Related Documentation
Terms Used in IPv4/IPv6 Dual-Stack Documentation
Table 1 defines terms used in the IPv4/IPv6 dual-stack documentation.
Table 1: IPv4/IPv6 Dual-Stack Terms
Term | Definition |
|---|---|
Access network | Network that connects the subscriber premises directly to the subscriber’s service provider. |
BNG | Broadband network gateway. An IP edge router in which bandwidth and QoS policies may be applied. The BNG may encompass any or all of the functionality of B-RAS. |
CPE | Customer premises equipment on the subscriber network that connects the subscriber network to the BNG. |
Delegated addressing | Method of address assignment in which a host uses IPv6 prefixes to delegate IPv6 global addresses. In a dual-stack network, the CPE uses IPv6 prefixes that it receives to delegate global IPv6 addresses to individual subscriber equipment. |
Delegating router | Role of the BNG when it delegates IPv6 prefixes to the requesting router (the CPE). |
DHCPv6 IA | Identity association. A collection of addresses assigned to a client. Each IA contains one type of address. For example, IA_NA carries assigned addresses that are nontemporary addresses; IA_PD carries a prefix. |
DHCPv6 IA_PD | IA for prefix delegation. An IA that carries a prefix that is assigned to the requesting router. Instead of assigning a single address, IA_PD assigns a prefix or a complete subnet. Referred to as DHCPv6 prefix delegation. |
DHCPv6 IA_NA | IA for nontemporary addresses. An IA that carries assigned addresses that are not temporary addresses. DHCPv6 IA_NA is used to assign global IPv6 addresses. |
Global IPv6 address | Unique IPv6 address that identifies a single interface and allows the interface to access the IPv6 internet. |
IPv6 address prefix/prefix length | Combination of an IPv6 prefix (address) and a prefix length. The prefix takes the form ipv6-prefix/prefix-length and represents a block of address space (or a network). The /prefix-length indicates the number of contiguous, higher-order bits of the address that make up the network portion of the address. For example, 2001:DB8::/32 is an IPv6 prefix. |
IPCP | IPv4 Control Protocol. A PPP protocol that establishes the IPv4 link between the BNG and the CPE if you are using PPPoE in your access network. |
IPv6CP | IPv6 Control Protocol. A PPP protocol that establishes the IPv6 link between the BNG and the CPE if you are using PPPoE in your access network. |
Link-local address | Locally derived address that is designed to be used for addressing on a single link for purposes such as automatic address configuration, Neighbor Discovery, or when no routers are present. It is indicated by the prefix FE80::/10. In your dual-stack network, you can use a link-local address on the interface that connects the CPE and the BNG. |
NDRA | Neighbor Discovery Router Advertisement. An IPv6 protocol that is used in the dual-stack network to allow automatic addressing on the CPE WAN link. |
Neighbor dDiscovery | Protocol in the IPv6 protocol suite that allows nodes on the same link to advertise their existence to their neighbors, and to learn about the existence of their neighbors. |
Prefix list | Table that contains IPv6 prefixes. |
Requesting router | Role of the CPE when it requests IPv6 prefixes from the delegating router (the BNG). |
Router Advertisement (RA) | Message that the BNG periodically sends to hosts or sends in response to Router Solicitation (RS) requests from another host. The message includes IPv6 prefixes and other autoconfiguration information. In a dual-stack network, the router sends RAs to CPE devices on its access network. |
Router Solicitation (RS) | Message that hosts send to discover the presence of on-link routers. In a dual-stack network, CPE devices send RS messages to the BNG. |
Subscriber LAN | Residential or small network. |
Unnumbered address | Address that can be used on the router’s PPPoE loopback interface that connects to the CPE. |
