Configuring Ospfv3 Gr; Configuring Gr Restarter; Configuring Gr Helper - HP HPE FlexNetwork 7500 series Configuration Manual

Configuring OSPFv3 GR

GR ensures forwarding continuity when a routing protocol restarts or an active/standby switchover
occurs.
Two routers are required to complete a GR process. The following are router roles in a GR process:
•
GR restarter—Graceful restarting router. It must be Graceful Restart capable.
•
GR helper—The neighbor of the GR restarter. It helps the GR restarter to complete the GR
process.
To prevent service interruption after a master/backup switchover, a GR restarter running OSPFv3
must perform the following tasks:
•
Keep the GR restarter forwarding entries stable during reboot.
•
Establish all adjacencies and obtain complete topology information after reboot.
After the active/standby switchover, the GR restarter sends a Grace LSA to tell its neighbors that it
performs a GR. Upon receiving the Grace LSA, the neighbors with the GR helper capability enter the
helper mode (and are called GR helpers). Then, the GR restarter retrieves its adjacencies and LSDB
with the help of the GR helpers.

Configuring GR restarter

You can configure the GR restarter capability on a GR restarter.
IMPORTANT:
You cannot enable OSPFv3 NSR on a device that acts as GR restarter.
To configure GR restarter:
Step
1. Enter system view.
2. Enter OSPFv3 view.
3. Enable the GR capability.
4. (Optional.) Set the GR
interval.

Configuring GR helper

You can configure the GR helper capability on a GR helper.
To configure GR helper:
Step
1. Enter system view.
2. Enter OSPFv3 view.
3. Enable the GR
helper capability.
Command
system-view
ospfv3 [ process-id |
vpn-instance
vpn-instance-name ] *
graceful-restart enable [ global
| planned-only ] *
graceful-restart interval interval
Command
system-view
ospfv3 [ process-id | vpn-instance
vpn-instance-name ] *
graceful-restart helper enable
[ planned-only ]
444
Remarks
N/A
N/A
By default, OSPFv3 GR restarter
capability is disabled.
By default, the GR interval is 120
seconds.
Remarks
N/A
N/A
By default, the GR helper capability is
enabled.