ÙProbing Stage – Estimation of the impact of a new flow
ØEvery QoS metric can be considered as a value which increases as the
“traffic load” increases. The addition of a new connection will increase the load of the paths it
may be using, and therefore it is assumed that the value taken by the QoS metrics will
increase.
ØLet us consider some link (i,j). A small increase x in the load that is
obtained in a controlled manner, generates an estimate of the manner in which the QoS metric q
varies around the current load point Y.
ØThe impact of a new flow with total traffic rate X can then be evaluated by
using the measured derivative without having to know the initial load Y.