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To do... Use the command... Remarks
Automatically
generate a
link-local address
ipv6 address auto link-local
Configure an IPv6
link-local address
Manually assign a
link-local address
for an interface.
ipv6 address ipv6-address
link-local
Optional
By default, after an
IPv6 site-local
address or global
unicast address is
configured for an
interface, a
link-local address
will be generated
automatically.
z If XRN fabric ports are configured on a 3com switch 4500, no IPv6 address can be configured for
the switch.
z IPv6 unicast addresses can be configured for only one VLAN interface on a 3com switch 4500. The
total number of global unicast addresses and site-local addresses on the VLAN interface can be up
to four.
z After an IPv6 site-local address or global unicast address is configured for an interface, a link-local
address will be generated automatically. The automatically generated link-local address is the
same as the one generated by using the ipv6 address auto link-local command.
z The manual assignment takes precedence over the automatic generation. That is, if you first adopt
the automatic generation and then the manual assignment, the manually assigned link-local
address will overwrite the automatically generated one. If you first adopt the manual assignment
and then the automatic generation, the automatically generated link-local address will not take
effect and the link-local address of an interface is still the manually assigned one. If the manually
assigned link-local address is deleted, the automatically generated link-local address takes effect.
z You must have carried out the ipv6 address auto link-local command before you carry out the
undo ipv6 address auto link-local command. However, if an IPv6 site-local address or global
unicast address is already configured for an interface, the interface still has a link-local address
because the system automatically generates one for the interface. If no IPv6 site-local address or
global unicast address is configured, the interface has no link-local address.
Configuring IPv6 NDP
Configuring a static neighbor entry
The IPv6 address of a neighbor node can be resolved into a link-layer address dynamically through NS
and NA messages or statically through manual configuration.
You can configure a static neighbor entry in two ways:
z Mapping a VLAN interface to an IPv6 address and a link-layer address
z Mapping a port in a VLAN to an IPv6 address and a link-layer address
If you configure a static neighbor entry in the second way, make sure the corresponding VLAN interface
exists. In this case, the device associates the VLAN interface to the IPv6 address to uniquely identify a
static neighbor entry.