aws-ec2: Filter subnets by CIDR Range

[AlemanCS]

Describe the feature

I would like the ability to filter a SubnetSelection based on a CIDR range in a VPC. While SubnetFilter does allow to filter by CIDR mask and IP address, a VPC can have multiple CIDR Ranges associated with it and the CIDR masks can be the same while the range can be different.

Use Case

I would like this feature because some of the VPCs I have worked with have 2 or more CIDR Ranges associated and the current subnet filter options don't really work unless I filter by Id.

Simple Example:

VPC A can have CIDR ranges: 10.2.0.0/16 and 100.64.0.0/16

Its subnets can be as follows:

Subnet A: 10.2.0.0/18
Subnet B: 10.2.64.0/18
Subnet C: 100.64.0.0/18
Subnet D: 100.64.64.0/18

I want to only use the subnets under the 10.2.0.0/16 CIDR range.

Proposed Solution

I think the feature would look something like this

const subnetsByCidrRanges: SubnetSelection = {
      subnetFilters: [SubnetFilter.byCidrRanges([10.2.0.0/16])]
    }

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.93.0

Environment details (OS name and version, etc.)

Mac OS

[peterwoodworth]

Thanks for the request, this makes sense and I can see how it would be useful 🙂

Be sure to check out our contributing guide, we will likely rely on contributor support for this feature

[github-actions]

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