After a binding entry is generated for a client using the DHCPv6 Confirm packet, this client is a confirm-client. When the client goes online again, it sends a DHCPv6 Confirm packet.
When a user-side interface receives the DHCPv6 Confirm packet, a DHCPv6 snooping binding entry is generated for the client. Because the DHCPv6 Confirm packet does not contain lease information, the binding entry of the client cannot be deleted immediately when the client goes offline. This occupies binding table space and new users may fail to go online.
After the confirm-client probing function is enabled, DHCPv6 snooping periodically sends DAD NS packets to detect whether the client is online. The DHCPv6 snooping entries are promptly deleted when the confirm-clients go offline.
The system view is displayed.
The confirm-client probing function of DHCPv6 snooping is enabled.
By default, the confirm-client probing function is enabled.
The number of times and interval at which the DAD NS packets are sent are set.
By default, a DAD NS packet is sent up to three times at the interval of 180 seconds.