Cloud Enterprise Network：Manage access to cloud services

Limits

• VPCs can use only Enterprise Edition transit routers to access cloud services across regions.

• On-premises networks associated with IPsec-VPN connections can use only Enterprise Edition transit routers to access cloud services.

• If a VBR is connected to a Basic Edition transit router, the on-premises networks connected to the VBR can use the Basic Edition transit router to access cloud services in the same region as the VBR.

  For example, a VBR is deployed in the China (Beijing) region. In this case, the on-premises networks connected to the VBR can use the Basic Edition transit router to access cloud services that are also in the China (Beijing) region.

Prerequisites

• The IP address or CIDR block of the cloud service is obtained. You can refer to the documentation of the cloud service to find the IP address or CIDR block.

  For more information about the IP address or CIDR block of Object Storage Service (OSS), see Internal endpoints of OSS buckets and VIP ranges.

• To allow an on-premises network to access cloud services:

  • The VBR, IPsec-VPN connection, or CCN instance used by the on-premises network is connected to the transit router. For more information, see Connect VBRs, Attach an IPsec-VPN connection to a transit router, or Associate a CCN instance with a transit router.

  • A VPC in the region where the cloud services are deployed is connected to the transit router. For more information, see Connect VPCs.

  • If the on-premises network needs to access cloud services across regions, create an inter-region connection between the transit routers. For more information, see Manage inter-region connections.

• To allow a VPC to access cloud services across regions:

  • The VPC is connected to the transit router.

  • A VPC in the region where the cloud services are deployed is connected to a transit router. For more information, see Connect VPCs.

  • An inter-region connection is created between the transit routers in the regions. For more information, see Manage inter-region connections.

Enable access to a cloud service from an Enterprise Edition transit router

Enable access to a cloud service

1. Log on to the CEN console.

2. On the Instances page, click the ID of the CEN instance that you want to manage.

3. On the Basic Settings > Transit Router tab, click the ID of the transit router that resides in the region where the cloud service is deployed.

4. On the details page of the transit router, click the Route Table tab.

5. On the Route Table tab, click the ID of the route table that you want to manage in the left-side list. In the Route Table Details section, click the Route Entry tab, and then click Add Route Entry.

6. In the Add Route Entry dialog box, set the following parameters and click OK.

   Parameter	Description
   Route Table	By default, the current route table is selected.
   Transit Router	By default, the current transit router is selected.
   Name	Enter a name for the route entry.
   Destination CIDR	Enter the IP address or CIDR block that the cloud service uses to provide services. For example, OSS buckets in the China (Hangzhou) region use the CIDR block 100.118.28.0/24.
   Blackhole Route	Select whether to specify the route as a blackhole route. Valid values: Yes: specifies the route as a blackhole route. Traffic that matches the route is dropped. No: specifies that the route is not a blackhole route. In this case, you must specify a next hop for the route. No is selected in this example.
   Next Hop	Select a next hop. Select the ID of the VPC connection on the transit router.
   Description	Enter a description for the route entry.

   Important

   If the cloud service uses more than one IP address or CIDR block, repeat this step to add all the IP addresses or CIDR blocks of the cloud service.

Disable access to a cloud service

1. Log on to the CEN console.

2. On the Instances page, click the ID of the CEN instance that you want to manage.

3. On the Basic Settings > Transit Router tab, click the ID of the transit router that resides in the region where the cloud service is deployed.

4. On the details page of the transit router, click the Route Table tab.

5. On the Route Table tab, click the route table that you want to manage in the left-side list. In the Route Table Details section, click the Route Entry tab and find the route to the cloud service.

6. Then, click Delete in the Actions column. In the Delete Route Entry message, click OK.

Enable access to a cloud service from an Enterprise Edition transit router by calling API operations

You can use tools such as Alibaba Cloud SDKs (recommended), Alibaba Cloud CLI, Terraform, and Resource Orchestration Service (ROS) to call API operations to add and manage routes for an Enterprise Edition transit router. For more information, see the following API references:

• CreateTransitRouterRouteEntry: Adds a route to a route table of an Enterprise Edition transit router.

• DeleteTransitRouterRouteEntry: Removes a static route from a route table of an Enterprise Edition transit router.

References

Use Enterprise Edition transit routers to enable ECS instances to access OSS across regions over VPC connections

Enable access to a cloud service from a Basic Edition transit router

Enable access to a cloud service

1. Log on to the CEN console.

2. On the Instances page, click the ID of the CEN instance that you want to manage.

3. On the Basic Settings > Transit Router tab, click the ID of the transit router that resides in the region where the cloud service is deployed.

4. On the details page of the transit router, click the Cloud Services tab.

5. On the Cloud Services tab, click Configure AnyTunnel.

6. In the Configure AnyTunnel dialog box, configure the parameters and click OK. The following table describes the parameters.

   Parameter	Description
   Service IP Address	Enter the IP address or CIDR block that the cloud service uses to provide services, for example, 100.118.28.0/24.
   Service Region	Select the region where the cloud service is deployed.
   Service VPC	Select the VPC that is connected to the transit router.
   Access Region	Select the region where the VBR or CCN instance that needs to access the cloud service is deployed.
   Description	Enter a description for the cloud service.

   Important

   If the cloud service uses more than one IP address or CIDR block, repeat this step to add all the IP addresses or CIDR blocks of the cloud service.

Disable access to a cloud service

1. Log on to the CEN console.

2. On the Instances page, click the ID of the CEN instance that you want to manage.

3. On the Basic Settings > Transit Router tab, click the ID of the transit router that resides in the region where the cloud service is deployed.

4. On the details page of the transit router, click the Cloud Services tab.

5. On the Cloud Services tab, find the cloud service that you want to manage and click Delete in the Actions column.

6. In the Delete Route Service message, click OK.

Enable access to a cloud service from a Basic Edition transit router by calling API operations

You can use tools such as Alibaba Cloud SDKs (recommended), Alibaba Cloud CLI, Terraform, and Resource Orchestration Service (ROS) to call API operations to add and manage routes for a Basic Edition transit router. For more information, see the following API references:

• ResolveAndRouteServiceInCen: Connects an on-premises network to a cloud service.

• DescribeRouteServicesInCen: Queries the cloud services that are configured on a Cloud Enterprise Network (CEN) instance.

• DeleteRouteServiceInCen: Deletes the configuration of a cloud service.