Command Reference OSPFv2 Commands
Indicates that changes in Type 1 to Type 5 and Type 7 LSAs will be
checked during the period that the device acts as a GR helper to
determine whether the network changes. If the network changes, the
device will stop acting as the GR helper.
Indicates that changes in Type 1 to Type 3 LSAs will be checked
during the period that the device acts as a GR helper to determine
whether the network changes. If the network changes, the device will
stop acting as the GR helper.
The GR helper is enabled by default.
The router enabled with the GR helper does not check the LSA change by default.
Routing process configuration mode
This command is used to configure the GR helper capability of a router. When a neighbor router
implements GR, it sends a Grace-LSA to notify all neighbor routers. If the GR helper function is
enabled on the local router, the local router becomes the GR helper on receiving the Grace-LSA, and
helps the neighbor to complete GR. The disable option indicates that GR helper is not provided for
any device that implements GR.
After a device becomes the GR helper, the network changes are not detected by default. If any
change takes place on the network, the network topology converges after GR is completed. If you
wish that network changes can be quickly detected during the GR process, you can configure
strict-lsa-checking to check Type 1 to 5 and Type 7 LSAs that indicate the network information or
internal-lsa-checking to check Type 1 to 3 LSAs that indicate internal routes of the AS domain.
When the network scale is large, it is recommended that you disable the LSA checking options
(strict-lsa-checking and internal-lsa-checking) because regional network changes may trigger
termination of GR and consequently reduce the convergence of the entire network.
The following example disables the GF helper and modifies the policy of checking network changes.
Ruijie(config)# router ospf1
Ruijie(config-router)# graceful-restart helper disable
Ruijie(config-router)# no graceful-restart helper disable
Ruijie(config-router)# graceful-restart helper
strict-lsa-checking
Enables GR on the device.
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