Indicates the VLAN-based IPv6 dad proxy function.
Options:
1. enable(1) -indicates that the IPv6 dad proxy function is enabled.
2. disable(2) -indicates that the IPv6 dad proxy function is disabled.
This leaf is optional for creating a VLAN service profile.
The IPv6 dad proxy function in the global mode can be set in
hwIpDslamIpv6DadProxySwitch of HUAWEI-IPDSLAM-SECURITY-MIB.
The final status of the IPv6 dad proxy function is determined by its
global-level switch and VLAN-level switch. The IPv6 dad proxy function
of a VLAN is enabled only when the switches at both levels are enabled.