ospfpr张esentation.ppt

Nortel Corporate Presentation ? 2004 Nortel OSPF Routing Protocol History Reference Documents Objective Identify the purpose of OSPF areas Describe the concept of OSPF adjacencies. List the types of Open Shortest Packet First (OSPF) packets. Explain how neighbor adjacencies are established in OSPF. Identify the exchange process and the neighbor adjacency states of OSP. Define OSPF link state update sequence numbers. Describe adjacency behavior for each type of link. List the types of OSPF routers. Explain in general terms all of the LSAs defined by OSPF, and specifically describe the most common LSAs used in OSPF today. List the types of Open Shortest Path First (OSPF) areas. Define the two major purposes of Open Shortest Path First (OSPF) virtual links. Contents Routing Protocol Overview OSPF Protocol Operation Summary Excises QA Routing Protocols Overview  Types of Routing Protocols Types of Routing Protocols ——IGPEGP Types of Routing Protocols ——Classified by how to determine routes Distance Vector Link State Distance Vector Link State Working Layers Reliability Agenda Operation of OSPF Basic Concept of OSPF Explain Operation of OSPF Optimization of OSPF Basic Concept of OSPF -characteristics Fast Converge Loop-free VLSM Supported Hierarchical Management Authentication Supported Suitable for Large-scale Network Basics of OSPF Neighbors First step for communication Hello packet is used Verify that the Area ID, Authentication, Network Mask, HelloInterval, RouterDeadInterval, and Options values Adjacency To perform database synchronization, the neighbors must be adjacent Router ID Exclusive identifier a router Loopback interface ip or highest ip address Area For Optimization Hierarchical Five Types of OSPF Packets Three Types of Databases SPF Algorithm: Dijkstra Algorithm Advantages of Loopback Interfaces More stable than any physical interface. It is active when the router b