H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 210)

22-2
Graceful Restart Communication Procedure
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 with each other.
The communication procedure between the GR Restarter and the GR Helper works as follows:
1) A GR session is established between the GR Restarter and the GR Helper.
Figure 22-1 A GR session is established between the GR Restarter and the GR Helper
As illustrated in Figure 22-1 , 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.