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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