Prefix Delegation

Prefix delegation allows a DHCPv6 server assign prefixes chosen from a global pool to DHCPv6 clients. The DHCPv6 client can then configure an IPv6 address on its LAN interface using the received prefix. It then sends router advertisements that include the prefix, allowing other devices to use auto-configuration to configure their own IPv6 addresses.

The PD device will be connected to the DHCPv6 server. The DHCPv6 server should have prefix6 configured. The PD device receives the prefix from the DHCPv6 server. The hosts connected to the PD device receives the IPv6 address in the prefix received by the PD device.

The following example assigns a range of IPv6 prefixes to a subnet.

device# configure terminal
device(config)# ipv6 dhcp6-server enable
device(config-dhcp6)# subnet6 3ffe:501:ffff:100::/64
device(config-dhcpv6-subnet)# prefix6 3ffe:501:ffff:100::/64 3ffe:501:ffff:103::/64