3Com Switch 8800 Advanced Software V5 Configuration Guide

222 CHAPTER 23: IPV6 BASICS CONFIGURATION
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■ 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. If a link-local address is
manually assigned to an interface, this link-local address takes effect. If the
manually assigned link-local address is removed, the automatically generated
link-local address takes effect.
■ 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. You must delete the manually assigned link-local address before
adopting the automatic generation.
■ You must carry out the ipv6 address auto link-local command before 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.
The device uniquely identifies a static neighbor entry according to the IPv6 address
and the layer 3 interface ID. Currently, there are two configuration methods:
■ Configure an IPv6 address and link-layer address for a layer 3 interface.
■ Configure an IPv6 address and link-layer address for a port in a VLAN.
Follow these steps to configure a static neighbor entry:
Configure an
IPv6 link-local
address
Automatically
generate a
link-local address
ipv6 address auto
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.
Manually assign a
link-local address
for an interface
ipv6 address
ipv6-address link-local
To do... Use the command... Remarks
To do... Use the command... Remarks
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