以 Dialer1 接口为例：

    1. <Huawei>system-view
    2. [Huawei]interface Dialer 1
    3. [Huawei-Dialer1]ipv6 enable
    4. [Huawei-Dialer1]ipv6 address auto link-local
    5. [Huawei-Dialer1]ipv6 address auto global default
    6. [Huawei-Dialer1]ipv6 mtu 1492 # 针对 PPPoE拨号
    7. [Huawei-Dialer1]dhcpv6 client pd ipv6pd # 通过 DHCPv6 客户端获取 pd 前缀，别名为 ipv6pd
    8. [Huawei-Dialer1]quit