FIFO QUEUEING

Posted by AJ × 05:01

* Transmission Discipline: First-In, First-Out

* All packets are transmitted in order of their arrival.

* Buffering Discipline:- Discard arriving packets if buffer is full

* Cannot provide differential QoS to different packet flows

* Difficult to determine performance delivered

* Finite buffer determines a maximum possible delay

* Buffer size determines loss probability, but depends on arrival & packet length statistics.

FIFO Queueing with Discard Priority

FIFO queue management can be modified to provide different characteristics of packetloss performance to different classes of traffic.

* The above Figure 7.42 (b) shows an example with two classes of traffic.

* When number of packets in a buffer reaches a certain threshold, arrivals of lower access priority (class 2) are not allowed into the system.

* Arrivals of higher access priority (class 1) are allowed as long as the buffer is not full.

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