dhcpv6 snooping user-bind detect confirm-client enable

Function

The dhcpv6 snooping user-bind detect confirm-client enable command enables the confirm-client probing function of DHCPv6 snooping.

The undo dhcpv6 snooping user-bind detect confirm-client enable command disables the confirm-client probing function of DHCPv6 snooping.

By default, the confirm-client probing function is enabled.

Format

dhcpv6 snooping user-bind detect confirm-client enable

undo dhcpv6 snooping user-bind detect confirm-client enable

Parameters

None

Views

System view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

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 confirm-client is online. The DHCPv6 snooping entries are promptly deleted when the confirm-clients go offline.

Prerequisites

The dhcp snooping enable ipv6 command has been executed to enable DHCPv6 snooping.

Example

# Enable confirm-client probing of DHCPv6 snooping.

<HUAWEI> system-view
[HUAWEI] dhcp enable
[HUAWEI] dhcp snooping enable ipv6
[HUAWEI] dhcpv6 snooping user-bind detect confirm-client enable