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FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

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Enable graceful restart<br />

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

restart. Refer to Graceful Restart on page 537 <strong>for</strong> feature details.<br />

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

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

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

<strong>the</strong> configured router.<br />

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

• role—<strong>the</strong> role or roles <strong>the</strong> configured router can per<strong>for</strong>m.<br />

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

Note: S-<strong>Series</strong> systems support Graceful Restart in Helper mode only.<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<br />

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

period.<br />

Seconds range: between 40 and 3000<br />

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

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

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

CONFIG-ROUTER-<br />

OSPF<br />

CONFIG-ROUTER-<br />

OSPF<br />

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

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

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

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

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

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

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

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

user manually enters a fail-over command to <strong>for</strong>ce <strong>the</strong><br />

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

planned restart, OSPF sends out a Grace LSA be<strong>for</strong>e <strong>the</strong><br />

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

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

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

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

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

secondary RPM comes online.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 549

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