© 2006 Cisco Systems, Inc. All rights reserved. BSCI v Module Summary OSPF is an open-standard link-state routing protocol, offering quick convergence and the ability to scale large networks. There are five OSPF packet types: hello, DBD, LSU, LSR, and LSAck. Configuration of OSPF is a two-step process: –Enter OSPF configuration with the router ospf command. –Use the network command to describe which interfaces will run OSPF in which area. OSPF defines three types of networks: point-to-point, broadcast, and NBMA. On NBMA networks, OSPF mode options include nonbroadcast, broadcast, point-to- multipoint, point-to-multipoint nonbroadcast, and point-to- point.

© 2006 Cisco Systems, Inc. All rights reserved. BSCI v Module Summary (Cont.) LSAs are the building blocks of the LSDB. There are 11 types of OSPF LSAs. Route summarization reduces OSPF LSA flooding and routing table size, which reduces memory and CPU utilization on routers. Stub area techniques improve OSPF performance by reducing the LSA flooding. OSPF supports two types of authentication: –Simple password (or plain text) authentication –MD5 authentication

© 2006 Cisco Systems, Inc. All rights reserved. BSCI v3.03-3