Summary
Summary
Defining and deciding what constitutes a Policy Routing structure is harder than implementing one. Most importantly you should understand that routing policy is NOT Policy Routing. Policy Routing refers to the network-centric structure that performs the routing. Routing policy is an administrative or otherwise externally imposed requirement on the network. While they are very closely intertwined, they need to be understood separately. That is why in this chapter I spoke of using Policy Routing structures to implement security, network, and routing policies.
When considering the implementation of a Policy Routing structure you must understand your entire network and the scope of the network operations. Understanding both the uses of your network and the operations of the protocols traversing your network is critical to designing a good Policy Routing structure. In short, if you do not know how a simple TCP transaction differs from a UDP transaction at the packet level, you will burn yourself on the flame of Policy Routing. Like any good tool it requires skill, knowledge, and a good idea of what you want before you will get usable results.
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