Link Local Addresses
Link-local IPv6 addresses are automatically generated on IPv6-enabled interfaces.
Use the command:
on an interface to enable IPv6 on an interface.
Uses the address block FE80::/10 (FE80:: FBFE:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF)
However, the standard states that the 54 bits after FE80/10 should be all 0, so you won't see link-local addresses beginning with FE9, FEA or FEB. Only FE8.
The interface ID is generated using EUI-64 rules.
Link-local means that these addresses are used for communication within a single link (subnet). Routers will not route packets with a link-local destination IPv6 address.
Common uses of link-local addresses:
routing protocol peering (OSPFv3 uses link-local addresses for neighbor adjacencies).
next-hop addresses for static routes.
Neighbor Discovery Protocol (NDP, IPv6's replacement for ARP) uses link-local addresses to function.
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