Expectation setting
QoS is not magic
- QoS will not alter the speed of light
- On an unloaded network, QoS mechanisms will not make the network any faster
- Indeed, it could make it slightly worse!
- QoS does not create nonexistent bandwidth
- Elevating the amount of resources available to one class of traffic decreases the amount available for other classes of traffic
- QoS cannot offer cures for a poorly performing network