This diagram shows an architecture with four regions: AWS Region 1 and OCI Region 1, and OCI Region 2, and AWS Region 2.

It shows one primary database and two standbys. Standby 1 is local to Region 1 in a different Availability Zone. Standby 2 is remote in Region 2.
Connectivity uses Local Peering Gateways (LPGs) within each OCI region and Dynamic Routing Gateways (DRGs) with remote peering between OCI Region 1 and OCI Region 2.
Active Data Guard sends redo between the databases across this path.

AWS Region 1 includes Availability Zone 1; an ODB network hosting Oracle Database@AWS, with VCN1 CIDR 10.10.0.0/16 with a Client subnet 10.10.1.0/24 and a Backup subnet 10.10.0.0/24. The Primary Database is shared between the Backup and Client subnets.

Two LPG attachments connect to OCI Region 1: LPG1 Local and LPG1 Remote.
LPG1 Local is used for local peering inside Region 1.
LPG1 Remote forwards traffic destined for Region 2 via the hub and DRG.

AWS Region 1 also includes Availability Zone 2; an ODB network hosting Oracle Database@AWS, with VCN2 CIDR 10.20.0.0/16 with a Client subnet 10.20.1.0/24 and a Backup subnet 10.20.0.0/24. The Primary Database is shared between the Backup and Client subnets. Standby 1 Database is shared between the Backup and Client subnets.

Two LPG attachments connect LPG2 Local for peering to the local hub in OCI Region 1
LPG2 Remote for traffic that traverses the hub.

OCI Region 1 hosts Hub VCN1 CIDR 10.11.0.0/16 and two Local Peering Gateways: Hub LPG1 and Hub LPG2.

Hub LPG1 peers with LPG1 Local from VCN1.
Hub LPG2 peers with LPG2 Local from VCN2.

Each hub LPG has its own route table, labeled Hub LPG1 Route Table and Hub LPG2 Route Table.
Dynamic Routing Gateway DRG1 connects Hub VCN1 to OCI Region 2. DRG1 has a route table labeled DRG1 Route Table.
For primary-to-Standby 1 communication, traffic flows from VCN1 to LPG1 Local to LPG2 Local to hub routing to Hub LPG2 to LPG2 Local to VCN2.
Traffic destined for Region 2: VCN2 to LPG2 Remote Hub LPG2 through DRG1 via remote peering to DRG3 in OCI Region 2.

OCI Region 2 hosts Hub VCN3 CIDR 10.33.0.0/16 with the following:

A Local Peering Gateway named Hub LPG3, with its route table labeled Hub LPG3 Route Table.
Dynamic Routing Gateway DRG3 with a route table labeled DRG3 Route Table.

DRG1 in OCI Region 1 and DRG3 in OCI Region 2 are connected using remote peering.

Downstream from Hub LPG3, traffic goes to LPG3 Remote toward AWS Region 2 with Availability Zone 3, an ODB network hosting Oracle Database@AWS.

VCN3 CIDR 10.30.0.0/16 hosts a Client subnet 10.30.1.0/24 and Backup subnet 10.30.0.0/24. Standby 2 Database runs here is shared between the two subnets. LPG3 Remote connects to Hub LPG3 in OCI Region 2 via local peering.