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The router moves the packet that arrives at the input port to a correct (or) appropriate output port using the forwarding table.

• The input ports are one of the components of a router.

• The forwarding is done using the switching fabric.

• The routing processor maintains the forwarding table at each router as well as a shadow copy of the forwarding table at each input port.

Packet Loss at input ports:

• Packet loss may occur at the input ports when the size of the queue becomes large.

• The slow speed of switching fabric will result in the increase in size of the queue.

• When the size of the queue is increased, the buffering space of the router will be completely used.

Elimination of packet loss:

• The slow speed of switching fabric will result in the increase in size of the queue, which indeed results in packet loss.

• Increase the switching fabric speed at least by n times faster than the input line speed in order to eliminate the packet loss.

• The variable n denotes the number of input ports.


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