This command configures graceful restart helper mode behavior of OSPFv3 (Open Shortest Path First version 3) interfaces for its neighbors. When an interface is acting as a helper, it continues to advertise the restarting router as if it was fully adjacent.
| virtual-link | OSPFv3 virtual link. |
| routerid | OSPFv3 router ID. |
| router-identifier | Router ID of neighbor OSPFv3 router. |
| area | OSPFv3 area. |
| area-identifier | Transit area ID of virtual link. |
| restart-helper | Graceful restart helper mode. |
| none | Disable helper mode (default). |
| planned | Support planned restart only. |
| unplanned | Support unplanned restart only. |
| both | Support both planned and unplanned restart. |
Helper mode is disabled by default.
When the area option is used, the command applies to all interfaces in the area at that time. One OSPFv3 interface may not help more than one restarting router at a time. An OSPFv3 interface may not enter helper mode when the router is performing a graceful restart. All the interfaces to a neighbor router must be configured as graceful restart helpers, or the router does not support graceful restart for its neighbor.
Restart helper mode appears in the show ospfv3 interfaces detail output.
# show ospfv3 interfaces detail Interface : v100 Enabled : ENABLED Router : ENABLED AreaID : 0.0.0.0 RouterID : 10.1.1.2 Link Type : point-to-point Passive : No Cost : 40/A Priority : 1 Transit Delay : 1s Hello Interval : 10s Rtr Dead Time : 40s Retransmit Interval : 5s Wait Timer : 40s Interface ID : 19 Instance ID : 0 State : P2P Number of state chg : 1 Hello due in : 7s Number of events : 2 Total Num of Nbrs : 1 Nbrs in FULL State : 1 Hellos Rxed : 127733 Hellos Txed : 127739 DB Description Rxed : 4 DB Description Txed : 3 LSA Request Rxed : 1 LSA Request Txed : 1 LSA Update Rxed : 2121 LSA Update Txed : 6156 LSA Ack Rxed : 5962 LSA Ack Txed : 2121 In Discards : 0 DR RtId : 0.0.0.0 BDR RtId : 0.0.0.0 Restart Helper : Both Restart Helper Strict LSA Checking: Enabled BFD Protection : Off Neighbors: RtrId: 10.1.1.1 IpAddr: fe80::204:96ff:fe51:ea8e Pri: 1 Type: Auto State: FULL DR: 0.0.0.0 BDR: 0.0.0.0 Dead Time: 00:00:31 Options: 0x13 (-|R|-|-|E|V6) Opaque LSA: No Restart Helper Status: Off Last Restart Helper Exit Reason: None BFD Session State: None
This command was first available in ExtremeXOS 21.1.
This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X590, X620, X690, X870 series switches.
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