Question about configuring Global IPv6 address on interface

It seems when configuring a global IPv6 address on a layer 3 interface, we cannot specify the whole 128 bit address. We can only specify the prefix and leave the last 64 bits to be generated by the router:
http://www.cisco.com/en/US/docs/ios-xml/ios/ipv6/configuration/12-2sx/ip6-addrg-bsc-con.html#GUID-70188E8F-16D2-4DD1-8DE2-70073FF37CC8
Then how can I specify the router address to the client using DHCPv6? Do I have to keep the router RAs while using DHCPv6 together?
Thanks.
zhenning

Hi Leo,
Where is it stated in this doc that you can't configure a /128 ?
Router(config-if)#ipv add 2001::1/128
Router(config-if)#do sh ipv int lo0
Loopback0 is up, line protocol is up
  IPv6 is enabled, link-local address is FE80::9CD7:2EFF:FEF0:99FA
  Global unicast address(es):
    2001::1, subnet is 2001::1/128
  Joined group address(es):
    FF02::1
    FF02::2
    FF02::1:FF00:1
    FF02::1:FFF0:99FA
  MTU is 1514 bytes
  ICMP error messages limited to one every 100 milliseconds
  ICMP redirects are enabled
  ND DAD is not supported
  ND reachable time is 30000 milliseconds
The IOS accepts it on any interface but it will only work for Loopbacks.
I configured a /126 between 2 serials and it worked without any problem but for prefix-advertisement through RA  to work then you must configure a /64.
Regards.
Alain

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