ECE495 Chapter Notes - Chapter 22: Routing Protocol, Open Shortest Path First, Routing Information Protocol

• School: University of Alberta
• Department: Electrical and Computer Engineering
• Course: ECE495
• Professor: mint

Document Summary

There are two basic methods of building a routing table: static routing, dynamic routing. A static routing table is created, maintained, and updated by a network administrator, manually. A static route to every network must be configured on every router for full connectivity. This provides a granular level of control over routing, but quickly becomes impractical on large networks. Routers will not share static routes with each other, thus reducing. However, static routing is not fault-tolerant, as any change to the routing infrastructure (such as a link going down, or a new network added) requires manual intervention. Routers operating in a purely static environment cannot seamlessly choose a better route if a link becomes unavailable. Static routes have an administrative distance (ad) of 1, and thus are always preferred over dynamic routes, unless the default ad is changed. A static route with an adjusted ad is called a floating static route, and is covered in greater detail in another guide.