Congestion Avoidance

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Congestion Avoidance

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When an interface on a router cannot transmit a packet immediately, the packet is queued, either in an interface Tx ring, or the interface output hold queue, depending on the switching path used. Packets are then taken out of the queue and eventually transmitted on the interface. If the arrival rate of packets to the output interface exceeds the router’s capability to buffer and forward traffic, the queues increase to their maximum length and the interface becomes congested. Tail drop is the router’s default queuing response to congestion. When the output queue is full and tail drop is in effect, all packets trying to enter (at the tail...

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