Selecting a Routing Protocol

Network designers and engineers frequently ask, "Which routing protocol should I use?" This section compares the two link-state protocols that are discussed in this chapter—IS-IS and OSPF. However, consider the following issues before selecting a routing protocol:

• Operational considerations—Determine how easy it is to manage a network over time. These considerations include how to determine a protocol's capability to adapt to changes, how to minimize disruptions to the network, and how to troubleshoot problems.

• Technical considerations—Assist in determining whether a given protocol is capable of supporting a particular set of network requirements.

• Business considerations—Defined as business priorities and policies that influence network design decisions. These types of considerations can originate from any area within a company and can be the keystones to the success of the network.

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