Cloudformation BgpAsn on AWS::EC2::CustomerGateway

Question

Hi Folks,
I'm trying to create a site-to-site VPN using cloud formation template.
when I try to create a customer gateway using AWS::EC2::CustomerGateway, on of the properties BgpAsn. According to the documentation, BgpAsn is not required. But when I don't include BgpAsn, the customer gateway creation failed.
Thanks for all the help

Riku_Kobayashi · Answer

Hello.

The parameter description is as follows:  
I haven't seen the CloudFormation template you're using, so I can't say for sure, but aren't you trying to create it without also specifying "BgpAsnExtended"?  
https://docs.aws.amazon.com/ja_jp/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-customergateway.html#cfn-ec2-customergateway-bgpasn  
> For customer gateway devices that support BGP, specify the device's ASN. You must specify either BgpAsn or BgpAsnExtended when creating the customer gateway. If the ASN is larger than 2,147,483,647, you must use BgpAsnExtended.

Cloudformation BgpAsn on AWS::EC2::CustomerGateway

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