Most IPv6 implementation plans make use of both static IPv6 address configuration and dynamic configuration options. As is the case with IPv4, the plan assigns infrastructure devices with static addresses, with client hosts using one of the two dynamic methods for address assignment. IPv6 addressing includes many more options than IPv4, and as a result, many more config-uration options exist. A router interface can be configured with a static global unicast IPv6 address, either with or without using the EUI-64 option. Although less likely, a router could be configured to dynamically learn its IPv6 address with either stateful DHCP or stateless autoconfig. The router interface could be configured to either not use a global unicast address, instead relying solely on its link local address, or to borrow another interface’s address using the IPv6 unnumbered feature. Following Table summarizes the IPv6 configuration commands and their meanings.
| Command | Description |
| ipv6 address address/length | Static configuration of the entire IPv6 unicast ad- dress. |
| ipv6 address prefix/length eui-64 | Static configuration of the first 64 address bits; the router derives the last 64 bits with EUI-64. |
| ipv6 address autoconfig | Router uses stateless autoconfig to find address. |
| ipv6 address dhcp | Router uses stateful DHCP to find address. |
| ipv6 unnumbered interface-type num- ber | Uses the same IPv6 unicast address as the refer- enced interface. |
| ipv6 enable | Enables IPv6 on the interface, but results in only a link local address. |
| ipv6 address address link-local | Overrides the automatically created link local ad- dress. The configured value must conform to the FE80::/10 prefix. |
| ipv6 address address/length anycast | Designates that the unicast address is an anycast. |
Configuring Static IPv6 Addresses on Routers
R2# show running-config
! lines omitted for brevity
interface FastEthernet0/0
ipv6 address 2000:0:0:4::/64 eui-64
!
interface FastEthernet0/1
ipv6 address 2000:0:0:2::2/64
!
interface Serial0/0/1
ipv6 address 2000:0:0:1::/64 eui-64
!
!
R2# show ipv6 interface brief
FastEthernet0/0 [up/up]
FE80::213:19FF:FE7B:5004
2000::4:213:19FF:FE7B:5004
FastEthernet0/1 [up/up]
FE80::213:19FF:FE7B:5005
2000:0:0:2::2
Serial0/0/0 [administratively down/down]
unassigned
Serial0/0/1 [up/up]
FE80::213:19FF:FE7B:5004
2000::1:213:19FF:FE7B:5004
Serial0/1/0 [administratively down/down]
unassigned
Serial0/1/1 [administratively down/down]
unassigned
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