Static Routing
Static routing is configured by the network administrator manually routing information. When the network topology or link state changes, network administrators need to manually modify the routing table related to the static routing information. Static routing information is private by default, and will not be passed to other routers. Of course, the network administrator can also set the router to become shared. Generally applicable to comparative static routing simple network environment, in such an environment, the network administrator Yiyu clear De understanding of the internet topology, easy to set up the routing Xin Xi Zheng Que. Here are two examples for using static routing.
In Figure 1, assume that other than Network 1 Network 1 Network Access must be through the router A and router B, network administrators can set a router A to point B, the static routing information the router. This has the advantage of reducing router A and router B WAN link between the amount of data transmission, because the network using static routing, the routers A and B have no need for the exchange of routing information.
In a supporting DDR (dial-on-demand routing) network, dial-up link only when needed dial, it is not as dynamic routing information table provides routing information to change the situation. In this case, the network is also suitable to use static routing.
Another advantage of using static routing is the network security is high. Dynamic routing between routers frequently because of the need to exchange their routing table, while the routing table analysis can reveal the network topology and network address and other information. Therefore, the network for security considerations can also use static routing.
Large and complex network environment is often not static routing. On the one hand, network administrators from having a full understanding of the entire network topology; the other hand, when the network topology and link state changes, the routers in a wide range of static routing information needed to adjust, the difficulty of this work and complexity is very high.
Dynamic routing
Dynamic routing is the router to automatically create their own routing table, and the actual situation according to actual changes in a timely manner to adjust.
Dynamic routing mechanisms rely heavily on the router are the two basic functions: the maintenance of the routing table; routers to exchange routing information between the appropriate time.
Exchange routing information between routers is based on routing protocols. Indicated by Figure 2, we can visually see the process of routing information exchange. The ultimate purpose of exchanging routing information is found through a data exchange routing table the "best" path. Each has its own routing algorithm to measure the "best" set of principles. Most algorithms use a quantitative parameter to measure the path of the advantages and disadvantages, generally speaking, the smaller the parameter value, the better path. This parameter can be calculated path of a feature can also be consolidated based on multiple characteristics calculated. Several commonly used features are: the path contains a router nodes (hop count), the network transmission cost (cost), the bandwidth (bandwidth), latency (delay), load (load), reliability (reliability) and the maximum transmission unit MTU (maximum transmission unit).
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