What functions do GR timers provide in the MPLS LDP view

After GR Restarter performs an active/standby switchover, the MPLS Forwarding State Holding Timer is started, which is the Neighbor-liveness timer in the MPLS LDP view. Before the Neighbor-liveness timer expires, all forwarding entries before the active/standby switchover are retained. After the Neighbor-liveness timer expires, the GR Helper deletes the forwarding entries that are not restored.

When detecting that the GR Restarter performs an active/standby switchover or the LDP protocol restarts, the GR Helper starts the GR Reconnect timer. Before the GR Reconnect timer expires, the GR Helper retains all forwarding entries related to the GR Restarter. After the GR Reconnect timer expires, the GR Helper deletes the forwarding entries that are not restored. If a session is re-established between the GR Restarter and Helper before the GR Reconnect timer expires, the GR Helper deletes the GR Reconnect timer and starts the GR Recovery timer. Before the GR Recovery timer expires, the GR Helper helps the GR Restarter restore forwarding entries. After the GR Recovery timer times out, the GR Helper deletes all the GR Restarter-related forwarding entries that are not restored.

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