3Com Switch 8800 Advanced Software V5 Configuration Guide

Introduction to Graceful Restart 795

Figure 242 Restarting process for the GR Restarter

As illustrated in Figure 242. The GR Helper detects that the GR Restarter has

restarted its routing protocol and assumes that it will recover within the GR Time.

Before the GR Time expires, the GR Helper will neither terminate the session with

the GR Restarter nor delete the topology or routing information of the latter.

3 GR Restarter signaling to GR Helper

Figure 243 The GR Restarter signals to the GR Helper(s) after restart

As illustrated in Figure 243, after the GR Restarter has recovered, it will signal to all

its neighbors and will reestablish GR Session.

4 The GR Restarter obtaining topology and routing information from the GR Helper

GR helper

Router D

Router B

Router C

Router A

GR helper GR helper

GR restarter

GR capable GR session

The administrator restarts GR Restarter

or GR Restarter is operating abnormally