Configuring Is-Is Gr; Configuring Is-Is Nsr - HP 3600 v2 series Configuration Manual

Configuring IS-IS GR

NOTE:
The IS-IS GR and IS-IS NSR features are mutually exclusive.
Restarting IS-IS on a router causes network disconnections and route reconvergence.
With the Graceful Restart (GR) feature, the restarting router—known as the GR Restarter—can notify the
event to its GR capable neighbors. GR capable neighbors—known as the GR Helpers—will keep their
adjacencies with the router within a configurable GR interval. After the restart, the router contacts its
neighbors to retrieve its routing table.
During this process, the network keeps stable.
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
Suppress the SA bit during
restart

Configuring IS-IS NSR

NOTE:
The IS-IS NSR and IS-IS GR features are mutually exclusive.
According to the GR feature, after a master/slave switchover, the GR Restarter obtains routing
information from its neighbors and the IS-IS process on the new master needs to learn all routes. If the
network topology has changed during the switchover period, removed routes cannot be updated to the
device, which may cause black hole routes.
Use the command...
system-view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
graceful-restart
graceful-restart interval timer
graceful-restart suppress-sa
160
Remarks
—
Required
Disabled by default
Required
Disabled by default
Required
300 seconds by default
The Graceful Restart interval is set as the
holding time in the hello PDUs. Within the
interval, the neighbors will keep their
adjacency with the GR Restarter.
Optional
By default, the SA bit is not suppressed.
By enabling the GR Restarter to suppress the
Suppress-Advertisement (SA) bit in the hello
PDUs, the neighbors will still advertise their
adjacency with the GR Restarter.