Manage overlapping subnet (different VPC) on same TGW

Question

Hi all,
 its' possible to manage overlapping subnet (different VPC) on same TGW?
Below an example of network project.

![Enter image description here](/media/postImages/original/IMa9u7caEuRLO18_7cHfHeqA)

Tnx

Accepted Answer

Not supported, See the [TransitGateway FAQ](https://www.amazonaws.cn/en/transit-gateway/faqs/)

**Q: Can I connect Amazon VPCs with overlapping CIDRs?**

A: Amazon Transit Gateway doesn’t support routing between Amazon VPCs with overlapping CIDRs. If you attach a new Amazon VPC that has a CIDR which overlaps with an already attached Amazon VPC, Amazon Transit Gateway will not propagate the new Amazon VPC route into the Amazon Transit Gateway route table.

Manage overlapping subnet (different VPC) on same TGW

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