内网设备都获取全球单播地址

pppoe这边拨号已经获取的ipv6的地址以及前缀（60位），而且运营商给的ipv6地址会变动，导致原本手动写的静态没法用了，由于想要内网设备都获取全球单播地址，vlan10，20网关都在sw上面，路由器和交换机之间用vlan99连接，要怎么让下面的pc获取到全球单播地址.

自己尝试了一下前缀方法，但只能使vlan99获取ipv6，别的vlan就拿不到。拓扑和配置如下

R：

ipv6 dhcp pool stateless

option-group 1

interface Dialer0

ipv6 address auto

ipv6 address auto link-local

ipv6 dhcp client pd 1 rapid-commit option-group 1

interface Vlan-interface99

ipv6 mtu 1280

ipv6 dhcp select server

ipv6 dhcp server apply pool stateless

ipv6 address 1 0:0:0:1::1/63

undo ipv6 nd ra halt

ipv6 nd autoconfig other-flag

ipv6 nd ra interval 60 10

ipv6 nd ra dns server 240C：：6644 sequence 0

sw:

ipv6 dhcp pool 10

option-group 1

interface Vlan-interface99

ipv6 mtu 1280

ipv6 dhcp select server

ipv6 address 1 0:0:0:1::2/63

ipv6 address auto

ipv6 address auto link-local

ipv6 dhcp client pd 1 rapid-commit option-group 1

interface Vlan-interface10

ipv6 mtu 1280

ipv6 dhcp select server

ipv6 dhcp server apply pool 10

ipv6 address 1 0:0:0:2::1/63

ipv6 address auto

ipv6 address auto link-local

undo ipv6 nd ra halt

ipv6 nd autoconfig other-flag

ipv6 nd ra interval 60 10

ipv6 nd ra dns server 240C：：6644 sequence 0

interface Vlan-interface20

ipv6 mtu 1280

ipv6 dhcp select server

ipv6 dhcp server apply pool 10

ipv6 address 1 0:0:0:3::1/63

ipv6 address auto

ipv6 address auto link-local

undo ipv6 nd ra halt

ipv6 nd autoconfig other-flag

ipv6 nd ra interval 60 10

ipv6 nd ra dns server 240C：：6644 sequence 0

我看了sw的地址获取情况，只有vlan99有2408开头的，其他都是本地链路地址