see the phrase FIB policy rejected(no match) - normal forwarding. This indicates that the packet did not match any clauses in the route map, and was forwarded by normal means. See Chapter 11 for another example of route maps in action. Chapter 14: Route Maps CHAPTER 15 Switching Algorithms in Cisco Routers The term "switching," when used in the context of routers, describes the process of moving packets from one interface to another within a router. Packets in transit arrive at one interface, and must be moved to another, based on routing information stored in the router. Routing is the process of choosing paths and forwarding packets to destinations out- side of the physical router. Switching is the internal forwarding of packets between interfaces. Just as there are different routing protocols for determining the external paths for packets, there are different internal methods for switching. These switching algo- rithms, or paths, are a valuable way to increase (or decrease) a router's performance. One of the biggest impacts on how fast a packet gets from its source to its destina- tion is the processing delay present in each router along the way. Different switching methods have vastly different impacts on a router's performance. Choosing the right one-and knowing what to look for when there's a problem-will help the savvy administrator keep a network running at peak performance. A router must move packets from one interface to another, just like a switch. The decisions about how to move packets from one interface to another are based on the routing information base (RIB), which is built manually, or by layer-3 routing proto- cols. The RIB is essentially the routing table (see Chapter 9 for details). There are many types of switching within a Cisco router. They are divided into two categories: process switching and interrupt context switching. Process switching involves the processor calling a process that accesses the RIB, and waiting for the next sched- uled execution of that process to run. Interrupt contex