Operation Manual – IPv6 Management
H3C S3100 Series Ethernet Switches Chapter 1 IPv6 Configuration
1-12
 Note:
z IPv6 unicast addresses can be configured for only one VLAN interface of an H3C
S3100 Series Ethernet Switches. Only one global unicast address or one site-local
address can be configured for an interface.
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.
1.2.2 Configuring IPv6 NDP
I. Configure 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.
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