Netgear NETGEAR Manual Do Utilizador

11-28

Quality of Service (QoS) Commands

The remaining parameters are all optional. The fourth data parameter is the sampling rate, 
indicating the period at which the queue is sampled for computing the average depth. Expressed in 
microseconds, the sampling rate is an integer from 0 to 1000000, with a default of 0 (meaning per-
packet sampling). The last parameter is the decay exponent, which determines how quickly the 
average queue length calculation decays over time, with a higher number producing a faster rate of 
decay. This value is an integer from 0 to 16, with a default of 9.

The last two parameters, namely sampling rate and decay exponent, are hierarchically 

specified in this command. That is, in order to provide a value for the decay exponent <0-16>, the 
user is required to also specify a sampling rate <

 for proper command interpretation. 

Out

This command is used to establish average rate traffic shaping for the specified class, which limits 
transmissions for the class to the committed information rate, with excess traffic delayed via 
queueing. The committed information rate is specified in kilobits-per-second (Kbps) and is an 
integer from 1 to 4294967295. 

Queue depth management defaults to tail drop, but the randomdrop command can be used 

to change to a RED scheme. 

This shaping rate must not exceed the maximum link data rate of 
the interface to which the policy is applied.

Out

This command is used to establish peak rate traffic shaping for the specified class, which allows 
transmissions for the class to exceed the committed information rate by sending excess traffic with 
the understanding that it could be dropped by a downstream network element. Two rate parameters 
are used, a committed information rate and a peak information rate. Each of these rates is specified 
in kilobits-per-second (Kbps) and is an integer from 1 to 4294967295. The peak rate must be 
specified as equal to or greater than the committed rate.