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Switch Delay

November 18, 2019

Switch latency refers to the time interval between the receipt of data packets from the switch and the start of replication of data packets to the destination port.

 

There are many factors that affect the delay size, such as forwarding technology and so on. Switches using through forwarding technology have a fixed delay. Because the direct switch decides the forwarding direction only according to the destination address, regardless of the overall size of the packet. Therefore, its delay is fixed, depending on the rate at which the switch interprets the destination address in the first six bytes of the packet.

Switch Delay

 

Because the switch using storage and forwarding technology must receive the complete data packet before it starts to forward the data packet, its delay is related to the size of the data packet. If the data packet is large, the delay will be large; if the data packet is small, the delay will be small. Gigabit switches using direct forwarding technology have a fixed delay, because direct switches decide the forwarding direction only according to the destination address, regardless of the overall size of the packet. Therefore, its delay is fixed.

 

Because the switch using storage and forwarding technology must receive the complete data package before starting to forward the data package, its data package is large, then the delay is large; the data packet is small, then the delay is small.