3com MSR 20-20 참조 매뉴얼

Use the graceful-restart help command to configure for which OSPF neighbors 
the current router can serve as a GR Helper. (The neighbors are specified by the 
ACL or the IP prefix list.)

By default, the router can serve as a GR Helper for any OSPF neighbor.

# Enable GR Help for OSPF process 1 and configure the router as a GR Helper for 
OSPF neighbors defined in the ACL 2001.

<Sysname> system-view

[Sysname] ospf 1

[Sysname-ospf-1] graceful-restart help 2001 

graceful-restart interval interval-value

OSPF view

interval-value: Specifies the Graceful Restart interval, in the range 40 to 1,800 
seconds.

Use the graceful-restart interval command to configure the Graceful Restart 
interval.

Use the undo graceful-restart interval command to restore the default 
Graceful Restart interval.

By default, the Graceful Restart interval is 120 seconds.

Note that the Graceful Restart interval of OSPF cannot be less than the maximum 
value of dead intervals on all OSPF interfaces; otherwise, the Graceful Restart of 
OSPF may fail.

# Configure the Graceful Restart interval for OSPF process 1 as 100 seconds.

<Sysname> system-view

[Sysname] ospf 1

[Sysname-ospf-1] graceful-restart interval 100 

host-advertise ip-address cost

undo host-advertise ip-address