# Edit an AWS Transit Gateway metering policy
<a name="metering-policy-edit"></a>

Edit existing metering policies to modify middlebox attachment configurations. Policy modifications take effect at the next billing hour and apply to all future traffic flows through your transit gateway.

## Edit a metering policy using the console
<a name="edit-metering-policy-console"></a>

Use the console to modify existing metering policy settings for your transit gateway.

**To edit an existing metering policy using the console**

1. Open the Amazon VPC console at [https://console.aws.amazon.com/vpc/](https://console.aws.amazon.com/vpc/).

1. In the navigation pane, choose **Metering policies**.

1. Select the metering policy you want to modify by choosing its policy ID

1. Modify the available policy settings under **Actions**. Console only allow add and remove of Middle box attachments.

   1. **Middlebox attachments** - Add or remove transit gateway attachments that should be treated as middleboxes for specialized billing.

## Edit a metering policy using the AWS CLI
<a name="edit-metering-policy-cli"></a>

Use the **modify-transit-gateway-metering-policy** command to view and modify metering policies.

Required parameters for modify operations:
+ `--transit-gateway-metering-policy-id` - The ID of the metering policy to modify
+ `--add-middle-box-attachment-ids` or `--remove-middle-box-attachment-ids` - Supported transit gateway attachment Ids to add or remove from the policy as middlebox

**To view and edit metering policies using the AWS CLI**

1. (Optional) View existing metering policies using the **describe-transit-gateway-metering-policies** command to see current configuration settings:

   ```
   aws ec2 describe-transit-gateway-metering-policies
   ```

   This command returns all metering policies in your account, showing their current state, and attachments enabled as middlebox for each of the metering policy.

1. Modify a metering policy using the **modify-transit-gateway-metering-policy** command to update configuration options:

   ```
   aws ec2 modify-transit-gateway-metering-policy \
       --transit-gateway-metering-policy-id tgw-mp-042d444564d4b2da7 \
       --add-middle-box-attachment-ids tgw-attach-0123456789abcdef1  \
       --remove-middle-box-attachment-ids tgw-attach-0abc123def456789a
   ```

   This command modifies a metering policy by adding and/or removing middlebox attachments.

1. The command returns the following output when the policy is successfully modified:

   ```
   {
       "TransitGatewayMeteringPolicy": {
           "TransitGatewayMeteringPolicyId": "tgw-mp-042d444564d4b2da7",
           "TransitGatewayId": "tgw-07a5946195a67dc47",
           "MiddleboxAttachmentIds":  ["tgw-attach-0123456789abcdef0", 
           "tgw-attach-0123456789abcdef1"],
           "State": "modifying",
           "UpdateEffectiveAt": "2025-11-05T21:00:00.000Z"
       }
   }
   ```

   The changes can take up to two billing hours to take effect.