RES05-01 Ensuring High Availability of Network Connections

Reliable external network connections prevent service interruptions when applications support external systems.

• Risk level

  High

• Key strategies
  • Network link redundancy: Multiple network paths must be supported to ensure high availability. If one connection fails, traffic will automatically switch to another available path.
  • Fast network link switchover: The system quickly switches services to a working network path upon a link failure by regularly checking for network connection issues.

  Public cloud networks rely on multiple EIPs and DNS for reliable connections. For high availability needs, smart DNS monitors EIP issues and switches services automatically upon a failure. Redundant DNS systems are also required to prevent service disruptions from DNS failures or errors.

  Link redundancy and switchover solutions in hybrid cloud networking scenarios:

  • Redundancy with two Direct Connect connections: Your on-premises data center connects to a Huawei Cloud VPC over two connections that are terminated at two Direct Connect locations in the same region. BGP routes are used to route traffic between your on-premises data center and the VPC you want to access. You can set the virtual interface priorities to determine the active and standby links for services.

    For details, see Connecting an On-Premises Data Center to a VPC over Two Connections in Load Balancing Mode (Virtual Gateway).

  • Dual-VPN redundancy: Your on-premises data center connects to a Huawei Cloud VPC over two VPN connections to ensure reliability. If one VPN connection is faulty, the system can switch to the other VPN connection to ensure network continuity. The two VPN connections can be deployed in active-active or active/standby mode.

    For details, see Connecting an On-premises Data Center to a VPC on the Cloud Through VPN (Active-Active Mode) and Connecting an On-premises Data Center to a VPC on the Cloud Through VPN (Active/Standby Mode).

  • Direct Connect/VPN connections in active/standby mode: Your on-premises data center connects to a Huawei Cloud VPC over both Direct Connect and VPN connections working in active/standby mode. You can attach the connections to an enterprise router for automatic switchover between active and standby links. If the active connection is faulty, services are automatically switched to the standby one. This reduces the impact of network interruptions on services and O&M costs.

    For details, see Allowing Direct Connect and VPN to Work in Active and Standby Mode to Link Data Center to Cloud.

• Related cloud services and tools
  • Direct Connect
  • Virtual Private Network (VPN)