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14.4 When to Use Static Routing
When to Use Static Routing Section 14: Enabling Static Routing Static routes are best suited for small networks, such as LANs, where routes rarely change. If routes change, you need to manually update your routes to reflect the new data transmission paths. Advantages of Using Static Routing Some of the advantages of using static routes are as follows: Conserving router resources: Static routing does not consume network bandwidth and the CPU resources of the router. When you use a routing protocol, the traffic between routers adds some overhead as the routers exchange routing updates about remote networks. Depending on the size of the network, a router requires some CPU cycles to compute the best way to remote networks. Simple to configure in a small network: Static routes are commonly used in small networks that have few routers. Many small networks are designed as stub networks; for these types of networks, static routes are the most appropriate solution. Also, most of these networks are designed in a hubandspoke topology, where you can use default routes for branches that are pointing to the hub, which is the gateway to other networks. Security: In some cases, you may want to define static routes to control the data transmission paths that are used by your data. This may be useful in highly secure environments. Disadvantages of Using Static Routing Some of the disadvantages of using static routes are as follows: Scalability: Static routing might be appropriate for networks that have fewer than four or five routers. Dynamic routing is more appropriate for large networks to reduce the probability of errors in routing configuration. Accuracy: If your network changes and you do not update the static routes, your router does not have accurate knowledge of your network. This can result in lost or delayed data transmissions. High maintenance: When the number of routers increases, the number of static routes also increases. In large networks, adding even one router with only one new network means that in addition to configuring the newly added router with static routes to other networks, you must configure all existing routers in the network with static routes to the new network. Up Next: Static Route Configuration