Scoped Addresses
IPv6 uses a category of addresses called link-local addresses that are used solely on a
local subnet. Every IPv6 VLAN must have at least one link-local address. If a global IP
address is configured on a VLAN that has no link-local address, one is assigned
automatically by the switch. The link-local addresses start with the prefix fe80::/64.
As a result, a switch can have the same link local address assigned to different VLANs,
or different neighbors on different links can use the same link local address. Because
of this, there are cases where you need to specify an address and a VLAN/tunnel to
indicate which interface to use. For those cases, you can indicate the interface by
using a scoped address. To scope the address, append the VLAN/tunnel name to the end
of the address, separated by a percent sign (%). For example, to indicate the link local
address fe80::2 on VLAN finance, use the following
form:
fe80::2%finance
Scoped addresses also appear in the output of display commands.