1-10To do... Use the command... RemarksAutomaticallygenerate alink-local addressipv6 address auto link-localConfigure anIPv6 link-localaddress Manually assign alink-local addressfor an interface.ipv6 address ipv6-addresslink-localOptionalBy default, after anIPv6 site-localaddress or globalunicast address isconfigured for aninterface, a link-localaddress will begeneratedautomatically.z IPv6 unicast addresses can be configured for only one VLAN interface of a 3Com Switch 4210.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-localaddress will be generated automatically. The automatically generated link-local address is thesame 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 adoptthe automatic generation and then the manual assignment, the manually assigned link-localaddress will overwrite the automatically generated one. If you first adopt the manual assignmentand then the automatic generation, the automatically generated link-local address will not takeeffect and the link-local address of an interface is still the manually assigned one. If the manuallyassigned 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 theundo ipv6 address auto link-local command. However, if an IPv6 site-local address or globalunicast address is already configured for an interface, the interface still has a link-local addressbecause the system automatically generates one for the interface. If no IPv6 site-local address orglobal unicast address is configured, the interface has no link-local address.Configuring IPv6 NDPConfigure a static neighbor entryThe IPv6 address of a neighbor node can be resolved into a link-layer address dynamically through NSand 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 corresponding VLAN interfaceexists. In this case, the device associates the VLAN interface to the IPv6 address to uniquely identify astatic neighbor entry.
