The image shows primary and standby on-premises data centers, Azure regions, and OCI regions.

The primary and standby data centers both include a database system and a workload primary. They share a bi-directional connection.

The primary Azure region has an availability zone with:

• A primary VNet containing an app subnet with workload primary, a delegated client subnet with a primary network interface, and a secure hub, vWAN, and firewall manager.
• A primary OCI child site with an OCI-managed network, a primary VCN that spans into the primary OCI region and that includes a client subnet, and a backup subnet, both with Oracle Exadata Database Service, and a primary local peering gateway.

The standby Azure region has the same architecture, except it does not have the vWAN or firewall manager.

The primary OCI region has a primary hub VCN with a primary hub route table, a hub primary local peering gateway, and a primary dynamic route gateway.

The standby OCI region has the same architecture, except it has a standby dynamic route gateway, and a standby hub route table.

The on-premises data center has a bi-directional connection via Azure Express Route to the secure hub in the primary VNet. A DNS also connects to the secure hub, and the secure hub connects to the workload primary.

The primary network interface connects to the primary Exadata service, which has a bi-directional connection to the standby Exadata service via Data Guard.

The primary local peering gateway and primary hub local peering gateway share a connection via LPG peering.

The primary and standby DRGs share a connection via RPC peering