Stupid CCIE Tricks Series - Section 8: Redistribution, Policy Routing and Performance Routing
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Stupid CCIE Tricks Series - Section 8: Redistribution, Policy Routing and Performance Routing
Route redistribution with the “real†world is typically limited to a small number of protocols (like 2), with typical policies of default route injected in one direction and passing all routes in the other (pick a core, the other an edge protocol). Normally we use multiple protocols either due to mergers, acquisitions, scalability, legacy or politics. The typical scenarios are basic, to try and make it supportable and stable. This is not CCIE level behavior. CCIE redistribution could be some of the more complex, time consuming parts of the practical exam. The process to redistribute is fairly straight forward, it may be the number of routing protocols and methods required that make it complex. We will go through the process, the configuration and what I think are best practice to stabilize the network in the process. The only way to get good at redistribution is to practice, so there are exercises at the end of this document. Policy based routing (PBR) is, in some minds, a fancy static route. Normal routing is destination based, PBR can include source, protocol, ports, size and so on. Most PBR done in the industry is for niche issues…specific types of traffic needs to be treated in a specific way. Most cases, PBR is not heavily used. As in all other topics, we have to be concerned in the CCIE way of doing things, how might this apply to CCIE practical exam, so we will go through the process, configuration examples and then exercises. Cisco Optimized Edge Routing/Performance Routing is a relatively new feature within the Cisco arsenal of features and tends to be complex due to a) its newness and b) its seemingly constant change from version to version. Due to the amount of comments and changes by version, the OER/PfR section does hold a bit more than normal configuration guide reference. I try to throw my 2 cents in there two to try and help in the explanations. There are examples of configurations as well to help clarify. So, the goal of this document is to give the candidate a better understanding of how redistribution, policy routing and OER/PfR work and how they may be used within the CCIE R&S practical exam and therefore will help shorten the time spent configuring and troubleshooting these technologies within the exam.
