3Com Switch 4800G 24-Port - Graceful Restart Communication Procedure

248 CHAPTER 25: GR OVERVIEW
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.
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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 64 A GR session is established between the GR Restarter and the GR Helper
As illustrated in Figure 64, 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 GR Restarter restarting
GR helper
Router D
Router B
Router C
Router A
GR helper GR helper
GR restarter
GR capable GR session