OSPF Configuration Guidelines

To configure Open Shortest Path First version 2 (OSPF), you include the following statements:

protocols {

    ospf { 

        disable; 

        export [ policy-names ];

        external-preference preference;

        graceful-restart {

            disable;

            helper-disable;

            notify-duration seconds;

            restart-duration seconds;

        }

        import [ policy-names ];

        overload { 

            <timeout seconds>;

        } 

        preference preference;

        prefix-export-limit;

        rib-group group-name; 

        reference-bandwidth reference-bandwidth; 

        spf-delay;

        traffic-engineering {

            no-topology;

            shortcuts {

                lsp-metric-into-summary;

            }

        }

        traceoptions {

            file name <replace> <size size> <files number> <no-stamp> 

                <(world-readable | no-world-readable)>;

            flag flag <flag-modifier> <disable>; 

        }

        area area-id {

            area-range network/mask-length <restrict>;

            authentication-type authentication; 

            interface interface-name {

                disable;

                authentication {

                    md5 key-id;

                    simple-password key-id;

                }

                bfd-liveness-detection {

                    minimum-interval milliseconds;

                    minimum-receive-interval milliseconds;

                    minimum-transmit-interval milliseconds;

                    multiplier number;

                }

                dead-interval seconds;

                hello-interval seconds;

                interface-type type;

                metric metric;

                neighbor address <eligible>;

                passive;

                p2p;

                poll-interval seconds;

                priority number;

                retransmit-interval seconds;

                te-metric metric;

                transit-delay seconds;

            }

            label-switched-path name metric metric;

            nssa {

                area-range network/mask-length <restrict>;

                default-lsa {

                    default-metric metric;

                    metric-type type;

                    type-7;

                }

                (no-summaries | summaries);

            }

            peer-interface interface-name {

                disable;

                dead-interval seconds;

                hello-interval seconds;

                retransmit-interval seconds;

                transit-delay seconds;

            }

            sham-link {

                local-endpoint address;

                remote-endpoint address {

                    metric metric;

                }

            }

            stub <default-metric metric> <summaries | no-summaries>;

            virtual-link neighbor-id router-id transit-area area-id {

                disable;

                authentication {

                    md5 key-id;

                    simple-password key-id;

                }

                dead-interval seconds;

                hello-interval seconds;

                retransmit-interval seconds;

                transit-delay seconds;

            }

        }

    }

}

For a list of hierarchy levels at which you can configure these statements, see the statement summary sections for these statements.

To configure OSPF version 3 (OSPFv3), you include the following statements:

protocols {

    ospf3 { 

        disable; 

        export [ policy-names ];

        external-preference preference;

        graceful-restart {

            disable;

            helper-disable;

            notify-duration seconds;

            restart-duration seconds;

        }

        import [ policy-names ];

        overload { 

            <timeout seconds>;

        } 

        preference preference;

        prefix-export-limit;

        reference-bandwidth reference-bandwidth; 

        rib-group group-name; 

        spf-delay;

        traceoptions {

            file name <replace> <size size> <files number> <no-stamp> 

                <(world-readable | no-world-readable)>;

            flag flag <flag-modifier> <disable>; 

        }

        area area-id {

            area-range network/mask-length <restrict>;

            interface interface-name {

                disable;

                dead-interval seconds;

                hello-interval seconds;

                metric metric;

                passive;

                priority number;

                retransmit-interval seconds;

                transit-delay seconds;

            }

            nssa {

                area-range network/mask-length <restrict>;

                default-lsa {

                    default-metric metric;

                    metric-type type;

                    type-7;

                }

                (no-summaries | summaries);

            }

            stub <default-metric metric> <summaries | no-summaries>;

            virtual-link neighbor-id router-id transit-area area-id {

                disable;

                dead-interval seconds;

                hello-interval seconds;

                retransmit-interval seconds;

                transit-delay seconds;

            }

        }

    }

}

For a list of hierarchy levels at which you can configure these statements, see the statement summary sections for these statements.

By default, OSPFv2 and OSPFv3 are disabled.

NOTE: In this manual, the term OSPF refers to both OSPFv2 and OSPFv3.

This chapter describes the following tasks for configuring OSPF:

• Minimum OSPF Configuration
• Configuring the Backbone Area and Other Areas
• Configuring OSPF on Router Interfaces
• Configuring Authentication
• Configuring a Prefix Export Limit
• Configuring the Priority for Becoming the Designated Router
• Configuring Route Summarization
• Modifying the Interface Metric
• Configuring Route Preferences
• Configuring OSPF Timers
• Configuring the BFD Protocol
• Configuring Graceful Restart
• Configuring the SPF Delay
• Advertising Interface Addresses Without Running OSPF
• Advertising Label-Switched Paths into OSPF
• Configuring the Router to Appear Overloaded
• Enabling OSPF Traffic Engineering Support
• Modifying the Traffic Engineering Metric
• Configuring OSPF Routing Policy
• Configuring OSPF Routing Table Groups
• Configuring a Sham Link
• Configuring a Peer Interface
• Configuring Point-to-Point Adjacency over LAN Interfaces
• Tracing OSPF Protocol Traffic