3.1.b (ix) DHCPv6 prefix delegation

 

IPv6 prefix delegation is a way for upstream routers to assign subnets to downstream DHCP servers/routers.

This has more of a use case in the ISP world where the ISP wants to assign specific public blocks to clients.

 

 

Here is the configuration:

ISP-R1:

en
conf t

ipv6 unicast-routing

ipv6 local pool DHCPPOOLDELEGATION 2000:1111:9900::/40 48

ipv6 dhcp pool DHCPPOOL
prefix-delegation pool DHCPPOOLDELEGATION lifetime 1800 600
link-address 2000:9999::1/64
dns-server 2000:9999::1
domain-name mytest.com
ipv6 dhcp server DHCPPOOL
exit



int g0/0
ipv6 enable
ipv6 address 2000:9999:1/64
ipv6 dhcpserver DHCPPOOL
no shut

ISP-R2:

en
conf t

ipv6 unicast-routing

int g0/0
ipv6 enable
ipv6 address autoconfig default
ipv6 dhcp client pd prefix-from-provider
no shut
exit

int g0/1
ipv6 enable
ipv6 address prefix-from-provider ::1:1/64
no shut

CLIENT:

en
conf t
ipv6 unicast-routing

int g0/1
ipv6 enable
ipv6 address autoconfig default

Source:
https://www.cisco.com/c/en/us/support/docs/ip/ip-version-6-ipv6/113141-DHCPv6-00.html