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IPv6 Prefix-Delegation with dual stateless ISPs

Hello,

I have a simple working IPv6 configuration with stateless autoconfig on Dialer1 and it is working fine.  My config is this:

!
ipv6 unicast-routing
!
ipv6 dhcp pool BVI1_DHCP
 import dns-server
 import domain-name
!
interface Dialer1
 description connected to Internet through VDSL 
 mtu 1492
 ip address negotiated 
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip flow ingress
 ip nat outside
 ip virtual-reassembly in
 encapsulation ppp
 ip tcp adjust-mss 1452
 dialer pool 1
 dialer idle-timeout 0
 dialer-group 1
 no cdp enable
 ipv6 address autoconfig default
 ipv6 enable
 ipv6 verify unicast reverse-path
 ipv6 dhcp client pd ASSIGNED-PREFIX
 ipv6 traffic-filter IPV6IN in
 ppp authentication chap pap callin
 ppp chap hostname xxxx@myISP-A.com
 ppp chap password xxxxxxxxxxxxxxxxxx
 ppp pap sent-username xxxx@myISP-A.com password xxxxxxxxxxxxxxxxxx
 ppp ipcp dns request accept
!
interface BVI1
 mac-address b000.abcd.abcd
 ip address 192.168.x.x 255.255.255.0
 no ip redirects
 no ip unreachables
 ip mtu 1476
 ip flow ingress
 ip nat inside
 ip virtual-reassembly in
 ip tcp adjust-mss 1436
 ipv6 address ASSIGNED-PREFIX ::/64 eui-64
 ipv6 enable
 ipv6 nd other-config-flag
 ipv6 verify unicast reverse-path
 ipv6 dhcp server BVI1_DHCP
!
ipv6 route ::/0 Dialer1
!

But I also have another stateless connection over Dialer2 which i want to use it concurrently :

!
interface Dialer2
 mtu 1492
 ip address negotiated 
 no ip redirects
 no ip unreachables 
 no ip proxy-arp
 ip flow ingress
 ip nat outside
 ip virtual-reassembly in 
 encapsulation ppp
 ip tcp adjust-mss 1452
 dialer pool 2
 dialer idle-timeout 0
 dialer-group 2
 no cdp enable
 ipv6 address FE80::ABCD:ABCD:ABCD:766C link-local
 ipv6 address autoconfig
 ipv6 enable
 ipv6 dhcp client pd ASSIGNED-PREFIX-Dialer2
ipv6 traffic-filter IPV6IN in ppp authentication chap pap callin ppp chap hostname xxxx@myISP-B.com ppp chap password xxxxxxxxxxxxxx ppp pap sent-username xxxx@mymyISP-B.com password xxxxxxxxxxxxxx ppp ipcp dns request accept !

As I said and before, under IPv4 everything is working fine and I am able to route specific traffic there or doing some load balancing with CEF etc.  Now  regarding IPv6, as you can see, there is a prefix-delegation request on Dialer1 which acquires the assigned prefix from ISP-A connection and I am able to use it with my inside interface (BVI1) ip.  What I want to do is to be able to acquire the prefix AND from my ISP-B and use it in BVI1 as an additional ip:

!
interface BVI1
 mac-address abcd.abcd.abcd
 ip address 192.168.x.x 255.255.255.0
 no ip redirects
 no ip unreachables
 ip mtu 1476
 ip flow ingress
 ip nat inside
 ip virtual-reassembly in
 ip tcp adjust-mss 1436
 ipv6 address ASSIGNED-PREFIX ::/64 eui-64
 ipv6 address ASSIGNED-PREFIX-Dialer2 ::/64 eui-64
ipv6 enable ipv6 nd other-config-flag ipv6 verify unicast reverse-path ipv6 dhcp server BVI1_DHCP !

Unfortunately, ipv6 dhcp client pd ASSIGNED-PREFIX-Dialer2 seems it does not working for some reason. However Dialer2 is getting GUA and seems working.  What I am doing wrong???

cisco#sh ipv6 int d2
Dialer2 is up, line protocol is up
  IPv6 is enabled, link-local address is FE80::ABCD:ABCD:ABCD:766C
  No Virtual link-local address(es):
  Stateless address autoconfig enabled
  Global unicast address(es):
    2A02:XXX:XXX:ABCD:ABCD:ABCD:ABCD:766C, subnet is 2A02:XXX:XXX:XXXX::/64 [EUI/CAL/PRE]
      valid lifetime 2591878 preferred lifetime 604678
  Joined group address(es):
    FF02::1
    FF02::2
    FF02::1:FFE0:766C
  MTU is 1492 bytes
  ICMP error messages limited to one every 100 milliseconds
  ICMP redirects are enabled
  ICMP unreachables are sent
  Input features: Common Flow Table Stile classification On Cypher Text Dialer i/f override Access List Verify Unicast Reverse-Path Common Flow Table Post VPN Stile classification On Clear Text
  Output features: Common Flow Table Stile Classification CCE Classification Zone based Firewall Dialer idle reset
  Inbound access list IPV6IN
 IPv6 verify source reachable-via rx, allow default
   0 verification drop(s) (process), 0 (CEF)
   0 suppressed verification drop(s) (process), 0 (CEF)
  ND DAD is enabled, number of DAD attempts: 1
  ND reachable time is 30000 milliseconds (using 30000)
  ND advertised reachable time is 0 (unspecified)
  ND advertised retransmit interval is 0 (unspecified)
  ND router advertisements live for 1800 seconds
  ND advertised default router preference is Medium
  ND RAs are suppressed (periodic)
  Hosts use stateless autoconfig for addresses.
cisco#sh ipv6 general-prefix
IPv6 Prefix ASSIGNED-PREFIX, acquired via DHCP PD
  XXXX:XXX:XXX:XXXX::/56 Valid lifetime 69931, preferred lifetime 69931
   BVI1 (Address command)
IPv6 Prefix ASSIGNED-PREFIX-Dialer2, acquired via DHCP PD
   BVI1 (Address command)

And even if I am trying to associate the ASSIGNED-PREFIX-Dialer2 prefix to BVI2, remains empty.  Does this means that you can only acquire one prefix???? 

 

Thanks for your time

 

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