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7.8.1.0 - Force10 Networks

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Enable graceful restart<br />

Graceful Restart is enabled for the global OSPF process. Use these commands to configure OSPF graceful<br />

restart. Refer to Graceful Restart on page 524 for feature details.<br />

The <strong>Force10</strong> <strong>Networks</strong> implementation of OSPF graceful restart enables you to specify:<br />

• grace period—the length of time the graceful restart process can last before OSPF terminates it.<br />

• helper-reject neighbors—the router ID of each restart router that does not receive assistance from<br />

the configured router.<br />

• mode—the situation or situations that trigger a graceful restart.<br />

• role—the role or roles the configured router can perform.<br />

Note: By default, OSPF graceful restart is disabled.<br />

You enable OSPF graceful restart in CONFIGURATION ROUTER OSPF mode.<br />

Command Syntax Command Mode Usage<br />

graceful-restart<br />

grace-period seconds<br />

graceful-restart<br />

helper-reject router-id<br />

graceful-restart mode<br />

[planned-only |<br />

unplanned-only]<br />

CONFIG-ROUTER-<br />

OSPF-id<br />

Enable OSPF graceful-restart globally and set the grace<br />

period.<br />

Seconds range: between 40 and 3000<br />

This is the period of time that an OSPF router’s neighbors will advertise it as fully<br />

adjacent, regardless of the synchronization state, during a graceful restart.<br />

OSPF terminates this process when the grace period ends.<br />

CONFIG-ROUTER-<br />

OSPF-id<br />

CONFIG-ROUTER-<br />

OSPF-id<br />

Enter the Router ID of the OSPF helper router from which the<br />

router does not accept graceful restart assistance.<br />

This applies to the specified router only.<br />

IP Address: A.B.C.D<br />

Specify the operating mode in which graceful-restart<br />

functions. FTOS supports the following options:<br />

• Planned-only. The OSPF router supports graceful-restart<br />

for planned restarts only. A planned restart is when the<br />

user manually enters a fail-over command to force the<br />

primary RPM over to the secondary RPM. During a<br />

planned restart, OSPF sends out a Grace LSA before the<br />

system switches over to the secondary RPM. OSPF also is<br />

notified that a planned restart is happening.<br />

• Unplanned-only. The OSPF router supports<br />

graceful-restart for only unplanned restarts. During an<br />

unplanned restart, OSPF sends out a Grace LSA once the<br />

secondary RPM comes online.<br />

By default, OSPF supports both planned and unplanned restarts. Selecting one or<br />

the other mode restricts OSPF to the single selected mode.<br />

540 Open Shortest Path First (OSPFv2 and OSPFv3)

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