Moving an application physically from one region to another represents a networking challenge, especially if applications have hard-coded IP addresses. According to the requirements for the network address space and IP address assignment, you use either the same or a different IP address at the recovery region. In many situations, you assign new IP addresses because VLANs might not stretch between regions. 

This design uses NSX for vSphere to create virtual networks called application virtual networks (AVNs). In AVNs, you can place workloads using a single IP network address space that spans across data centers. AVNs have the following benefits:

  • Single IP network address space providing mobility between data centers

  • Simplified disaster recovery procedures

After a failover, the recovered application is available under the same IP address. 

Figure 1. Logical Network Design for Cross-Region Deployment with Application Virtual Networks

In the network configuration for disaster recovery, the application virtual networks are routed within the SDDC. Nodes on these network segments are reachable from within the SDDC. IPv4 subnets of application virtual networks, such as the subnet that contains the vRealize Suite components, overlap across a region.

The application virtual networks (orange networks) are routed across the SDDC. As a result, the nodes on these network segments are reachable from within the SDDC. The application virtual network Mgmt-xRegion01-VXLAN that contains the primary vRealize Suite components spans across regions.

NSX Edge devices provide the load balancing functionality. Each device fronts a network that contains the protected components of all management applications. In each region, you use the same configuration for the management applications and the relevant placeholder virtual machines. Active Directory and DNS services must be running in both the protected and recovery regions.

The virtual machines of Site Recovery Manager and vSphere Replication are on the VLAN backed management network in each region.