Redundancy and fault tolerance

Fault tolerance ensures continuous and uninterrupted transmission of traffic over the SD-WAN network and functioning of network services. Fault tolerance is enhanced by the use of redundancy and failover mechanisms at different levels of the network infrastructure, for example, you can create backup service interfaces.

A fault-tolerant network can remain operational in case of minor problems as well as major disasters involving central components such as routers, links, and data centers. When a component fails, a backup component of the same type takes its place. For example, you can create a backup link to which traffic is transferred if the main link becomes unavailable.

Fault tolerance makes it easier to balance the load across multiple links by optimizing the utilization of traffic bandwidth and avoiding congestion. This helps avoid any existing link becoming a bottleneck in the network topology.

Kaspersky SD-WAN maintains continuous operation in the event of the following types of faults:

• Failure of a central component, such as
  orchestrator

  Controls the solution infrastructure, functions as an NFV orchestrator (NFVO), and manages network services and distributed VNFMs. Can be managed via the web interface or REST API when using external northbound systems.

  , SD-WAN Gateway, or
  SD-WAN Controller

  Centrally manages the overlay network and network devices in accordance with the service chain topology via the OpenFlow protocol. Deployed as a virtual or physical network function.

• Failure or overload of communication channels between geographically redundant central components, when network components are located at geographically dispersed locations to make data storage more reliable
• Failure or congestion of communication channels between
  CPE devices

  Telecommunication equipment, including virtual machines, located at the client premises. Used to connect the client location to the SD-WAN network, establish tunnels and transfer traffic between client locations. Traffic can be sent to a data center to provide network functions such as routing protocols, intrusion prevention, or anti-virus protection.

  and SD-WAN gateways