If the public bandwidth configurations of a subscription Elastic Compute Service (ECS) instance that uses a public IP address are not suitable for your business requirements, you can modify the public bandwidth configurations.

Prerequisites

Before you can use the downgrade feature to downgrade the fixed bandwidth of an instance or modify the peak bandwidth of an instance, make sure that your account has been granted the privilege to perform configuration downgrades. A fixed bandwidth is a specified amount of public bandwidth allocated to an instance that uses the pay-by-bandwidth billing method for network usage. A peak bandwidth is the maximum amount of public bandwidth that an instance can have when it uses the pay-by-traffic billing method for network usage.
Note You can click Privileges on the Overview page in the ECS console to go to the Privileges and Quotas page and check whether your account has been granted the privilege to perform configuration downgrades.

Background information

You can modify the fixed or peak bandwidth of an instance based on its billing method for network usage.
  • For instances that use the pay-by-bandwidth billing method for network usage, you can upgrade or downgrade their fixed bandwidths. For more information, see Upgrade fixed bandwidths or Downgrade fixed bandwidths.
    Note A bandwidth downgrade may result in a refund. The following formula is used to calculate the refund amount: Refund amount = Remaining amount of the price of the original configurations - Price of the new configurations. Up to three refunds can be made for each subscription instance. A refund is made if you downgrade the instance type or bandwidth or change the billing method of a disk from subscription to pay-as-you-go.
  • For instances that use the pay-by-traffic billing method for network usage, you can modify their peak bandwidths. For more information, see Modify peak bandwidths.
When you modify the bandwidth configurations of an ECS instance, take note of the following limits:
  • Your ECS usage determines whether the bandwidths of your instances can be downgraded.
  • The bandwidth configurations of an instance can be modified multiple times, but you must wait at least 5 minutes between two consecutive bandwidth configuration modifications on the same instance.

This topic describes how to modify the bandwidth configurations of a subscription instance that uses a public IP address. For more information about how to modify the bandwidth configurations of a subscription instance that uses an elastic IP address (EIP), see Modify the bandwidth of an EIP.

Upgrade fixed bandwidths

For instances that use the pay-by-bandwidth billing method for network usage, you can perform the following operations to upgrade their fixed bandwidths.

Note If you did not assign a public IP address an instance when the instance was created, the instance has no public bandwidth. You can assign a public IP address to the instance by upgrading the fixed bandwidth of the instance from 0 Mbit/s to a non-zero value.
  1. Log on to the ECS console.
  2. In the left-side navigation pane, choose Instances & Images > Instances.
  3. In the top navigation bar, select a region.
  4. Use one of the following methods to go to the bandwidth upgrade page based on the number of instances whose fixed bandwidths you want to upgrade:
    • Upgrade the fixed bandwidth of a single instance at a time
      1. Find the subscription instance whose fixed bandwidth you want to upgrade and click Upgrade/Downgrade in the Actions column.
      2. In the Upgrade/Downgrade Wizard dialog box, select Upgrade and click Continue.
    • Upgrade the fixed bandwidths of multiple instances at a time
      1. Select the subscription instances whose fixed bandwidths you want to upgrade. In the lower part of the Instances page, choose More > Configuration Change > Change Subscription Instance Bandwidth.
      2. In the dialog box that appears, select Upgrade Bandwidth and click Continue.
  5. On the page that appears, specify a new bandwidth in the Bandwidth section.
    When you upgrade the fixed bandwidths of multiple instances at a time, instances are filtered out if they are not associated with a public IP address or if they do not use the pay-by-bandwidth billing method for network usage. You can continue to upgrade bandwidths only for the eligible instances, as shown in the following figure. Upgrade the fixed bandwidths of multiple instances at a time
  6. Read the notes. Read and select ECS Service Terms.
  7. Check the configuration costs, click Upgrade or Create Order in the lower part of the page, and perform the subsequent operations as instructed.
    Note The first time you upgrade the fixed bandwidth of an instance in the classic network from 0 Mbit/s to a non-zero value, you must restart the instance by using the ECS console or by calling the RebootInstance operation for the new bandwidth to take effect.

Downgrade fixed bandwidths

For instances that use the pay-by-bandwidth billing method for network usage, you can perform the following operations to downgrade their fixed bandwidths.

