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After associating a CCN with the direct connect gateway, you need to configure a routing policy for the CCN, with the direct connect gateway as the next hop and IDC IP range as the destination to implement communication. The routing policy can be either manually entered (Static) or automatically synced (BGP). For more information, see Route Overview. This document describes how to publish IP ranges on the direct connect gateway to CCN.

Background

As shown in the following Direct Connect network architecture, your IDC associated with the CCN-based direct connect gateway and CCN can communicate with a Tencent Cloud VPC. The destination IP range of VPC routes to IDC is 192.168.0.0/24. After configuring the IDC IP range on the direct connect gateway, the CCN route table will add a routing policy with the direct connect gateway as the next hop and 192.168.0.0/24 as the destination to realize the route propagation.

Note：

If you configure multiple IDC IP ranges on the direct connect gateway, CCN will forward the route with the longest mask. For more information, see Route Overview.

Prerequisites

You have created a CCN-based direct connect gateway as instructed in Creating Direct Connect Gateway.

Directions

1. Log in to the Direct Connect Gateway console, and click Direct Connect Gateway on the left sidebar.

2. Select a region and VPC at the top of the Direct Connect Gateway page. Click the ID of the target instance to enter its details page.

3. Click Publish IP Range on the details page.
   The IP range published is an IDC IP range that specifies the direct connect gateway route to CCN. After the route is received, CCN will automatically add a route with the direct connect gateway as the next hop and IDC IP range as the destination.

4. (Optional) Associate a CCN instance.
   If you did not specify a CCN instance when creating the direct connect gateway, click Associate with CCN, select a CCN instance to be associated in the pop-up window, and click OK.
   
   Then the CCN instance will be associated and the CCN icon becomes green. The dotted line between direct connect gateway and CCN changes to solid, indicating their interconnection.

5. Create a dedicated tunnel.
   A dedicated tunnel is the network segmentation of a connection. It provides a linkage of IDC to Tencent Cloud.
   Under the Dedicated Tunnels icon connected to the direct connect gateway, click Create Dedicated Tunnel. Then, a page for creating a dedicated tunnel is displayed, and you can configure dedicated tunnel settings on this page.
   For more information on the parameter configurations, see Creating a Dedicated Tunnel.
   Then the dedicated tunnel is created and the Dedicated Tunnels icon becomes green. The dotted line between direct connect gateway and dedicated tunnel changes to solid, indicating the direct connect gateway is configured with a dedicated tunnel.

6. Publish IDC IP ranges to CCN.
   After an IDC IP range is published to CCN, the CCN route is synced to the direct connect gateway, while the direct connect gateway route to CCN can be obtained depending on the publishing method of the IDC IP range.

   • Custom: the manual configuration mode. CCN obtains the specified direct connect gateway route.
   • Auto-propagation: the BGP mode. CCN automatically obtains the direct connect gateway route published from the dedicated tunnel. But the publish time of the dedicated tunnel matters.
     • Custom
     • Auto-propagation
     • Switching

     Formerly named Static or manual configuration.

     1. (Optional) Select a CCN instance in the Publish Rules section.
        Perform this step if you want to associate one CCN instance with the direct connect gateway or change the associated CCN instance.

        Note

        The Publishing method defaults to Custom. To switch to Auto-propagation, please submit a ticket.

     2. Select the Custom tab on the IP Range Details page, click Create, enter the gateway information to publish to CCN, and click Save.

        Then the direct connect gateway will publish the IDC IP range you entered to CCN.
        

        Note

        Up to 100 IDC IP ranges can be published. To publish more IDC IP ranges, please submit a ticket.

     Formerly named BGP mode. To use it, please submit a ticket.

     1. (Optional) Select a CCN instance in the Publish Rules section.
        Perform this step if you want to associate one CCN instance with the direct connect gateway or change the associated CCN instance.

        Note

        • The Auto-propagation is selected after this feature is enabled. If needed, you can check Custom and complete the relevant configurations.
        • Either custom or auto-propagation can be checked.

     2. Configure IDC IP ranges.
        The direct connect gateway automatically obtains the IDC IP range without needing configuration.
        

        Note

        Publishing IDC IP ranges may be delayed for one minute. If there are any updates on the IDC IP range, please refresh the current page.

     You can switch between the two methods for publishing the IDC IP ranges on the direct connect gateway to CCN.

     • Switching to auto-propagation
       Submit a ticket to enable the auto-propagation feature.
       The custom IP ranges published to CCN will be withdrawn after switching. IDC IP ranges will be automatically synced from the direct connect gateway and published to CCN.
     • Switching to custom
       Configure IP ranges to be published to CCN in the Custom tab on the IP Range Details page after switching.

7. View the published IDC IP ranges.
   The published IDC IP ranges will be shown on the IP Range Details page.