def get_describe_filters(self):
        vpc = self.runner.get_plan(self.resource.vpc)
        if not vpc.resource_id:
            return None

        return {
            "Filters": [
                {"Name": "cidrBlock", "Values": [str(self.resource.cidr_block)]},
                {"Name": "vpcId", "Values": [vpc.resource_id]},
            ]
        }