In order to produce AMIs that support desired features, it is important that the AMI used to bootstrap from supports those same features:

For candidate RHEL 7 bootstrap AMIs: ensure that the AMI has a valid billingProducts value set (typically bp-6fa54006). This gives resultant AMIs access to the Red Hat RPM repositories. At this point in time, a way to use the AWS APIs/utilities to pull attribute information directly from an unlaunched AMI has yet to be identified. The only currently-known way is per the notes in this BlogSpot post.
For all EL 7 bootstrap AMIs:
- Ensure that the AMI has SriovNetSupport support enabled. This gives resultant AMIs the ability to produce instances that support 10Gbps networking mode.
```
$ aws --profile <PROFILE_NAME> --region <REGION> ec2 describe-image-attribute --image-id <AMI_ID> \
  --attribute sriovNetSupport
{
    "SriovNetSupport": {
        "Value": "simple"
    },
    "ImageId": "<AMI_ID>"
}
```
- Ensure that the AMI has Elastic Network Adapter (ENA) support enabled. This allows the resultant AMIs (EL 7.4.1708 or newer) to take advantage of instance-types with 20Gbps+ networking mode.
```
$ aws --profile <PROFILE_NAME>  --region <REGION> ec2 describe-images --image-id <AMI_ID> \
  --query 'Images[].EnaSupport'
[
    true
]
```

Note: for AMIs not owned by your account, you likely will not have sufficient permissions to read the AMI's attribute values.

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