Dealing with dynamically changing IPV6 PD, other than ROAS or manually changing ipv6 local pool, cisco router.

Good day,

With the changing PD from ISP, I have reached to two solutions so far to keep up with the changing PD,

Bridged ONT ----- ISR1K ---- C9200

​

1. Simplest, router on stick, losing the InterVlan routing on L3 switch
2. Manually re-setting up the DHCP6 server on cisco router every time the PD changes.

would be grateful, If anyone knows a better way dealing with the changing PD, or a method to have the "IPV6 local pool" automatically updated every time a new PD allocated by ISP.

​

​

Router config:

interface Dialer0

mtu 1492

ip address negotiated

no ip redirects

no ip unreachables

no ip proxy-arp

ip nat outside

zone-member security WAN

encapsulation ppp

ip tcp adjust-mss 1452

dialer pool 1

no cdp enable

ipv6 address autoconfig default

ipv6 enable

ipv6 mtu 1492

ipv6 tcp adjust-mss 1432

ipv6 dhcp client pd hint ::/56

ipv6 dhcp client pd STC

ipv6 dhcp client request vendor

ppp authentication chap callin

ppp chap hostname xxxxxxx

ppp chap password xxxxxxx

ppp ipcp route default

​

ipv6 local pool STC2 2001:16hh:hhhh:hhhh::/56 60

​

ipv6 dhcp pool DHCP6

prefix-delegation pool STC2 lifetime 84199 84199

​

interface GigabitEthernet0/0/0

ip address 192.168.0.1 255.255.255.252

ip nat inside

zone-member security LAN

negotiation auto

ipv6 address STC ::1:0:0:0:1/64

ipv6 dhcp server DHCP6