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Configuring OSPF
OSPF Configuration Task List
IPC-224
Cisco IOS IP Configuration Guide
• Virtual links—Virtual links are supported.
• Not so stubby area (NSSA)—RFC 1587.
• OSPF over demand circuit—RFC 1793.
OSPF Configuration Task List
OSPF typically requires coordination among many internal routers: Area Border Routers (ABRs), which
are routers connected to multiple areas, and Autonomous System Boundary Routers (ASBRs). At a
minimum, OSPF-based routers or access servers can be configured with all default parameter values, no
authentication, and interfaces assigned to areas. If you intend to customize your environment, you must
ensure coordinated configurations of all routers.
To configure OSPF, perform the tasks described in the following sections. The tasks in the first section
are required; the tasks in the remaining sections are optional, but might be required for your application.
• Enabling OSPF (Required)
• Configuring OSPF Interface Parameters (Optional)
• Configuring OSPF over Different Physical Networks (Optional)
• Configuring OSPF Area Parameters (Optional)
• Configuring OSPF NSSA (Optional)
• Configuring Route Summarization Between OSPF Areas (Optional)
• Configuring Route Summarization When Redistributing Routes into OSPF (Optional)
• Creating Virtual Links (Optional)
• Generating a Default Route (Optional)
• Configuring Lookup of DNS Names (Optional)
• Forcing the Router ID Choice with a Loopback Interface (Optional)
• Controlling Default Metrics (Optional)
• Changing the OSPF Administrative Distances (Optional)
• Configuring OSPF on Simplex Ethernet Interfaces (Optional)
• Configuring Route Calculation Timers (Optional)
• Configuring OSPF over On-Demand Circuits (Optional)
• Logging Neighbors Going Up or Down (Optional)
• Changing the LSA Group Pacing (Optional)
• Blocking OSPF LSA Flooding (Optional)
• Reducing LSA Flooding (Optional)
• Ignoring MOSPF LSA Packets (Optional)
• Displaying OSPF Update Packet Pacing (Optional)
• Monitoring and Maintaining OSPF (Optional)
In addition, you can specify route redistribution; see the task “Redistribute Routing Information” in the
chapter “Configuring IP Routing Protocol-Independent Features” for information on how to configure
route redistribution.