H3C Technologies H3C S5560 Series Switches - Manual (Page 113)

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Step Command Remarks
4. (Optional.) Enable GR helper
capability. graceful-restart helper enable
[ planned-only ] By default, GR helper capability is
enabled.
5. (Optional.) Enable strict LSA
checking for the GR helper. graceful-restart helper
strict-lsa-checking By default, strict LSA checking for
the GR helper is disabled.
Configuring the non-IETF OSPF GR helper
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable OSPF and enter its
view.
ospf [ process-id | router-id
router-id | vpn-instance
vpn-instance-name ] *
N/A
3. Enable the link-local signaling
capability.
enable link-local-signaling
By default, the link-local signaling
capability is disabled.
4. Enable the out-of-band
re-synchronization capability. enable
out-of-band-resynchronization
By default, the out-of-band
re-synchronization capability is
disabled.
5. (Optional.) Enable GR helper. graceful-restart helper enable By default, GR helper is enabled.
6. (Optional.) Enable strict LSA
checking for the GR helper. graceful-restart helper
strict-lsa-checking
By default, strict LSA checking for
the GR helper is disabled.
Triggering OSPF GR
OSPF GR is triggered by an active/standby switchover or when the following command is executed.
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
Nonstop routing (NSR) backs up OSPF link state information from the active process to the standby
process. After an active/standby switchover, NSR can complete link state recovery and route
regeneration without tearing down adjacencies or impacting forwarding services.
NSR does not require the cooperation of neighboring devices to recover routing information, and is used
more often than GR.
IMPORTANT:
A device that has OSPF NSR enabled cannot act as GR restarter.
To enable OSPF NSR: