User's Manual

47-17
protocol while GR helper is layer 3 switch to help GR restarter. In the above example, S1 is GR restarter and
S2 is GR helper
The advantages of OSPF GR in the following:
 Increase network reliability
 Reduce the effect of routing shiver to network
 Reduce the effect to traffic and avoid that lose packets during switchover
47.2 OSPF GR Configuration
OSPF GR configuration task list:
1. Enable GR for OSPF
2. Configure grace-period for OSPF GR restarter (optional)
3. Configure policy for OSPF GR helper (optional)
1. Enable GR for OSPF
Command
Explanation
OSPF protocol configuration mode
capability restart graceful
no capability restart
Enable GR of specific OSPF.
2. Configure grace-period for OSPF GR restarter (optional)
Command
Explanation
Global configuration mode
ospf graceful-restart grace-period
<integer>
no ospf restart grace-period
Configure grace period for GR restarter (The
switch is used to the switchover or restart the
protocol). The no command restores its default
value.
3. Configure the policy for OSPF GR helper (optional)
Command
Explanation
Global configuration mode
ospf graceful-restart helper
max-grace-period <integer>
no ospf graceful-restart helper
One of GR helper policy. Configure maximum
grace period supported by helper.
The no
command deletes all configured helper policy.
ospf graceful-restart helper never
no ospf graceful-restart helper
One of GR helper policy. Configure the switch
can not become OSPF GR helper. The no
command deletes all configured helper policy.