Unable to Assign IPv6 Prefix Longer than /64 to PPPoE subscribers

[malik.naeem]

Hello,

We have an ASR9K serving as the BNG for our network. We are trying to implement dual-stack for our GPON PPPoE subscribers but we are failing to assign IPv6 prefixes longer than /64 (both WAN and delegated).

Following is the configuration that we are trying to use:

dynamic-template
 type ppp PPP_DUAL_STACK
  ppp authentication chap
  ppp ipcp dns 10.255.255.18 10.255.255.19
  ppp ipcp peer-address pool POOL_IPv4
  accounting aaa list bng_acct type session dual-stack-delay 30
  ipv4 unnumbered Loopback2
  ipv6 nd other-config-flag
  ipv6 nd framed-prefix-pool IPv6_GPON_WAN_POOL
  ipv6 enable
  dhcpv6 delegated-prefix-pool IPv6_GPON_LAN_POOL
  !
!
pool vrf default ipv6 IPv6_GPON_LAN_POOL
 prefix-length 104
 network 2412:1300:2000::/120
!
pool vrf default ipv6 IPv6_GPON_WAN_POOL
 prefix-length 110
 network 2412:1300:1000::/126
!

The PPPoE circuits work only if we increase the network size and change the prefix-length to /64. We want to use longer prefix-lengths.

Please guide.

Thanks

[doss270423]

dynamic-template
type ppp PPP_DUAL_STACK
ppp authentication chap
ppp ipcp dns 10.255.255.18 10.255.255.19
ppp ipcp peer-address pool POOL_IPv4
accounting aaa list bng_acct type session dual-stack-delay 30
ipv4 unnumbered Loopback2
ipv6 nd other-config-flag
ipv6 nd framed-prefix-pool IPv6_GPON_WAN_POOL
ipv6 enable
dhcpv6 delegated-prefix-pool IPv6_GPON_LAN_POOL
!
!
pool vrf default ipv6 IPv6_GPON_LAN_POOL
prefix-length 104
network 2412:1300:2000::/120
!
pool vrf default ipv6 IPv6_GPON_WAN_POOL
prefix-length 110
network 2412:1300:1000::/126
!
interface GigabitEthernet0/0
ipv6 address 2412:1300:2000::1/120
ipv6 nd prefix 2412:1300:2000::/120
!
interface GigabitEthernet0/1
ipv6 address 2412:1300:1000::1/126
ipv6 nd prefix 2412:1300:1000::/126
!

(This configuration will assign the following IPv6 prefixes to your PPPoE subscribers: * 2412:130)