configure ospfv3 virtual-link restart-helper

configure ospfv3 virtual-link {routerid} router-identifier {area} area-identifier restart-helper [none | planned | unplanned | both]


This command configures graceful restart helper mode behavior of OSPFv3 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.

Syntax Description

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.

Usage Guidelines

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 :
RouterID : 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 : BDR RtId :
Restart Helper : Both
Restart Helper Strict LSA Checking: Enabled
BFD Protection : Off

RtrId: IpAddr: fe80::204:96ff:fe51:ea8e Pri: 1 Type: Auto
State: FULL DR: BDR: 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.

Platform Availability

This command is available on ExtremeSwitching X435, X440-G2, X450-G2, X460-G2, X465, X590, X620, X670-G2, X690, X695, X870, 5320, 5420, and 5520 series switches.