Operation Manual – IPv6 ManagementH3C S3100 Series Ethernet Switches Chapter 1 IPv6 Configuration1-12Note:z IPv6 unicast addresses can be configured for only one VLAN interface of an H3CS3100 Series Ethernet Switches. Only one global unicast address or one site-localaddress can be configured for an interface.z After an IPv6 site-local address or global unicast address is configured for aninterface, a link-local address will be generated automatically. The automaticallygenerated link-local address is the same as the one generated by using the ipv6address auto link-local command.z The manual assignment takes precedence over the automatic generation. That is, ifyou first adopt the automatic generation and then the manual assignment, themanually assigned link-local address will overwrite the automatically generated one.If you first adopt the manual assignment and then the automatic generation, theautomatically generated link-local address will not take effect and the link-localaddress of an interface is still the manually assigned one. If the manually assignedlink-local address is deleted, the automatically generated link-local address takeseffect.z You must have carried out the ipv6 address auto link-local command before youcarry out the undo ipv6 address auto link-local command. However, if an IPv6site-local address or global unicast address is already configured for an interface,the interface still has a link-local address because the system automaticallygenerates one for the interface. If no IPv6 site-local address or global unicastaddress is configured, the interface has no link-local address.1.2.2 Configuring IPv6 NDPI. Configure a static neighbor entryThe IPv6 address of a neighbor node can be resolved into a link-layer addressdynamically 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 addressz Mapping a port in a VLAN to an IPv6 address and a link-layer addressIf you configure a static neighbor entry in the second way, make sure the correspondingVLAN interface exists. In this case, the device associates the VLAN interface to theIPv6 address to uniquely identify a static neighbor entry.
