H3C Technologies H3C S12500-X Series Switches - Manual (Page 104)

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• GR restarter—Graceful restarting router. It must have GR capability.
• GR helper—A neighbor of the GR restarter. It helps the GR restarter to complete the GR process.
OSPF GR has the following types:
• IETF GR—Uses Opaque LSAs to implement GR.
• Non-IETF GR—Uses link local signaling (LLS) to advertise GR capability and uses out of band
synchronization to synchronize the LSDB.
A device can act as a GR restarter and GR helper at the same time.
227B
Configuring the OSPF GR restarter
You can configure the IETF or non IETF OSPF GR restarter.
497B
Configuring the IETF OSPF GR restarter
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 opaque LSA reception
and advertisement capability. opaque-capability enable
By default, opaque LSA reception
and advertisement capability is
enabled.
4. Enable the IETF GR.
graceful-restart ietf [ global |
planned-only ] * By default, the IETF GR capability is
disabled.
5. (Optional.) Configure GR
interval.
graceful-restart interval
interval-value
The default setting is 120 seconds.
498B
Configuring the non-IETF OSPF GR restarter
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. Enable non-IETF GR.
graceful-restart [ nonstandard ]
[ global | planned-only ] * By default, non-IETF GR capability
is disabled.
6. (Optional.) Configure GR
interval. graceful-restart interval
interval-value
The default setting is 120 seconds.