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IP Routing on Cisco IOS, IOS XE, and IOS XR: How a Router Works

Summary

This chapter provided an overview of the fundamentals of IP routing and IP switching and the control planes of operation. In summary, it showed how a router makes a forwarding decision, which consists of three basic components:

  • The routing protocols, which are used to build the routing table (RIB)
  • The routing table, which is used to program the switching mechanisms (that is, CEF)
  • The switching mechanisms used to perform the actual packet forwarding
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