IPv6 Addressing
IPv6 Address Sources
Static Address Configuration
Generally, static address configuration should be used when you want
specific, non-default addressing to be assigned to a VLAN interface. For IPv6,
DHCP use is indicated for conditions such as the following:
■ address conventions used in your network require defined control
■ the task of static addressing is not so extensive as to be impractical due
to the number of addresses and/or interfaces needing configuration
If IPv6 is not already enabled on a VLAN interface, the following is true:
■ Statically configuring a link-local address on the interface also enables
IPv6.
■ Statically configuring a global unicast or anycast address also enables
IPv6 and generates a link-local address.
Statically configured global unicast addresses can be used in addition to
stateless addresses on the same interface. However, because only one link-
local address is allowed on a VLAN interface (fe80::), static configuration of
a link-local address automatically replaces an existing link-local address.
Note For a statically configured global unicast address to be routable, a gateway
router must be transmitting router advertisements on the VLAN that include
the prefix used in the statically configured address. If the VLAN is not receiving
an RA with this prefix, the address is listed as “preferred”, but is not used.
Statically configured IPv6 addresses saved to the startup-config file (by using
write memory) remain across a reboot and are permanent, unless statically
removed by no ipv6 address < ipv6-addr >.
For more information and the CLI command for static address configuration,
refer to “Configuring a Static IPv6 Address on a VLAN” on page 4-11.
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