Transcription of Configuring Route Maps and Policy-Based Routing
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Configuring Route Maps and Policy-Based Routing
C H A P T E R2 Configuring Route Maps and Policy-Based RoutingPerhaps one of the most colorful descriptions for Route maps is that Route maps are like duct tape for the network not necessarily because they can be used to fix or mend something broken, but because they can be applied to numerous situations to address many issues. At times, they may not be the most pretty solutions, but they will be very effective. After you learn to configure and use Route maps, you will soon see why some engineers refer to them as Route tape. In Policy-Based Routing (PBR), for instance, you may use a Route map when traffic has to follow a particular path through the internetwork. This path may differ from the path the Routing protocol wants to forward traffic on.
148 Chapter 2: Configuring Route Maps and Policy-Based Routing In a nutshell, route maps work in the following manner: 1 Essentially, a process—whether it is a redistribution process, policy routing, or some other process such as Network Address Translation (NAT)—calls a route map by a text-based
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