  1. Log on to the ECS console.
  2. In the left-side navigation pane, choose Instances & Images > Instances.
  3. In the top navigation bar, select a region.
  4. Use one of the following methods to go to the bandwidth downgrade page based on the number of instances whose fixed bandwidth you want to downgrade:
    Notice Bandwidth downgrade operations can downgrade only the baseline bandwidths of instances.
    • Downgrade the fixed bandwidth of a single instance at a time
      1. Find the subscription instance whose fixed bandwidth you want to downgrade and click Upgrade/Downgrade in the Actions column.
      2. In the Upgrade/Downgrade Wizard dialog box, choose Downgrade > Bandwidth Configuration, and then click Continue.
    • Downgrade the fixed bandwidths of multiple instances at a time
      1. Select the subscription instances whose fixed bandwidths you want to downgrade. In the lower part of the Instances page, choose More > Configuration Change > Change Subscription Instance Bandwidth.
      2. In the dialog box that appears, select Downgrade Bandwidth and click Continue.
  5. On the page that appears, specify a new bandwidth in the Bandwidth section.
    When you downgrade the fixed bandwidths of multiple instances at a time, instances are filtered out if they are not associated with a public IP address or if they do not use the pay-by-bandwidth billing method for network usage. You can continue to downgrade bandwidths only for the eligible instances, as shown in the following figure. Downgrade the fixed bandwidths of multiple instances at a time
    Note
    • If you downgrade the fixed bandwidth of an instance in the classic network to 0 Mbit/s, the public IP address of the instance is retained. If you downgrade the fixed bandwidth of an instance in a virtual private cloud (VPC) to 0 Mbit/s, the public IP address of the instance is released.
    • You can select Pay-By-Traffic to change the billing method for network usage to pay-by-traffic and specify a peak bandwidth.
  6. Read the notes. Read and select ECS Service Terms.
  7. Check the refund amount, click Downgrade Now, and then perform the subsequent operations as instructed.
    Note After you downgrade the fixed bandwidths of instances, you do not need to restart the instances for the new configurations to take effect.

Modify peak bandwidths

For instances that use the pay-by-traffic billing method for network usage, you can perform the following operations to modify their peak bandwidths.

Note When pay-by-traffic is used as the billing method for network usage, you are charged based on the actual volume of traffic. If you modify only peak bandwidths, the configuration costs remain unchanged. A peak bandwidth is the upper limit placed on the outbound bandwidth of an instance to prevent unexpected high fees caused by traffic bursts.
  1. Log on to the ECS console.
  2. In the left-side navigation pane, choose Instances & Images > Instances.
  3. In the top navigation bar, select a region.
  4. Use one of the following methods to modify the peak bandwidths of instances:
    • Modify the peak bandwidth of a single instance at a time
      1. Find the subscription instance whose peak bandwidth you want to modify and click Upgrade/Downgrade in the Actions column.
      2. In the Upgrade/Downgrade Wizard dialog box, select one of the following options and click Continue:
        • Upgrade: allows you to modify the peak bandwidth or change the billing method for network usage to pay-by-bandwidth.
        • Downgrade > Bandwidth Configuration: allows you only to modify the peak bandwidth.
    • Modify the peak bandwidths of multiple instances at a time
      1. Select the subscription instances whose peak bandwidths you want to modify. In the lower part of the Instances page, choose More > Configuration Change > Change Subscription Instance Bandwidth.
      2. In the dialog box that appears, select Modify Peak Bandwidth Value and click Continue.
  5. On the page that appears, specify a new peak bandwidth in the Bandwidth section.
    When you modify the peak bandwidths of multiple instances at a time, instances are filtered out if they are not associated with a public IP address or if they do not use the pay-by-traffic billing method for network usage. You can continue to modify peak bandwidths for only the eligible instances, as shown in the following figure. Modify the peak bandwidths of multiple instances at a time
    Note
    • If you downgrade the peak bandwidth of an instance in the classic network to 0 Mbit/s, the public IP address of the instance is retained. If you downgrade the peak bandwidth of an instance in a VPC to 0 Mbit/s, the public IP address of the instance is released.
    • You can select Pay-By-Bandwidth to change the billing method for network usage to pay-by-bandwidth and specify a bandwidth.
  6. Read the notes. Read and select ECS Service Terms.
  7. Click the button in the lower part of the page and perform the subsequent operations as instructed.
    Note
    • If you change the billing method for network usage from pay-by-traffic to pay-by-bandwidth, you must pay for the fixed bandwidth upfront.
    • The first time you upgrade the peak bandwidth of an instance in the classic network from 0 Mbit/s to a non-zero value, you must restart the instance by using the ECS console or by calling the RebootInstance operation for the new configurations to take effect.