Command option Sample:aws ec2 associate-vpc-cidr-block

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Associates a CIDR block with your VPC.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/ec2/associate-vpc-cidr-block.html

aws ec2 associate-vpc-cidr-block --amazon-provided-ipv6-cidr-block --vpc-id
    Enabling IPv6 on existing VPCs and subnets – cloudiamo.com : http://cloudiamo.com/2017/02/14/enabling-ipv6-on-existing-vpcs-and-subnets/
aws ec2 associate-vpc-cidr-block --amazon-provided-ipv6-cidr-block --vpc-id vpc-a034d6c4
    disassociate-vpc-cidr-block — AWS CLI 1.16.6 Command Reference : http://docs.aws.amazon.com/cli/latest/reference/ec2/associate-vpc-cidr-block.html

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