Re-enabling OSPFv3 graceful restart helper

If the OSPFv3 graceful restart (GR) helper has been disabled on a routing device, it can be re-enabled. GR helper mode can also be enabled with strict link-state advertisement (LSA) checking.

Before you begin

Procedure

Enter the configure terminal command to access global configuration mode.
```
device# configure terminal
```
Enter the ipv6 router ospf command to enter OSPFv3 router configuration mode and enable OSPFv3 globally.
```
device(config)# ipv6 router ospf
```
Enter the graceful-restart helper command and specify the strict-lsa-checking parameter to re-enable the GR helper with strict LSA checking.
```
device(config-ipv6-router-ospf-vrf-default-vrf)# graceful-restart helper strict-lsa-checking
```

Example

The following example re-enables the GR helper with strict LSA checking.

device# configure terminal
device(config)# ipv6 router ospf 
device(config-ipv6-router-ospf-vrf-default-vrf)# graceful-restart helper strict-lsa-checking