How do S series switches implement unplanned OSPF GR and planned OSPF GR

In unplanned GR mode, a device directly performs a active/standby switchover without sending a grace LSA to its peer. As a result, the peer does not enter the Helper state. After the standby card switches to the active card and goes Up, the device sends a grace LSA. Therefore, the smooth time cannot exceed the dead interval.
The timer in graceful period timer of IETF GR needs to be negotiated based on the timer value configured on the Restarter. The default timer value is 120s.

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