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The rexternal moves the packet that arrives at the input connect to a correct (or) proper output connect utilizing the forwarding table.

You are watching: Discuss why each input port in a high-speed router stores a shadow copy of the forwarding table.

• The routing processor maintains the forwarding table at each router.

• It additionally maintains a shadow copy of the forwarding table at each input port.

• The shadow copy helps in taking forwarding decisions of the packets locally at each input port.

• Tbelow is no necessity to depfinish on central routing processor for forwarding decisions of the packets.

• As the forwarding decisions of the packets are decentralized, forwarding handling bottleneck that might be developed at a solitary suggest in a router deserve to be avoided.

Hence, a shadow copy of the forwarding table is kept at each input port in a high-speed router.

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