# Redundant Connection Access

#### Scenarios

A local data center is connected to a VPC through a connection. To prevent a single connection failure from affecting services, you are advised to create two connections with different access locations. If a connection fails, services are switched to the other connection quickly. Therefore, the communication between the local data center and the VPC is of high quality and high reliability.

Figure 1 Redundant connection access

#### Operation Flowchart

You need to create two connections, with one connecting to Biere and the other to Magdeburg. Create a virtual gateway and access the VPC to which the services belong. Create two virtual interfaces and connect them to the same virtual gateway associated with the target VPC. Figure 2 shows how to create a redundant connection.

Figure 2 Flowchart for creating a redundant connection

#### Procedure

Creating a Connection

1. Log in to the management console.
2. Click in the upper left corner and select a region and a project.
3. Under Network, click Direct Connect.
4. In the navigation pane of Network Console, choose Direct Connect > Connections.
5. On the displayed Connections page, click Create Connection in the upper right corner to create the first connection.
6. Follow the prompts to set the following parameters.

   Table 1 Connection parameters
   Parameter | Description | Example Value
   --- | --- | ---
   Region | Specifies the region in which the services will be handled. If you already selected a region and a project on the management console, you do not need to select the region here. | eu-de
   Name | Specifies the connection name. It can contain 1 to 64 characters. Only digits, letters, underscores (_), and hyphens (-) are allowed. | dc-123
   Location | Specifies the connection access location. You can select Biere or Magdeburg. The access location of the first connection must be different from that of the second connection. | Biere
   Peering Position | Specifies the physical location of the connection. The address is an identifier. Only letters, digits, underscores (_), and hyphens (-) are allowed. It can contain 0 to 64 characters. | "Marderbug-DC01"
   Bandwidth | Specifies the bandwidth size in the unit of Mbit/s. You can select one of the bandwidths provided on the scroll bar by dragging it. Also, typing a value in the input field is allowed. It is automatically changed to the next allowed value shown on the slider bar. | 100
   Description | Provides supplementary information about the connection. It can contain 0 to 128 characters. | This is a connection.

7. Click Create Now, confirm the connection details, and click Submit.
   - Click Back to Connection List to view the created connections.
   - After clicking Submit, you will be automatically redirected to the connection list after a timeout.
8. Repeat step 4 to step 7 to create the second connection.

Creating a Virtual Gateway

1. In the navigation pane on the left, choose Direct Connect > Virtual Gateways.
2. In the upper right corner of the Virtual Gateways page, click Create Virtual Gateway.
3. Follow the prompts to set the following parameters.

   Table 2 Virtual gateway parameters
   Parameter | Description | Example Value
   --- | --- | ---
   Name | Specifies the virtual gateway name. It can contain 1 to 64 characters. Only digits, letters, underscores (_), and hyphens (-) are allowed. | vgw-123
   VPC | Specifies the VPC that you need to access. | VPC-001
   CIDR Block | Specifies the CIDR network segment of the VPC to be accessed by the direct connection. You can add a maximum of 50 CIDR blocks. Each pair must be unique. Separate every two CIDR blocks with commas (,). | 192.168.0.0/16
   Description | Provides supplementary information about the virtual gateway. It can contain 0 to 128 characters. | This is a virtual gateway.

4. Click OK.

Creating a Virtual Interface

1. In the navigation pane on the left, choose Direct Connect > Virtual Interfaces.
2. On the displayed Virtual Interfaces page, click Create Virtual Interface in the upper right corner to create the first virtual interface.
3. Follow the prompts to set the following parameters.

   Table 3 Virtual interface parameters
   Parameter | Description | Example Value
   --- | --- | ---
   Region | Specifies the region in which the services will be handled. If you already selected a region and a project on the management console, you do not need to select the region here. | eu-de
   Name | Specifies the virtual interface name. It can contain 1 to 64 characters. Only digits, letters, underscores (_), and hyphens (-) are allowed. | vif-123
   Connection | Specifies the connection to be associated. Select the connection that is connected to Biere or Magdeburg. The access locations of the two connections must be different. | dc-123
   Virtual Gateway | Select the virtual gateway to be associated. | vgw-123
   VLAN | Specifies the virtual interface VLAN ID. The system automatically allocates a VLAN ID. You do not need to set this parameter. | 30
   Bandwidth | Specifies the virtual interface bandwidth in the unit of Mbit/s. If the selected connection is a hosting connection, the virtual interface exclusively uses the connection bandwidth. That is, the connection bandwidth is the bandwidth of the virtual interface. | 100
   Remote Subnet | Specifies the remote subnet and mask. You can enter a maximum of 50 remote subnets. Each pair must be unique. Separate every two remote subnets with commas (,). The remote subnet of the virtual interface cannot be the same as the VPC CIDR block of the virtual gateway. | 192.168.51.0/24
   Description | Provides supplementary information about the virtual interface. It can contain 0 to 128 characters. | This is a virtual interface.

4. Click Create Now.
5. Repeat step 1 to step 4 to create the second virtual interface.

Parent topic: Best Practice