Aussie Broadband IPv6 with Ubiquiti EdgeRouter Link to heading 

set interfaces ethernet eth0 address dhcp
set interfaces ethernet eth0 description AussieBB
set interfaces ethernet eth0 dhcpv6-pd pd 0 interface eth7 host-address '::1'
set interfaces ethernet eth0 dhcpv6-pd pd 0 interface eth7 no-dns
set interfaces ethernet eth0 dhcpv6-pd pd 0 interface eth7 prefix-id ':1'
set interfaces ethernet eth0 dhcpv6-pd pd 0 interface eth7 service slaac
set interfaces ethernet eth0 dhcpv6-pd pd 0 prefix-length /48
set interfaces ethernet eth0 dhcpv6-pd rapid-commit enable

Then, to renew your IPv6 address:

renew dhcpv6-pd interface eth0