The ipv6 nd ra-unicast send enable command enables a routing device to send unicast RA messages in response to RS messages it receives on an interface.
The undo ipv6 nd ra-unicast send enable command restores the default configuration.
By default, a routing device does not send unicast RA messages in response to RS messages it receives on an interface.
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Usage Scenario
By default, a routing device does not send RA messages. However, a host that connects to a routing device uses these messages to obtain the prefix list and other configurations. You therefore need to run the undo ipv6 nd ra halt command to enable the routing device to send multicast RA messages. If the host connects to the routing device through a Layer 2 forwarding device but the forwarding device cannot forward multicast RA messages, you can run the ipv6 nd ra-unicast send enable command to enable the routing device to send unicast RA messages instead. In this case, the routing device sends unicast RA messages in response to RS messages it receives on an interface.