Qos Model - UTStarcom iSpirit 3026 Manual

data flow of one class is over bandwidth limited value. Mark: processing on data flow of "In
Profile" and "Out of Profile", throw away the data flow of "Out of Profile". Scheduling: make PRI
processing for IP data packet in all PRI queues of switch output port based on scheduling policy,
and send out data packet. FFP （Fast Filtering Processor） : speedy filtration processor, hareware
of iSpirit 3026 switch make classification and QoS policy with FFP.

2. QoS Model

Please refer to Figure12-3 that shows QoS model. At input port realize classification, policing,
and mark, introduction as follows: classification: make classification for IP data packet received,
to generate inner DSCP value to make preparation for QoS policy. QoS policing: carry out QoS
processing for inner DSCP value generated from classification, including bandwidth limitation
mapping into a PRI queue to generate class information. Mark: throw away the data of "Out of
Profile", to determine that if the class information of data flow of "In Profile" should be modified or
not. At output port realize the Queuing and Scheduling, as follows: Queuing: according to the
results from QoS policy to put IP data packet into relative output PRI queue for temporary saving.
Scheduling: carry out PRI processing for IP data packet saved in queue according to adjusting
policy.
Figure 12-3 .QoS Model
3. Classification
Classification is used for dividing different data flow based on one or more field matching, and
mapped into one internal DSCP value. The classification can be carried out only after QoS
switch port is started and data packet received, the classification cannot be carried out if one
port is not started with QoS and forward in best-effort way.
For QoS trust port, classification is much simple according to class information, and mapped into
internal DSCP value. Please refer to Figure 12-4 that provides detail description for classification
flow.