Stateless Address Autoconfiguration (SLAAC) is a form of IPv6 configuration in which an IPv6 gateway device can assign IPv6 addresses to clients from its own prefix. Unlike Dynamic Host Configuration Protocol version 6 (DHCPv6), SLAAC does not support more granular administrative control over the configuration
Router3(config)#interface fastethernet 0/0
Router3(config-if)#ipv6 enable
Router3(config-if)#ipv6 address autoconfig
The ipv6 address autoconfig command configures an interface to automatically assign itself a global unicast IPv6 address using SLAAC. SLAAC configurations occur based on information that is sent in router advertisements from an IPv6 gateway operating on the same network segment. When the link-local interface is active on the segment, it can announce itself and receive router advertisements from an IPv6 router that is operating on the same segment. If an IPv6 router exists and can function as an IPv6 gateway, it will advertise that functionality as well as the globally unique prefix with which it is configured and with which connected nodes should be used
#show ipv6 interface fastethernet ( interface )
