Dhcpv6 Server And Dhcpv6 Proxy; Enabling Dhcpv6 For Different Configuration Modes - Cisco ASR 9000 Series Configuration Manual

Establishing Subscriber Sessions

DHCPv6 Server and DHCPv6 Proxy

DHCPv6 Server and DHCPv6 Proxy
The DHCPv6 server always uses stateful address assignment. On receiving a valid request, the DHCPv6
server assigns IPv6 address or prefix and other configuration attributes such as domain name, domain name
server (DNS) address to requesting clients.
A DHCPv6 Relay or Proxy forwards a DHCPv6 message from a client to a server. A DHCPv6 Relay can use
either stateless or stateful address assignment. The DHCPv6 Stateless Relay agent acts as an intermediary to
deliver DHCPv6 messages between clients and servers. The Relay does not store or keep track of information
such as client addresses or the lease time. The DHCPv6 Relay is also known as a Stateless Relay. On the other
hand, the DHCPv6 Stateful Relay agent, also known as DHCP proxy, not only forwards a DHCPv6 message
from a client to the server, but also keeps track of the client's addresses and lease time. Hence, DHCPv6 Proxy
is also known as Stateful Relay. DHCPv6 supports a standalone proxy.
DHCPv6 Proxy enables inserting remote-ID and interface-ID options. The DHCPv6 Proxy uses the interface-ID
in addition to remote-ID to choose the interface on which to send the response towards client.
DHCPv6 can be enabled on different configuration modes. For more information about configuring DHCPv6
on different configuring modes, see Enabling DHCPv6 for Different Configuration Modes, on page 139. For
more information about setting the DHCPv6 parameters, see Setting Up DHCPv6 Parameters, on page 143.
DHCP relay is not supported for BNG.
Note

Enabling DHCPv6 for Different Configuration Modes

Perform this task to enable DHCPv6 for different configuration modes such as global, server profile, proxy
profile configuration modes, and server profile class and proxy profile class sub-configuration modes.
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Configuration Guide, Release
4.3.x
OL-28375-03 139