Deploy an SAG device in one-arm mode and enable dynamic routing

Subnetting

The following CIDR blocks are used in this example. When you allocate CIDR blocks based on your actual requirements, make sure that the CIDR blocks do not overlap with each other.

Procedure

Step 1: Purchase an SAG device

After you place an order in the SAG console, Alibaba Cloud delivers the SAG device to the specified address and creates an SAG instance to facilitate the management of the device.

1. Log on to the SAG console.
2. On the Smart Access Gateway page, click Purchase SAG.
3. Select Create SAG (CPE).
4. Set the following parameters and click Buy Now:
   • Area: Select the area where the SAG devices will be deployed. Mainland China is selected in this example.
   • Device Spec: Select the model of the SAG device. SAG-1000 is selected in this example.
   • Have SAG Devices Already: Select whether you already have an SAG device. No is selected in this example.
   • Edition: Select the edition of the SAG device. Standard is selected in this example by default.
   • Quantity: Select the number of SAG devices that you want to purchase. 1 is selected in this example.
   • Area: Select the area where the bandwidth will be used. The area is the same as that of the SAG device and cannot be changed.
   • Name: Specify a name for the SAG instance.

     The name must be 2 to 128 characters in length, and can contain digits, periods (.), hyphens (-), and underscores (_). It must start with a letter or a Chinese character.

   • Peak Bandwidth: Specify the maximum bandwidth value. 50 Mbps is specified in this example.
   • Subscription Duration: Specify the subscription duration of the bandwidth resources.
5. Confirm the order information and click Confirm Purchase.
6. In the Shipping Address dialog box, enter the recipient address and click Buy Now.
7. On the Pay page, select a payment method and complete the payment.

You can check whether the order has been placed on the Smart Access Gateway page. After the order is placed, it will be shipped within two business days. If your order is not shipped as expected, you can submit a ticket to query the shipping status.

Step 2: Activate the SAG devices

After you receive the SAG device, check whether you have received all the accessories. For more information, see Descriptions of an SAG-1000 device.

1. Log on to the SAG console.
2. In the top navigation bar, select the area of the SAG device.
3. On the Smart Access Gateway page, find the SAG instance created for the SAG device.
4. In the Actions column, click Activate.
5. In the Activate dialog box, click OK.
6. After the SAG device is activated, connect it to the private network based on the preceding network topology.
   Use a network cable to connect the WAN port (port 5) of the SAG device to port G11 of the Layer 3 switch.
7. Optional:If the SAG device was purchased from a third-party vendor, you must manually associate the SAG device with the SAG instance. For more information, see Add a device.

Step 3: Configure the SAG device

After you connect the SAG device, you can configure the ports and routing for the SAG device in the SAG console.

Before you begin, make sure that the device is activated, the 4G network works as expected, and the device is connected to Alibaba Cloud.

1. Configure the WAN port.
   1. On the Smart Access Gateway page, click the ID of the SAG instance that is associated with the SAG device.
   2. On the instance details page, click the Device Management tab.
   3. In the left-side navigation tree, click Manage WAN Ports.
   4. In the WAN (Port 5) section, click Edit.
   5. In the Configure WAN (Port 5) dialog box, set the following parameters and click OK.
      

      • Connection Type: Select Static IP.
      • Priority: 1 is selected by default.
      • IP Address: Enter the IP address of the WAN port. 192.168.100.1 is used in this example.
      • Subnet Mask: Enter the subnet mask of the WAN port IP address. 255.255.255.252 is entered in this example.
      • Gateway: Enter the IP address of the gateway. 192.168.100.2 is entered in this example.
        Note After the gateway is configured, the SAG device automatically adds a default route.
2. Advertise routes to Alibaba Cloud
   After you configure the WAN and LAN ports of the SAG device, you must also configure the routing method that synchronizes on-premises routes with Alibaba Cloud.
   1. On the instance details page, click the Network Configuration tab.
   2. In the left-side navigation tree, click Methods to Synchronize with On-premises Routes.
   3. Select Static Routing, click Add Static Route to add a CIDR block, and then click OK.

      Enter the CIDR block used to route network traffic from Alibaba Cloud to the private network. 172.16.0.0/12 is used in this example.

      

Step 4: Configure switches and Internet-facing routers

In this step, you must configure the peer switch and Internet-facing router for the SAG device. Switches and routers used in this example may be different from yours. For more information, see the manuals issued by your providers.

1. Configure routes for the Layer 3 switch.

   
   interface GigabitEthernet 0/11
   no switchport
   ip address 192.168.100.2 255.255.255.252 #The IP address of the peer switch of the SAG device  
   
   
   ip route 10.0.0.0 255.255.0.0 192.168.100.1 #The route to the VPC in the China (Beijing) region
    
   ip route 0.0.0.0 0.0.0.0 192.168.80.1 #The route to the Internet       
   
                   

2. Configure routes for the Internet-facing router.

   
   ip route 192.168.100.0 255.255.255.252 192.168.80.2 #The route to the SAG device
   
                   

Step 5: Set up network connections

After you configure the SAG device, you must set up network connections to connect the private network to Alibaba Cloud.

1. Create a Cloud Connect Network (CCN) instance.
   1. Log on to the SAG console.
   2. In the top navigation bar, select Mainland China.
      The area of the CCN instance must be the same as that of the SAG device.
   3. In the left-side navigation pane, click CCN.
   4. On the CCN page, click Create CCN Instance.
   5. In the Create CCN Instance pane, specify a name for the CCN instance and click OK.
      The name must be 2 to 100 characters in length, and can contain digits, underscores (_), and hyphens (-). It must start with a letter or a Chinese character.
2. Associate the SAG instance with the CCN instance.
   1. In the left-side navigation pane, click Smart Access Gateway.
   2. On the Smart Access Gateway page, find the SAG instance that you want to manage and click Network Configuration in the Actions column.
   3. In the left-side navigation tree, click Network Instance Details.
   4. On the Network Instance Details tab, click Attach Network, select the CCN instance, and then click OK.
      
3. Associate the CCN instance with a CEN instance.
   After the CCN instance is associated with a CEN instance, SAG devices associated with the CCN instance can communicate with VPC networks associated with the CEN instance.
   1. In the left-side navigation pane, click CCN.
   2. Find the CCN instance and click Bind CEN Instance in the Actions column.
   3. In the Bind CEN Instance pane, select Existing CEN, select the CEN instance that you want to associate with the CCN instance, and then click OK.
      
4. Create a security group rule.
   You must create a security group rule for the Elastic Compute Service (ECS) instance in the VPC network to allow clients in the CIDR block 172.16.0.0/12 of the private network to access resources deployed on the ECS instance. For more information, see Add security group rules.

Step 6: Test the connectivity

After you complete the configurations in the preceding steps, access cloud resources deployed in the VPC from a client in your private network to test the connectivity.