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Authors:
James F. Kurose, Keith W. Ross
Chapter:
The Network Layer
Exercise:
Review
Question:7 | ISBN:9780132856201 | Edition: 6

Question

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

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Answer

With the shadow copy, the forwarding decision is made locally, at each input port, without invoking the centralized routing processor. Such decentralized forwarding avoids creating a forwarding processing bottleneck at a single point within the router.

 

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