Chapter 3. CEF Enhanced Scalability

This chapter covers the following topics:

Cisco Express Forwarding (CEF) is the most widely used forwarding mechanism on IP networks, so why change what works? There are several reasons:

  • To improve CEF scaling and convergence times, with the end goal being the ability to handle up to 1 million prefixes in the forwarding table (so that you can sleep well if your network has reached the 900,000-route mark, and you were worried about the next phase of network growth)
  • To make the interfaces between CEF, the routing table, access lists, Multiprotocol ...

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