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graceful-restart (Protocols OSPF)

Syntax

graceful-restart {disable;helper-disable (standard | restart-signaling | both);no-strict-lsa-checking;notify-duration seconds;restart-duration seconds;}

Hierarchy Level

[edit logical-systems logical-system-name protocols (ospf | ospf3)],[edit logical-systems logical-system-name routing-instances routing-instance-name protocols (ospf | ospf3)],[edit protocols (ospf | ospf3)],[edit routing-instances routing-instance-name protocols ospf]

Release Information

Statement introduced before Junos OS Release 7.4.

Support for the no-strict-lsa-checking statement introduced in Junos OS Release 8.5.

Statement introduced in Junos OS Release 9.0 for EX Series switches.

Support for the helper mode standard, restart-signaling, and both options introduced in Junos OS Release 11.4.

Statement introduced in Junos OS Release 12.1 for the QFX Series.

Description

Configure graceful restart for OSPF.

Graceful restart allows a routing device to restart with minimal effects to the network, and is enabled for all routing protocols at the [edit routing-options] hierarchy level.

Options

disable—Disable graceful restart for OSPF.

helper-disable (standard | restart-signaling| both)—Disable helper mode for graceful restart. When helper mode is disabled, a device cannot help a neighboring device that is attempting to restart. Beginning with Junos OS Release 11.4, you can configure restart signaling-based helper mode for OSPFv2 graceful restart configurations. The standard, restart-signaling, and both options are only supported for OSPFv2. Specify standard to disable helper mode for standard graceful restart (based on RFC 3623). Specify restart-signaling to disable helper mode for restart signaling-based graceful restart (based on RFC 4811, RFC 4812, and RFC 4813). Specify both to disable helper mode for both standard and restart signaling-based graceful restart. The last committed statement takes precedence over the previously configured statement.

Default: Helper mode is enabled by default. For OSPFv2, both standard and restart-signaling based helper modes are enabled by default.

no-strict-lsa-checking—Disable strict OSPF link-state advertisement (LSA) checking to prevent the termination of graceful restart by a helping router. LSA checking is enabled by default.

Note: The helper-disable statement and the no-strict-lsa-checking statement cannot be configured at the same time. If you attempt to configure both statements at the same time, the routing device displays a warning message when you enter the show protocols (ospf | ospf3) command.

notify-duration seconds—Estimated time needed to send out purged grace LSAs over all the interfaces.

Range: 1 through 3600 seconds

Default: 30 seconds

restart-duration seconds—Estimated time needed to reacquire a full OSPF neighbor from each area.

Range: 1 through 3600 seconds

Default: 180 seconds

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

 

Related Documentation

 

Published: 2014-05-08

Supported Platforms

 

Related Documentation

 

Published: 2014-05-08

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