R3303-HP HSR6800 Routers Layer 3 - IP Services Configuration Guide

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Prefix selection process
To configure a DHCPv6 server to assign IPv6 prefixes to DHCPv6 clients, you must apply an address pool
on the receiving interface of the DHCPv6 server. Upon receiving a request, the DHCPv6 server searches
all address pools for a static IPv6 prefix bound to the client.
• If a match is found in an address pool, the server assigns the client the IPv6 prefix and other
configuration parameters in the address pool.
• If no match is found, the DHCPv6 server assigns an IPv6 prefix and other configuration parameters
from the address pool applied on the receiving interface.
Address selection process
Upon receiving a request for an IPv6 address, the DHCPv6 server searches all address pools for a static
IPv6 address bound to the client. If a match is found in an address pool, the server assigns the IPv6
address and other configuration parameters in the address pool to the DHCPv6 client. If no match is
found, the DHCPv6 server selects an address pool as follows:
1. Selects the DHCPv6 address pool applied on the receiving interface.
2. If no DHCPv6 address pool is applied on the receiving interface, selects an address pool as
follows:
{ If the source IPv6 address of the request is a link-local address, the client is on the same link as
the receiving interface, so the DHCPv6 server selects an address pool that maximally matches
the earliest configured IPv6 address of the interface.
{ If the DHCPv6 request is from a DHCPv6 relay agent, the DHCPv6 server selects an address
pool that maximally matches the link address (which is the address of the DHCPv6 relay agent
nearest to the DHCPv6 client) in the request.
3. Selects an IPv6 address and other configuration parameters from the address pool.
DHCPv6 server configuration task list
Task Remarks
Enabling the DHCPv6 server Required.
Configuring the DHCPv6 server to assign IPv6 prefixes to DHCPv6 clients
Use either configuration.
Configuring the DHCPv6 server to assign IPv6 addresses to DHCPv6 clients
Configuring network parameters in a DHCPv6 address pool Optional.
Enabling the DHCPv6 server on an interface Required.
Configuration prerequisites
Before you configure the DHCPv6 server, enable IPv6 by using the ipv6 command. For more information
about the ipv6 command, see Layer 3—IP Services Command Reference.