VCN Peering we need to have different CIDR Blocks without overlap, so I choose 10.254.0.0/16 and 172.16.0.0/16 from two different regions Hyd and Mumbai.

	VCN -1	VCN – 2
REGION	HYDERABAD	MUMBAI
VCN NAME	HYD_REGION_VCN	MUMBAI_REGION_VCN
VCN CIDR	10.254.0.0/16	172.16.0.0/16
DRG	HYD_DRG	MUMBAI_DRG
RPC	HYD_RPC	MUM_RPC

Create Two VCNs in Hyderabad and Mumbai Regions with CIDR 10.254.0.0/16 and 172.16.0.0/16

Create Two DRGs in Hyderabad and Mumbai Regions

Create VCN Attachment in both DRGs, pointing to respective VCN.

In HYD DRG

In MUM DRG

Create Remote Peering Connection in both DRG regions.

In HYD DRG, create RPC

In MUM DRG, create RPC

Peering status is in NEW state both the sides

Now establish the peering between two VCNs

Go to any one of the RPC -> Click on Establish connection, provide Mumbai region and OCID of other RPC (Mumbai)

Check the Peering status from both the sides

Update the Route Table and Security Rules and Verify the connectivity between VCNs

Established the communication from the CIDR 10.254.0.0/16 to 172.16.0.0/16

Happy Learning !!