A link-local IPv6 address is begging with the bit pattern 1111 1110 1000 0000 or FE80::10. Link-local means packets sourced from or destined to a link-local address cannot leave the local link. Link-local address is used for detecting duplicated IPv6 address with ICMPv6 neighbor discovery protocol in order to communicate with devices which don’t have global unicast address.
Link-local address is automatically generated by below actions. Link-local IPv6 address format is FE80::/64 + EUI-64 host address.
1. IPv6 enable command
2. Configuring global unicast IPv6 address
Of course link-local address can be manually configured with link-local option on the end of IPv6 address interface level command.
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