Subscriber Services: DHCPv6 server address pool for router advertisement

When a device functions as both DHCPv6 client and server, the prefix information received from the WAN side through DHCP-Prefix Delegation (PD) needs to be divided. This prefix information is used in multiple LAN side interfaces for Router-Advertisement (RA) or for DHCPv6 server address pools. This feature allows you to consistently divide the received prefix into sub-prefixes either for router advertisement or for DHCP local server.