They can also
be thought of as the ???host portion??? of an IPv6 address. Interface identi?¬?ers are required to be
unique on a speci?¬?c link. Interface identi?¬?ers are always 64 bits and can be dynamically
derived from a Layer 2 media and encapsulation.
There are several ways to assign an IPv6 address to a device:
?– Static assignment using a manual interface ID
2001:0410:0001:/48
2001:0410:0002:/48
IPv6 Internet
2001::/16
Announces
Only the /32 Prefix
Customer
No. 1
Customer
No. 2
2001:0410::/32
Transitioning to IPv6 279
?– Static assignment using an EUI-64 interface ID
?– Stateless autocon?¬?guration
?– DHCP for IPv6 (DHCPv6)
Manual Interface ID Assignment
One way to statically assign an IPv6 address to a device is to manually assign both the
pre?¬?x (network) and interface ID (host) portion of the IPv6 address. To con?¬?gure an IPv6
address on a Cisco router interface and enable IPv6 processing on that interface, use the
ipv6 address ipv6-address/pre?¬?x-length command in interface con?¬?guration mode.
To enable IPv6 processing on the interface and con?¬?gure an address based on the directly
speci?¬?ed bits, you will use the command demonstrated here:
RouterX(config-if) iippvv66 aaddddrreessss 22000011::DDBB88::22222222::77227722::::7722//6644
EUI-64 Interface ID Assignment
Another way to statically assign an IPv6 address is to con?¬?gure the pre?¬?x (network) portion
of the IPv6 address and derive the interface ID (host) portion from the Layer 2 MAC
address of the device, which is known as the EUI-64 interface ID.
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