Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 481
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• helper-reject neighbors-the router ID of each restart router that does not receive assistance from the configured router. • mode-the situation or situations that trigger a graceful restart. • role-the role or roles the configured router can perform. Note: By default, OSPF graceful restart is disabled. You enable OSPF graceful restart in CONFIGURATION ROUTER OSPF mode. Command Syntax Command Mode Usage graceful-restart grace-period seconds CONFIG-ROUTER- Enable OSPF graceful-restart globally and set the grace period. OSPF-id Seconds range: between 40 and 3000 This is the period of time that an OSPF router's neighbors will advertise it as fully adjacent, regardless of the synchronization state, during a graceful restart. OSPF terminates this process when the grace period ends. graceful-restart helper-reject router-id CONFIG-ROUTEROSPF-id Enter the Router ID of the OSPF helper router from which the router does not accept graceful restart assistance. This applies to the specified router only. IP Address: A.B.C.D graceful-restart mode [planned-only | unplanned-only] CONFIG-ROUTEROSPF-id Specify the operating mode in which graceful-restart functions. FTOS supports the following options: • Planned-only. The OSPF router supports graceful-restart for planned restarts only. A planned restart is when the user manually enters a fail-over command to force the primary RPM over to the secondary RPM. During a planned restart, OSPF sends out a Grace LSA before the system switches over to the secondary RPM. OSPF also is notified that a planned restart is happening. • Unplanned-only. The OSPF router supports graceful-restart for only unplanned restarts. During an unplanned restart, OSPF sends out a Grace LSA once the secondary RPM comes online. graceful-restart role [helper-only | restart-only] By default, OSPF supports both planned and unplanned restarts. Selecting one or the other mode restricts OSPF to the single selected mode. CONFIG-ROUTEROSPF-id Configure the graceful restart role or roles that this OSPF router performs. FTOS supports the following options: • Helper-only. The OSPF router supports graceful-restart only as a helper router. • Restart-only. The OSPF router supports graceful-restart only during unplanned restarts. By default, OSPF supports both restarting and helper roles. Selecting one or the other role restricts OSPF to the single selected role. When you configure a graceful restart, the show run ospf command (Figure 24-17) displays information similar to the following. Open Shortest Path First (OSPFv2 and OSPFv3) | 481
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