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IPv6 Interface Commands
60-8
60
universal/local bit in the address and inserting the hexadecimal number FFFE
between the upper and lower three bytes of the of the MAC address.
For example, if a device had an EUI-48 address of 28-9F-18-1C-82-35, the
global/local bit must first be inverted to meet EUI-64 requirements (i.e., 1 for
globally defined addresses and 0 for locally defined addresses), changing 28
to 2A. Then the two bytes FFFE are inserted between the OUI (i.e., company
id) and the rest of the address, resulting in a modified EUI-64 interface
identifier of 2A-9F-18-FF-FE-1C-82-35.
• This host addressing method allows the same interface identifier to be used
on multiple IP interfaces of a single device, as long as those interfaces are
attached to different subnets.
Example
This example uses the general network prefix of 2001:0DB8:0:1::/64 used in an
earlier example, and specifies that the EUI-64 interface identifier be used in the
lower 64 bits of the address.
Related Commands
ipv6 address autoconfig (60-6)
show ipv6 interface (60-10)
Console(config)#interface vlan 1
Console(config-if)#ipv6 address 2001:0DB8:0:1::/64 eui-64
Console(config-if)#end
Console#show ipv6 interface
Vlan 1 is up
IPv6 is enable.
Link-local address:
FE80::200:E8FF:FE90:0/64
Global unicast address(es):
2001:DB8::1:200:E8FF:FE90:0, subnet is 2001:DB8:0:1::/64
Joined group address(es):
FF01::1/16
FF02::1/16
FF02::1:FF90:0/104
MTU is 1500 bytes.
ND DAD is enabled, number of DAD attempts: 1.
ND retransmit interval is 1000 milliseconds