TAILIEUCHUNG - Configuring Advanced Routing Protocols

The Open Shortest Path First (OSPF) protocol is a link state protocol that handles routing for IP traffic. Its newest implementation, version 2, which is explained in RFC 2328, is an open standard, like RIP. Chapter 9 offered a brief introduction to link state protocols. As you will see in this section, OSPF draws heavily on the concepts described in that chapter, but it also has some features of its own. Besides covering the characteristics of OSPF, you’ll be presented with enough information to undertake a very basic routing configuration using OSPF | CCNA CISCO CERTIFIED NETWORK ASSOCIATE Il Configuring Advanced Routing Protocols CERTIFICATION OBJECTIVES OSPF EIGRP Two-Minute Drill Q A Self Test 2 Chapter 11 Configuring Advanced Routing Protocols In Chapter 10 you were introduced to the configuration of two distance vector routing protocols IP RIP and IGRP. This chapter focuses on two advanced routing protocols OSPF and EIGRP. OSPF is a link state protocol and EIGRP is a hybrid protocol. This chapter covers only basic operation and configuration of these protocols. A more thorough discussion is covered in Cisco s BSCI CCNP and CCDP exam. OSPF The Open Shortest Path First OSPF protocol is a link state protocol that handles routing for IP traffic. Its newest implementation version 2 which is explained in RFC 2328 is an open standard like RIP. Chapter 9 offered a brief introduction to link state protocols. As you will see in this section OSPF draws heavily on the concepts described in that chapter but it also has some features of its own. Besides covering the characteristics of OSPF you ll be presented with enough information to undertake a very basic routing configuration using OSPF. Characteristics of OSPF OSPF was created in the mid-1980s in order to overcome many of the deficiencies and scalability problems that RIP had in large enterprise networks. Because it is based on an open standard OSPF is very popular in many corporate networks today and has many advantages including these It will run on most routers since it is based on an open standard. It uses the SPF algorithm developed by Dijkstra to provide a loop-free topology. It provides fast convergence with triggered incremental updates via Link State Advertisements LSAs . It is a classless protocol and allows for a hierarchical design with VLSM and route summarization. Given its advantages OSPF does have its share of disadvantages It requires more memory to hold the adjacency list of OSPF neighbors topology a link state database containing all .

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