Link Speed— Link speed always refers to the speed of the physical link. In the case of a WAN link, it is the speed of the WAN segment that terminates in the building with the CloudBridge appliance. The speed of the other end of the link is not considered. For example, the following figure shows a network of four appliances. Each appliance has its incoming and outgoing bandwidths set to 95% of the speed of its own, local WAN segment, without regard to the speed of the remote endpoints.
The reason for setting the bandwidth limits to 95% of the link speed instead of 100% is to allow for link overhead (few links can carry data at 100% of their published speeds) and to ensure that the appliance is slightly slower than the link, so that it becomes a slight bottleneck. Traffic shaping is not effective unless the traffic shaper is the bottleneck in the connection.
Distinguishing Different Types of Traffic—In each link definition, you must declare whether the definition applies to a WAN link or a LAN network.