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Cisco Express Forwarding by Stacia McKee, Russ White - CCIE No. 2635, Nakia Stringfield - CCIE No. 13451

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Appendix A. Scalability

Many customers have questions regarding Cisco Express Forwarding (CEF) scalability and performance. Confusion is understandable without a basic understanding of CEF operation and how it works with the Address Resolution Protocol (ARP) and routing tables. This appendix discusses scalability issues related to memory constraints and convergence.

Memory Considerations

Before deploying a new setup or feature, the CEF administrator must understand memory constraints. The best option is to identify the number of features, routes, and multipaths that the router will use on a platform before deploying. For example, if you plan to go from receiving partial Border Gateway Protocol (BGP) routes to receiving full BGP routes from an ...

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