Deploy two SAG devices in one-arm mode and enable dynamic routing

Prerequisites

• A virtual private cloud (VPC) is created in the China (Beijing) region. For more information, see Create a VPC.
• A Cloud Enterprise Network (CEN) instance is created and associated with the VPC in the China (Beijing) region. For more information, see Create a CEN instance.

Subnetting

Step 1: Purchase SAG devices

After you purchase SAG devices in the SAG console, Alibaba Cloud delivers the devices to the specified address and creates an SAG instance to help you facilitate network management.

1. Log on to the SAG console.
2. On the Smart Access Gateway page, click Create SAG Instance.
3. 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 SAG devices. No is selected in this example.
   • Quantity: Select the number of SAG devices that you want to purchase. 2 is selected in this example.
   • Area: Select the area where the SAG bandwidth will be used. This area must be the same as that of the SAG devices and cannot be modified.
   • 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.

   • Peak Bandwidth: Specify the maximum bandwidth value. 30Mbps is selected in this example.
   • Subscription Duration: Specify the subscription duration of the bandwidth resources.
4. Confirm the order information and click Confirm Purchase.
5. In the Address dialog box, enter the recipient address and then click Order Now.
6. On the Pay page, click Pay.

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

Step 2: Activate the SAG devices

After you receive the SAG devices, 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. On the Smart Access Gateway page, find the SAG instance.
3. In the Actions column, click Activate.
4. In the Activate dialog box, click OK.
5. Click the ID of the SAG instance. On the instance details page, click the Device Management tab and enter the serial number of the device.
   
6. Click Add Device.
7. Repeat this step to associate the other SAG device with the SAG instance.

Step 3: Connect the SAG devices to your private network

After you activate the SAG devices and associate them with the SAG instance, you must connect the devices to your private network.

Before you begin, make sure that the devices are activated, the 4G networks work as expected, and the devices are connected to Alibaba Cloud. The active device is used in this example. Repeat this step to connect the standby device to your private network.

1. Log on to the SAG console.
2. On the Smart Access Gateway page, find and click the SAG instance ID.
3. On the instance details page, click the Device Management tab.
4. In the left-side navigation tree, click Assign Port Roles.
5. In the Assign Port Roles section, find the port and click Edit in the Actions column. Assign a role to the port and click OK.
   The WAN port (port 5) is used in this example. For more information about ports, see Assign a role to a port.
6. Use a network cable to connect the WAN port (port 5) of the SAG device to port G11 of the Layer 3 switch.

Step 4: Configure ports

After the SAG devices are connected to your private network, you can configure the device ports in the SAG console.

The active device is used in this example. Repeat this step to configure the ports of the standby device.

1. Log on to the SAG console.
2. On the Smart Access Gateway page, click the ID of the SAG instance.
3. On the instance details page, click the Device Management tab.
4. In the left-side navigation tree, click Manage WAN Ports.
5. In the WAN (Port 5) section, click Settings.
6. In the Configure WAN (Port 5) dialog box, set the following parameters and click OK.
   • Connection Type: Select Static IP.
   • 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 used in this example.
   • Gateway: Enter the IP address of the gateway. 192.168.100.2 is used in this example.
     Note After the parameter is set, a default route is added to the SAG device.

Step 5: Configure OSPF-based dynamic routing

You can configure OSPF-based dynamic routing for SAG devices in the SAG console.

The active device is used in this example. Repeat this step to configure OSPF-based dynamic routing for the standby device.

1. Log on to the SAG console.
2. On the Smart Access Gateway page, click the ID of the SAG instance.
3. On the instance details page, click the Device Management tab.
4. In the left-side navigation tree, click Manage Routes.
5. In the OSPF Protocol Settings section, click Edit.
6. In the Configure OSPF Protocol dialog box, enter the information about the allocated IP address and click OK.

