# CloudWatchNetworkFlowMonitorTopologyServiceRolePolicy
<a name="CloudWatchNetworkFlowMonitorTopologyServiceRolePolicy"></a>

**Description**: You can't attach CloudWatchNetworkFlowMonitorTopologyServiceRolePolicy to your IAM entities. This policy is attached to a service-linked role named AWSServiceRoleForNetworkFlowMonitor\$1Topology, which generates topology snapshots of resources used by Network Flow Monitor in your account.

`CloudWatchNetworkFlowMonitorTopologyServiceRolePolicy` is an [AWS managed policy](https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_managed-vs-inline.html#aws-managed-policies).

## Using this policy
<a name="CloudWatchNetworkFlowMonitorTopologyServiceRolePolicy-how-to-use"></a>

This policy is attached to a service-linked role that allows the service to perform actions on your behalf. You cannot attach this policy to your users, groups, or roles.

## Policy details
<a name="CloudWatchNetworkFlowMonitorTopologyServiceRolePolicy-details"></a>
+ **Type**: Service-linked role policy 
+ **Creation time**: December 01, 2024, 22:51 UTC 
+ **Edited time:** February 12, 2026, 17:57 UTC
+ **ARN**: `arn:aws:iam::aws:policy/aws-service-role/CloudWatchNetworkFlowMonitorTopologyServiceRolePolicy`

## Policy version
<a name="CloudWatchNetworkFlowMonitorTopologyServiceRolePolicy-version"></a>

**Policy version:** v9 (default)

The policy's default version is the version that defines the permissions for the policy. When a user or role with the policy makes a request to access an AWS resource, AWS checks the default version of the policy to determine whether to allow the request. 

## JSON policy document
<a name="CloudWatchNetworkFlowMonitorTopologyServiceRolePolicy-json"></a>

```
{
  "Version" : "2012-10-17",
  "Statement" : [
    {
      "Effect" : "Allow",
      "Action" : [
        "ec2:DescribeTransitGatewayAttachments",
        "ec2:DescribeTransitGatewayConnects",
        "ec2:DescribeTransitGatewayPeeringAttachments",
        "ec2:DescribeTransitGatewayRouteTables",
        "ec2:DescribeTransitGateways",
        "ec2:DescribeTransitGatewayVpcAttachments",
        "ec2:DescribeVpnConnections",
        "ec2:DescribeCustomerGateways",
        "ec2:GetTransitGatewayRouteTableAssociations",
        "ec2:GetTransitGatewayRouteTablePropagations",
        "ec2:SearchTransitGatewayRoutes"
      ],
      "Resource" : "*"
    },
    {
      "Sid" : "PrefixListStatement",
      "Effect" : "Allow",
      "Action" : [
        "ec2:DescribeManagedPrefixLists",
        "ec2:GetManagedPrefixListEntries"
      ],
      "Resource" : "*"
    },
    {
      "Sid" : "VPCEndpointStatement",
      "Effect" : "Allow",
      "Action" : [
        "ec2:DescribeVpcEndpoints",
        "ec2:DescribeVpcEndpointServiceConfigurations"
      ],
      "Resource" : "*"
    }
  ]
}
```

## Learn more
<a name="CloudWatchNetworkFlowMonitorTopologyServiceRolePolicy-learn-more"></a>
+ [Understand versioning for IAM policies](https://docs.aws.amazon.com//IAM/latest/UserGuide/access_policies_managed-versioning.html)
+ [Get started with AWS managed policies and move toward least-privilege permissions](https://docs.aws.amazon.com//IAM/latest/UserGuide/best-practices.html#bp-use-aws-defined-policies)