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Methods for Obtaining IPv6 Global Addresses for DHCPv6 IA_NA
You can set up the BNG to select global IPv6 addresses to be delegated to the requesting router in one the following ways:
- An external source such as a AAA RADIUS server or a DHCP server using the DHCPv6 relay agent.
- Dynamic assignment from a local pool of addresses that is configured on the BNG
Using a AAA RADIUS Server to Obtain IPv6 Addresses for DHCPv6 IA_NA
When the BNG needs to obtain a global IPv6 for the CPE WAN link and optionally a DHCPv6 prefix, it uses the values in one of the following RADIUS attributes:
- Framed-IPv6-Prefix—The attribute contains a global IPv6 address with a prefix length of 128.
- Framed-IPv6-Pool—The attribute contains the name of an address-assignment pool configured on the BNG from which the BNG can select a global IPv6 address to send to the CPE.
Both attributes are sent from the RADIUS server to the BNG in RADIUS Access-Accept messages.
