WAN Optimisation

Sangfor ensures that a WAN operates at peak efficiency by incorporating a device at each of its connection points.

These devices handle all data transmitted over the WAN and use two main strategies to make sure the data goes at the fastest possible speed:
  • Compression packs the data down so that there is less to send, meaning that transmission times are reduced. Once data is received at its destination, it is unpacked and restored to its original form.
  • Caching avoids data having to be sent repeatedly to the same destination and so prevents unnecessary transmission. When data is sent for the first time, details are recorded at the sending device. If the same data is sent again to the same destination, only a tag needs to be sent since the local copy of the data can be used. Updated copies of data are identified so that only changes are sent with the tag.
These two strategies alone typically cause data transmitted over networks to be reduced by 30-60%. This can lead to bandwidth utilisation falling by up to 80% and data transfers being up to 60 times faster. Best of all, this all happens automatically with no user involvement and minimal configuration. Once the appliances are connected, everything continues to work. The only change that users will notice is that things happen much quicker.

Improvements are most significant when there are high levels of latency, which is a measure of the time taken to send a data packet to its destination. This delay increases with distance since the time a transmission takes to reach its destination cannot be altered. However, effectively reducing the amount of data that is sent can significantly improve overall transmission times, especially over long distances. Additionally, ensuring only full packets are sent will also increase efficiency.