   Parameter	Description
   Area ID	Set area IDs as shown before: Area ID of the active device: 1. Area ID of the standby device: 1.
   Hello Time	Set the hello time to 3 seconds for both devices.
   Dead Time	Set the dead time to 10 seconds for both devices.
   Authentication Type	Select Disable Authentication for both devices.
   Router ID	Set router IDs as shown below: Router ID of the active device: 192.168.100.1. Router ID of the standby device: 192.168.200.1.
   Area Type	Default value: NSSA.

7. In the WAN/LAN Dynamic Routing Settings section, select Enable OSPF Protocol.
8. Find Port 5 (WAN), click Edit in the Actions column, select Enable OSPF, and then click OK.

Step 6: Configure the Layer 3 switch and Internet-facing router

• The Layer 3 switch
  • Set the port IP addresses and OSPF parameters.
    Note For each SAG device, the network type of ports that use the OSPF protocol must be set to peer-to-peer (P2P). Otherwise, the SAG device cannot calculate routes correctly.

    
    
    interface GigabitEthernet 0/11
     no switchport
     ip ospf network point-to-point           Set the network type to P2P
     ip ospf hello-interval 3
     ip ospf dead-interval 10
     ip address 192.168.100.2 255.255.255.252   The port IP address of the peer switch of Device 1
     
    
     interface GigabitEthernet 0/13
     no switchport
     ip address 192.168.200.2 255.255.255.252     The port IP address of the peer switch of Device 2
     ip ospf network point-to-point                Set the network type to P2P
     ip ospf dead-interval 10
     ip ospf hello-interval 3
    
    !
    
                                

  • Specify the loopback address and route advertisement information.
    Note OSPF requires a not-so-stubby area (NSSA), automatically generates a default route, and advertises it to SAG.

    
    
    interface Loopback 0
    ip address 192.168.100.3 255.255.255.255                       The loopback address of the switch
    !
    
    router ospf 1
     router-id 192.168.100.3                                     The router ID of the switch
     network 172.16.0.0 0.15.255.255 area 0                        The CIDR block of the on-premises server
     network 192.168.100.0 0.0.0.4 area 1                       The CIDR block of the switch port connected to Device 1
     network 192.168.100.3 0.0.0.0 area 0                        The loopback address of the switch               
     network 192.168.200.0 0.0.0.4 area 1                       The CIDR block of the switch port connected to Device 2              
     area 1 nssa default-information-originate no-summary
    
    !
    
                                

• The Internet-facing router

  Add a static route
  
  ip route 192.168.100.1 255.255.255.252  192.168.80.2 The route to Device 1
  ip route 192.168.200.1 255.255.255.252  192.168.80.2 The route to Device 2

Step 7: Set up network connections

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

1. Create a CCN instance.
   1. Log on to the SAG console.
   2. In the left-side navigation pane, click CCN.
   3. On the CCN page, click Create CCN Instance.
   4. 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.
2. Set up network connections.
   1. Log on to the SAG console.
   2. On the Smart Access Gateway page, click the ID of the SAG instance or click Network Configuration in the Actions column.
   3. On the Method to Synchronize with On-premises Routes tab, select Dynamic Routing.
   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 Cloud Enterprise Network (CEN) instance.
   1. Log on to the SAG console.
   2. In the left-side navigation pane, click CCN.
   3. Find the CCN instance and click Bind CEN Instance in the Actions column.
   4. In the Bind CEN Instance pane that appears, select the CEN instance and click OK.
      After the CCN instance is associated with the CEN instance, SAG devices in the CCN can communicate with VPCs associated with the CEN.
4. Configure a security group rule.
   1. Log on to the ECS console.
   2. In the left-side navigation pane, click Instance.
   3. Find the ECS instance deployed in the VPC and choose More > Network and Security Group > Configure Security Group.
   4. Click Add Rules and then click Add Security Group Rule.
   5. Create a security group rule that allows access from the private network to the VPC.
      The following figure shows how to configure a security group rule. Set Authorization Object to the CIDR block of the private network.

Step 8: 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.