H3C S9500E Series, Configuration Manual, Page: 201 / 459

201
To do… Use the command... Remarks
Step 6
Configure a DIS name
isis dis-name symbolic-name
Optional
Not configured by default
This command takes
effect only on a router
with dynamic system ID to
host name mapping
configured.
This command is not
supported on P2P
interfaces.
Configuring IS-IS GR
The IS-IS GR and IS-IS NSR features are mutually exclusive.
Before performing a master or backup switchover between IRF member switches, configure the irf mac-
address persistent always
command to prevent bridge MAC address changes that can cause IS-IS GR
failure after the switchover.
Restarting IS-IS on a router causes transient network disconnection and route reconvergence.
With the GR feature, the restarting router, known as the GR Restarter, can notify the event to its
GR capable neighbors, which, 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.
You can enable the GR Restarter to suppress the SA bit in the hello PDUs. By default, a GR
Restarter sets the SA bit in the hello PDUs. In this way, its neighbors, upon receiving the hello
PDUs, will not advertise the GR Restarter in LSPs. Thus, no router sends packets to the GR
Restarter, and black hole routing is avoided.
Follow these steps to configure GR on the GR Restarter and GR Helper, respectively:
To do… Use the command… Remarks
Step 1
Enter system view
system-view
—