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It would be something like this:

new awsx.ec2.Vpc("vpc", {
        cidrBlock: "your_desired_cidr",
        numberOfAvailabilityZones: 3,
        numberOfNatGateways: 3,
        subnets: [
            {
                type: "public",
            },
            {
                type: "private"
            }]
    });

Let us know if you need the above in a different language.

After I run that code. It still shown 1 subnet 1 route(unexpect)

@few-mechanic-54967 Try removing the

subnets

section; I think the default is to create both private and public subnets, and I suspect that

subnets

section is being interpreted to create one public and one private.

The result still same. Have you look to deep awsx code?, there is loop 1 subnet 1 route tables, so I think it is impossible to group 3 subnet to 1 route table only.

Why does the number of route tables matter, if the routes are configured correctly?

that's why there is a subnet associate if the purpose is, among other things, to group.

If you want more explicit control over route tables and route table associations, then I’d stick with using AWS instead of AWSx.

Agree