Dhcpv6 Prefix Delegation; Ipv6 Ipoe Subscriber Support; Configuring Ipv6 Ipoe Subscriber Interface - Cisco ASR 9000 Series Configuration Manual

DHCPv6 Features
Checkpoint and Shadow Database
The checkpoint and shadow database are actively maintained on the RSP and contains a copy of all bindings
from all linecards. The checkpoint database has client or subscriber bindings from the subscribers over
interfaces in its scope. The shadow database on the active RSP updates the standby shadow database.
DHCPv6 Hot Standby
DHCPv6 Hot Standby is a process that is supported only on RSPs. Whenever the active RSP stops responding,
it is instantly replaced by a standby RSP. The standby RSP takes over processing when it becomes active.

DHCPv6 Prefix Delegation

The DHCPv6 prefix delegation is a mechanism of delegating IPv6 prefixes to a client. The prefix delegation
feature can be used to manage link, subnet, and site addressing changes.
An Internet Service Provider (ISP) assigns prefix to a customer for use within the customer's network. Prefix
delegation occurs between a provider edge (PE) device and customer premises equipment (CPE), using the
DHCPv6 prefix delegation option. After the ISP has delegated prefixes to a customer, the customer may
further subnet and assign prefixes to the links in the customer's network.
By default, the prefix delegation feature is always enabled.

IPv6 IPoE Subscriber Support

An IPv6 subscriber transmits IPv6 address that is created using the DHCPv6 protocol. The IPv6 subscribers
run IPv6 on the CPE device and are connected to BNG through a Layer-2 network or through Layer-2
aggregation. The IPv6 subscribers are supported when they are directly connected to the BNG or through a
Layer-2 aggregator.
To enable IPv6 IPoE subscriber support, the DHCPv6 profile needs to be explicitly configured on the subscriber
interface. For more information, see
FSOL Handling
The DHCPv6 First Sign of Life (FSOL) handling is only supported for IPoE sessions. DHCPv6 handles
SOLICIT packet from client as FSOL packet for IPoE session validation and creation. The IPoE session gets
created, as long as the configuration exists and the subscriber information is validated successfully.

Configuring IPv6 IPoE Subscriber Interface

Perform this task to configure IPoE subscriber interface.
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Configuration Guide,
Release 4.3.x
146
Configuring IPv6 IPoE Subscriber Interface, on page
Establishing Subscriber Sessions
146.
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