This image shows the architecture for private network connectivity between two tenancies and across regions.
Company A and Company B have separate tenancies.
Company A has a VCN 10.0.0.0/16 in the US East (Ashburn) region. Company B has two VCNs, each in a different region: VCN B 172.16.0.0/16 in US East (Ashburn) and VCN C 192.168.0.0/16 in India West (Mumbai).
VCN A and VCN B are peered locally (that is within the Ashburn region) using local peering gateways (LPGs).
VCN B and VCN C are peered remotely (that is across regions) using dynamic routing gateways (DRGs).
VCN A has route rules to direct traffic to VCNs B and C through the LPG.
VCN B has route rules to direct traffic to VCN A through the LPG and to VCN C through the DRG.
VCN C has route rules to direct traffic to VCNs A and C through the DRG.