If many VLANs are configured on a VLAN tag termination sub-interface, DAD messages may fail to be transmitted within the default timeout period (1s). To resolve this issue, run the ipv6 nd dad timeout command to prolong the timeout period for DAD messages.
The system view is displayed.
The sub-interface view is displayed.
The IPv6 function is enabled.
A timeout period is set for DAD messages.
The configuration is committed.