H3C S3610-28P Operation Manual page 468

Operation Manual – IPv4 Routing
H3C S3610&S5510 Series Ethernet Switches
The Graceful Restart interval on a router is used as the holdtime in the IS-IS Hello
PDUs so that its neighbors can maintain the adjacencies within the interval after the
router restarts.
By setting the SA (Suppress-Advertisement) bit in the hello PDUs sent by the GR
Restarter, its neighbors will not advertise adjacencies within the specified period until
the completion of LSDB synchronization between the GR Restarter and its neighbors.
This feature helps to effectively avoid blackhole routes due to the sending or receiving
of LSPs across the restart.
Note:
A device can act as both the GR Restarter and GR Helper at the same time.
Follow these steps to configure GR on the GR Restarter and GR Helper respectively:
To do...
Enter system view
Enable IS-IS, and
enter IS-IS view
Enable the GR
capability for IS-IS
Set the Graceful
Restart interval
Configure to set
the SA bit during
restart
4.7 Displaying and Maintaining IS-IS
Display brief IS-IS
information
Display information
about IS-IS enabled
interfaces
Display IS-IS license
information
Use the command...
system-view
isis [ process-id ]
[ vpn-instance
vpn-instance-name ]
graceful-restart
graceful-restart interval
timer
graceful-restart
suppress-sa
To do...
display isis brief [ process-id |
vpn-instance
vpn-instance-name ]
display isis interface
[ verbose ] [ process-id |
vpn-instance
vpn-instance-name
display isis license
Use the command...
4-35
Chapter 4 IS-IS Configuration
Remarks
—
Required
Disabled by default
Required
Disabled by default
Required
300 seconds by default
Optional
By default, the SA bit is not
set.
Remarks
Available in any view
Available in any view
Available in any view