code: def get_vpn6_table(self):
          
          vpn_table = self._global_tables.get(RF_IPv6_VPN)
          # Lazy initialize the table.
          if not vpn_table:
              vpn_table = Vpnv6Table(self._core_service, self._signal_bus)
              self._global_tables[RF_IPv6_VPN] = vpn_table
              self._tables[(None, RF_IPv6_VPN)] = vpn_table
  
          return vpn_table
docs: Returns global VPNv6 table.
  
          Creates the table if it does not exist.