You can downgrade the public bandwidth of subscription instances.


An instance can be downgraded only when it meets the following conditions:
  • The billing method of the instance is subscription.
  • The instance is in the Running or Stopped state.
  • The instance has no ongoing downgrade or renewal process.

Background information

A real-time downgrade may result in a refund. The refund amount is calculated based on the following formula: Refund amount = Remaining amount of the configuration fee before the downgrade - Price of the new configurations.

You can use the real-time bandwidth downgrade feature to perform the following operations:
  • If the current bandwidth billing method is Pay-By-Bandwidth, you can perform the following operations:
    • Lower the fixed bandwidth.
    • Change the billing method to Pay-By-Traffic and set the peak bandwidth.
  • If the current bandwidth billing method is Pay-By-Traffic, you can change the peak bandwidth. However, you cannot change the billing method to Pay-By-Bandwidth.
    Note If you lower the bandwidth of a VPC-type instance to 0 Mbit/s, its public IP address will be detached.
When you downgrade the bandwidth, the following limits apply:
  • Whether the bandwidth of a subscription instance can be downgraded is determined by your ECS instance usage.
  • You can downgrade only one subscription instance at a time.
  • Each subscription instance can be downgraded on a real-time basis for a maximum of three times. Real-time downgrade operations include instance specifications downgrades, bandwidth configurations downgrades, and the change of the disk billing method from subscription to pay-as-you-go.
  • The interval between two real-time downgrade operations must be at least five minutes.
  • If a VPC-type instance has an EIP associated, its bandwidth configurations cannot be downgraded.

For more information about how to upgrade the bandwidth of a subscription instance, see Upgrade configurations of Subscription instances.


  1. Log on to the ECS console.
  2. In the left-side navigation pane, choose Instances & Images > Instances.
  3. Find the target instance and click Upgrade/Downgrade in the Actions column.
  4. In Upgrade/Downgrade Wizard dialog box that appears, click Downgrade, select Bandwidth Configuration, and then click Continue.
  5. Set the bandwidth, and then read and select ECS Service Terms .
  6. Click Downgrade Now.
    Note The downgrade takes effect immediately. You do not need to restart your instance.