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GR Time: The time taken for the GR Restarter and the GR Helper to establish a session between 

them. Upon detection of the down state of a neighbor, the GR Helper will preserve the topology or 

routing information sent from the GR Restarter for a period as specified by the GR Time. 

Configure a device as GR Restarter in a network. This device and its GR Helper must support GR or be 

GR capable. Thus, when GR Restarter restarts, its GR Helper can know its restart process. 

 

In some cases, GR Restarter and GR Helper can replace each other. 

 

The communication procedure between the GR Restarter and the GR Helper works as follows: 

1)  Establishing a GR session. 

Figure 1-1 A GR session is established between the GR Restarter and the GR Helper 

 

 

As illustrated in 

, Router A works as GR Restarter, Router B, Router C and Router D are the 

GR Helpers of Router A. A GR session is established between the GR Restarter and the GR Helper. 

2)  Restarting GR Restarter