router connects to a tier-0 logical router. Southbound, it connects to one or more logical switches.
During bring-up with application virtual networks (AVNs), VMware Cloud Foundation creates a two-node NSX-T Edge cluster on the management domain for use by the vRealize Suite components. You can add additional NSX-T Edge clusters on the management domain to scale out or if you need custom configured services.
By default, workload domains do not include any NSX-T Edge clusters and are isolated. Add one or more Edge clusters to a workload domain to provide routing and network services.
You can add multiple NSX-T Edge clusters to the management or workload domains for scalability and resiliency.
NSX-T Data Center supports a maximum of 16 Edge clusters per NSX Manager cluster and 8 Edge clusters per vSphere cluster.
The north-south routing and network services provided by an NSX-T Edge cluster created for a workload domain are shared with all other workload domains that use the same NSX Manager cluster.