IPv6 link-local address

A link-local address in IPv6 is an address that is automatically assigned to an IPv6 interface. An IPv6 link-local address:

  • is assigned within the FE80::/10 range
  • is automatically generated on an IPv6 enabled interface
  • is unique only on that particular network segment

A link local address can be generated in various ways depending upon the operating system of the device in question. It can be generated either using EUI-64, randomly, or can be manually assigned. A Cisco IOS device by default uses the EUI-64 method to generate the link-local address. A Microsoft Windows device will generate the link-local address randomly by default.

The link-local address is used for neighbor discovery and routing protocol communication.