HP 2520-24, Configuration Manual

Page: 17 / 110

1-5
IPv6 Addressing Configuration
Enabling Autoconfiguration of a Global Unicast Address and a Default Router Identity on a VLAN
To view the current IPv6 autoconfiguration settings per-VLAN, use show run .
Implements unicast address autoconfiguration as follows:
■ If IPv6 is not already enabled on the VLAN, this command
enables IPv6 and generates a link-local (EUI- 64) address.
■ Generates router solicitations (RS) on the VLAN.
■ If a router advertisement (RA) is received on the VLAN,
the switch uses the route prefix in the RA to configure a
global unicast address. The device identifier for this
address will be the same as the device identifier used in
the current link-local address at the time the RA is
received. (This can be either a statically configured or the
(automatic) EUI-64 device identifier, depending on how
the link-local address was configured.) For information
on EUI- 64, refer to “Disabling IPv6 on a VLAN” on page 1-
12.) If an RA is not received on the VLAN after autoconfig
is enabled, a link-local address will be present, but no
global unicast addresses will be autoconfigured.
Notes: If a link-local address is already configured on the
VLAN, a later, autoconfigured global unicast address uses
the same device identifier as the link-local address.
Autoconfigured and DHCPv6-assigned global unicast
addresses with the same prefix are mutually exclusive on
a VLAN. On a given switch, if both options are configured
on the same VLAN, then only the first to acquire a global
unicast address will be used.
After verification of uniqueness by DAD, an IPv6 address
assigned to a VLAN by autoconfiguration is set to the preferred
and valid lifetimes specified by the RA used to generate the
address, and is configured as a preferred address. (Refer to
“View the Current IPv6 Addressing Configuration” on page 1-
17.)
Default: Disabled.
The
no
form of the command produces different results,
depending on how IPv6 is configured on the VLAN:
If IPv6 was enabled only by the
autoconfig
command, then
deleting this command disables IPv6 on the VLAN. (Refer to
“Disabling IPv6 on a VLAN” on page 1-12.)