Introduction to Routing Protocols
Many IP routing protocols exist, in part due to the long history of IP; however, if you compare all the IP routing protocols, they all have some core features in common. Each routing protocol causes routers (and Layer 3 switches) to
1. Learn routing information about IP subnets from other neighboring routers
2. Advertise routing information about IP subnets to other neighboring routers
3. Choose the best route among multiple possible routes to reach one subnet, based on that routing protocol’s concept of a metric
4. React and converge to use a new choice of best route for each destination subnet when the network topology changes—for example, when a link fails
All the routing protocols discussed in this chapter ...
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