This chapter covered an important aspect of how OSPF communicates information within an OSPF routing domain. You learned about the nine types of OSPF LSAs and how an LSA begins the link-state database synchronization steps. You also learned about the formal processes and protocols that are used with OSPF—Hello, exchange, and flooding—each of which have different roles and responsibilities within OSPF. This chapter also covered manipulating LSAs as a new default behavior that Cisco implemented in OSPF. The chapter discussed LSA grouping and packet pacing, and it concluded with some troubleshooting and an exploration of some common problems.

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