R3303-HP HSR6800 Routers Layer 3 - IP Routing Configuration Guide

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Configuring the non-IETF standard OSPF GR helper
Ste
p
Command Remarks
20. Enter system view.
system-view N/A
21. Enable OSPF and enter its
view.
ospf [ process-id | router-id
router-id | vpn-instance
vpn-instance-name ] *
N/A
22. Enable the link-local signaling
capability.
enable link-local-signaling Disabled by default.
23. Enable the out-of-band
re-synchronization capability.
enable
out-of-band-resynchronization
Disabled by default.
24. Configure the neighbors for
which the router can serve as
a GR helper.
graceful-restart help { acl-number
| prefix prefix-list }
Optional.
The router can serve as a GR
helper for any OSPF neighbor by
default.
Triggering OSPF GR
An active/standby MPU switchover in standalone mode, a global active/standby MPU switchover in IRF
mode, or the following command triggers OSPF GR.
To trigger OSPF GR, perform the following command in user view:
Task Command
Trigger OSPF GR. reset ospf [ process-id ] process graceful-restart
Configuring OSPF NSR
In standalone mode, with OSPF NSR, the standby MPU backs up link state information from the active
MPU. Upon an active/standby MPU switchover, the link state information can recover automatically and
the routes can be regenerated without tearing down the adjacencies or impacting other services.
In IRF mode, with OSPF NSR, the global standby MPU backs up link state information from the global
active MPU. Upon a global active/standby MPU switchover, the link state information can recover
automatically and the routes can be regenerated without tearing down the adjacencies or impacting
other services.
GR requires the cooperation of neighboring devices to recover routing information during the
active/standby MPU switchover period in standalone mode or global active/standby MPU switchover
period in IRF mode. NSR does not require that, and is more popular in practice.
IMPORTANT:
Do not configure OSPF NSR on a device acting as GR restarter.
To enable OSPF NSR: