When the system detects a failure in an Express Connect circuit, the system performs a failover within a few seconds. To accelerate failovers, you can add virtual border routers (VBRs) to a failover group. After the system detects failures on a VBR by using Bidirectional Forwarding Detection (BDF), the system can seamlessly switch workloads to the standby VBR in the failover group within less than one second.
- Before you use this feature, Submit a ticket to acquire the required permissions.
- You can add only VBRs that have BFD enabled to failover groups.
- Each failover group can contain only two VBRs and each VBR can be added to only one failover group.
- The VBRs in a failover group must be deployed in the same region and attached to the same Cloud Enterprise Network (CEN) instance.
- The BGP peer groups of the VBRs in a failover group must use the same Autonomous System (AS) number.
- You need to configure the VBRs in a failover group as active and standby VBRs and configure load balancing for the VBRs.
- Two VBRs are created in the same region and each VBR is connected to your data center through an Express Connect circuit. For more information, see Create and manage a VBR and Add and manage routes.
- The VBRs are attached to the same CEN instance. For more information, see Attach a network instance.
- BFD is configured for the VBRs. For more information, see Configure and manage BGP.
Create a failover group
- Log on to the Express Connect console.
- In the top navigation bar, select a region and then click Virtual Border Routers (VBRs) in the left-side navigation pane.
- On the Virtual Border Routers (VBRs) page, click the ID of the VBR that you want to manage.
- On the VBR details page, click the Failover Groups tab, and click Configure Backup Next Hop.
- In the Configure Backup Next Hop dialog box, set the following parameters and click OK:
Parameter Description CEN The system automatically displays the CEN instance to which the VBR is attached.
If the VBR is not attached to a CEN instance, click Attach Now to attach the VBR to a CEN instance.
Region The system automatically displays the region where the VBR is deployed. Failover Group Name Enter a name for the failover group.
The value must be 2 to 128 characters in length, and can contain letters, digits, underscores (_), and hyphens (-). It must start with a letter but cannot start with
Description Enter a description for the failover group. Standby VBR Select a standby VBR from the drop-down list.
The system automatically lists all VBRs that are deployed in the same region, attached to the same CEN instance, and have BFD enabled.
After you complete the preceding steps, the status of the failover group changes to Normal.Note You cannot modify the configuration of a failover group after the failover group is created. If the configuration of a failover group does not meet your business requirements, click Delete in the Actions column to delete the failover group. Then, create another failover group that meets your business requirements.
Test the failover group
After you complete the preceding steps, you can perform the following operations to test the failover group:
- Log on to an Elastic Compute Service (ECS) instance. For more information, see Connection methods.
- Run the
pingcommand on the ECS instance to check the connectivity between the ECS instance and your data center.If you can receive echo reply packets, it indicates that the connection is established.
- Disconnect the active VBR from the data center.
- Run the
pingcommand again on the ECS instance to check the connectivity between the ECS instance and your data center.If you can receive echo reply packets, it indicates that the connection is switched to the standby VBR in the failover group.