The purpose of the simulation

It's less accurate than others, but it also requires fewer calculations while being almost perfectly fair. SQF divides traffic flows, and assigns each stream to a queue. This allows giving each connection whether to send data very fairly and prevents queue management solutions a single conversation from drowning others. The traffic is divided into FIFO queue, sending a packet of each FIFO at every turn.

That is why it is called fair. RED (Random Early Detection) or direct early detection was defined by Sam Floyd and Van Jacobson, they developed to queue management online offer advantages over Drop Tail. RED detects congestion at a router before the latter occurs. The router monitors the size of the queue and depending on this, throws following a certain probability of packet arrival as a precaution so they penalized flows reduce their rate. Rather than wait for the queue is full, a packet that arrives with a certain probability of elimination (drop probability) when the queue reaches a certain level is eliminated.

To queue management solutions manage

After the fiftieth second, the number of dropped packets does not increase because there are more streams on the link. Note that the number of dropped packets of Source0 queue management solutions is more important than the other two sources, when the queue is queue management online filled to its maximum capacity, newly arriving packets are dropped until a site is released into the queue to accept incoming traffic.

The red curve represents the bandwidth used by the source 0, the green represents the bandwidth used by the source 1, and the blue curve represents the bandwidth used by the source2 is noted that the amount of bandwidth three sources at a given time does not exceed the capacity of the link eastern1 maps. The graph of lost packets based on time confirms the fairness of SFQ queue, which does not allow one source to stifle traffic but rather to give the same priority to packets from the queue management solutions three source nodes, the number of dropped packets is almost the same among the three sources.

Main causes of congestion

Note that in the graph that the packet loss is less important queue management online than Drop Tail as RED is an active management, preventive measure against congestion, RED monitors the occupancy rate of the queue and when it exceeds the threshold (level drop), packets will be discarded to reduce the flux end queue management solutions the queue does not saturate. The rating saw in the previous chapter, M/ M/ means a system arrivals Markov/ Poisson (M) at time Markov treatment/ Exponential (M), consisting of a FIFO queue of unlimited size and a single server.