R3102-R3103-HP 6600/HSR6600 Routers Layer 3 - IP Routing Configuration Guide

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• 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
complete 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.
IMPORTANT:
You cannot configure OSPFv3 GR after configuring OSPFv3 virtual links, because they are not supported
at the same time.
Configuring GR Restarter
The following matrix shows the feature and router compatibility:
Feature 6602 HSR6602 6604/6608/6616
Configuring GR
Restarter
No Yes Yes
You can configure the GR Restarter capability on a GR Restarter.
To configure GR Restarter:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter OSPFv3 view.
ospfv3 [ process-id ] N/A
3. Enable the GR
capability.
graceful-restart enable Disabled by default.
4. Configure the GR
interval.
graceful-restart interval
interval-value
Optional.
120 seconds by default.
Configuring GR Helper
You can configure the GR Helper capability on a GR Helper.
To configure GR Helper:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter OSPFv3 view.
ospfv3 [ process-id ] N/A