After you create a dedicated tunnel connected to different Direct Connect gateways, you can change the tunnel parameters in the Direct Connect Console. This document describes how to do so.

Prerequisites

You need to apply for a tunnel before you can modify it.

Directions

1. Log in to the Direct Connect Console.
2. On the "Dedicated Tunnel" page, find the tunnel whose parameters need to be changed, and select More > Tunnel Change in the "Operation" column on the right.
3. In the "Tunnel Change" pop-up window, you can change the following parameters:
   • Bandwidth cap: changing the bandwidth cap will not interrupt the business, and the system will automatically overwrite the original configuration.

     Note：

     In the shared connection mode, you cannot apply for a bandwidth change for a dedicated tunnel; instead, such a change can only be applied for by the connection owner.

   • Tencent Cloud Perimeter IP: changing the Tencent Cloud perimeter IP will interrupt the business.
   • Secondary Tencent Cloud Perimeter IP: changing the secondary Tencent Cloud perimeter IP will interrupt the business.
   • User Perimeter IP: changing the user perimeter IP will interrupt the business.
   • User IDC IP Range (Static Routing): you can modify the user IDC IP range. After the modification is completed, the system will automatically deliver the new configuration.
   • BGP ASN (BGP Routing): changing the BGP ASN will interrupt the business.
   • BGP Key (BGP Routing): changing the BGP key will not interrupt the business, and the system will automatically overwrite the original configuration.

     Note：

     The BGP key cannot contain ?, &, space, ", , and +.

4. After changing the parameters, click OK.

   Note：

   After the tunnel change request is submitted, the system will complete the device configuration within a few minutes (subject to the network conditions).

Use Limits on Large IP Range

To ensure the fine-grained scheduling capability of your network, do not publish the following routes:
9.0.0.0/8, 1,0.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 100.64.0.0/10, 131.87.0.0/16, 172.16.0.0/12, 192.168.0.0/16.

Note：

If a large IP range route is published, the direct connect gateway will directly reject it.

You can split the above routes as follows for distribution:

• 9.0.0.0/8
  should be split into 9.0.0.0/9 + 9.128.0.0/9.
• 10.0.0.0/8
  should be split into 10.0.0.0/9 + 10.128.0.0/9.
• 172.16.0.0/12
  should be split into 172.16.0.0/13 + 172.24.0.0/13.
• 192.168.0.0/16
  should be split into 192.168.0.0/17 + 192.168.128.0/17.
• 100.64.0.0/10
  should be split into 100.64.0.0/11 + 100.96.0.0/11.
• 131.87.0.0/16
  should be split into 131.87.0.0/17 + 131.87.128.0/17.
• 172.16.0.0/12
  should be split into 172.16.0.0/13 + 172.24.0.0/13.
• 192.168.0.0/16
  should be split into 192.168.0.0/17 + 192.168.128.0/17.