Nice People HELP ME!!! IPv6 over PPPoE Configuration on Cisco 7206VXR

Question

I have a 7206VXR which connects to a DSLAM via the router's ATM/DS3 interface. A CPE home router connects to the DSLAM. So it's like:
PC -----ethernet---- CPE Router ------ dsl line ------ DSLAM ----- atm/pppoe ------- BVI/Virtual-Template/PPPoE on Cisco 7206VXR
Now the problem is:
- PC CAN ping the BVI interface of Cisco, but NOT beyond that. For instance he can't ping 7206's loopback ipv6 address.
- I found something interesting on the CPE, that CPE itself can't ping BVI interface of Cisco, AND it doesn't have a default gateway ::/0 set on itself. I manually added a default router like "route -A inet6 add ::/0 gw <BVI's IPv6 addr>", and the problem got solved and PC can ping Cisco's loop back IP now. But this is not a solution since I want this thing to be automatically ready.
Note both CPE and PC are happy with global IPv6 addressed assigned.
I believe this problem is related to how PPPoE/IPCPv6 handles addresses and prefixes.
Ok, now some configuration details: I use 2001:7:7::/64 for the "WAN" side of CPE, and 2001:8:8::/64 for its LAN side (PCs). And here's the Cisco config (only related stuff is shown here):
ipv6 unicast-routing
ipv6 cef
ipv6 dhcp pool foo
prefix-delegation pool test
address prefix 2001:7:7::/64
bridge irb
bba-group pppoe global
virtual-template 2
sessions max limit 256
interface Loopback0
no ip address
ipv6 address 2001:9:9::1/64
ipv6 enable
interface Virtual-Template2
description Public PPP CHAP
mtu 1492
ip unnumbered BVI1
ip pim sparse-dense-mode
ip igmp version 3
ipv6 unnumbered BVI1
ipv6 enable
ipv6 mtu 1492
ipv6 nd managed-config-flag
ipv6 nd other-config-flag
ipv6 nd router-preference High
no ipv6 nd ra suppress
ipv6 dhcp server foo
peer default ip address dhcp-pool Public
peer default ipv6 pool test
ppp authentication chap
ppp pap refuse
interface BVI1
description Public IP ADSL
ip address 12.230.197.129 255.255.255.224
ip pim sparse-dense-mode
ip igmp version 3
ipv6 address 2001:7:7::1/64
ipv6 enable
ipv6 mtu 1492
ipv6 nd managed-config-flag
ipv6 nd other-config-flag
ipv6 nd router-preference High
no ipv6 nd ra suppress
ipv6 nd ra lifetime 60
ipv6 nd ra interval 40
ipv6 local pool test 2001:8:8::/56 64
NICE PEOPLE PLS HELP ME! ^_^

Answer 1

Thanks Andrew for your response and sorry for the confusion: actually I didn't include all my config lines. For bridging, actually I did what you mentioned and everything works fine with IPv4:
interface ATM1/0.3 multipoint
description Public DHCP
bridge-group 1
pvc 1/1060
  encapsulation aal5snap
bridge 1 protocol ieee
bridge 1 route ip
bridge 2 protocol ieee
bridge 2 route ip