250 CHAPTER 25: GR OVERVIEW
Figure 67 The GR Restarter obtains topology and routing information from the GR Helper
As illustrated in Figure 67, the GR Restarter obtains the necessary topology and
routing information from all its neighbors through the GR sessions between them
and calculates its own routing table based on this information.
Graceful Restart
Mechanism for
Several Commonly
Used Protocols
The switch supports Graceful Restart based on Boarder Gateway Protocol (BGP),
Open Shortest Path First (OSPF), and Intermediate System to Intermediate System
(IS-IS).
For the implementation and configuration procedure of the Graceful Restart
mechanism of the above protocols, refer to “BGP Configuration” on page 365,
“OSPF Configuration” on page 273, and “IS-IS Configuration” on page 325.
GR helper
Router D
Router B
Router C
Router A
GR helper GR helper
GR restarter
Signals to establish GR session
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