HP 2520-8 Configuration Manual page 19

This option configures DHCPv6 on a VLAN, which initiates
transmission of DHCPv6 requests for service. If IPv6 is not
already enabled on the VLAN by the ipv6 enable command, this
option also enables IPv6 and causes the switch to autocon-
figure a link-local unicast address with an EUI-64 interface
identifier.
Notes: A DHCPv6 server does not assign link-local
addresses, and enabling DHCPv6 on a VLAN does not
affect a pre-existing link-local address configured on the
VLAN.
A DHCPv6-assigned address can be configured on a VLAN
when the following is true:
• The assigned address is not on the same subnet as a
previously configured autoconfig address.
• The maximum IPv6 address limit on the VLAN or the
switch has not been reached.
If a DHCPv6 server responds with an IPv6 address assign-
ment, this address is assigned to the VLAN. (The DHCPv6-
assigned address will be dropped if it has the same subnet as
another address already assigned to the VLAN by an earlier
autoconfig command.)
After verification of uniqueness by DAD, an IPv6 address
assigned to the VLAN by an DHCPv6 server is set to the
preferred and valid lifetimes specified in a router advertise-
ment received on the VLAN for the prefix used in the assigned
address, and is configured as a preferred address. (Refer to
the section titled "Address Lifetimes" on page 1-28.)
[rapid-commit]: Expedites DHCP configuration by using a two-
message exchange with the server (solicit-reply) instead of the
default four-message exchange (solicit-advertise- request-
reply).
Default: Disabled
The no form of the command removes the DHCPv6 option from
the configuration and, if no other IPv6-enabling command is
configured on the VLAN, disables IPv6 on the VLAN. (Refer to
"Disabling IPv6 on a VLAN" on page 1-12.)
To view the current IPv6 DHCPv6 settings per-VLAN, use show run.
IPv6 Addressing Configuration
Enabling DHCPv6
1-7