IP I
NTERFACE
C
OMMANDS
36-18
ipv6 address eui-64
This command configures an IPv6 address for an interface using an
EUI-64 interface ID in the low order 64 bits and enables IPv6 on the
interface. Use the no form without any arguments to remove all manually
configured IPv6 addresses from the interface. Use the no form with a
specific address to remove it from the interface.
Syntax
ipv6 address ipv6-prefix/prefix-length eui-64
no ipv6 address [ipv6-prefix/prefix-length eui-64]
• ipv6-prefix - The IPv6 network portion of the address assigned to the
interface. The prefix must be formatted according to RFC 2373
“IPv6 Addressing Architecture,” using 8 colon-separated 16-bit
hexadecimal values. One double colon may be used in the address to
indicate the appropriate number of zeros required to fill the
undefined fields.
• prefix-length - A decimal value indicating how many contiguous bits
(from the left) of the address comprise the prefix (i.e., the network
portion of the address).
Default Setting
No IPv6 addresses are defined
Command Mode
Interface Configuration (VLAN)
Command Usage
• If a link local address has not yet been assigned to this interface, this
command will dynamically generate a global unicast address and a
link-local address for this interface. (The link-local address is made
with an address prefix of FE80 and a host portion based the router’s
MAC address in modified EUI-64 format.)
• Note that the value specified in the ipv6-prefix may include some of
the high-order host bits if the specified prefix length is less than 64
bits. If the specified prefix length exceeds 64 bits, then the network
portion of the address will take precedence over the interface
identifier.
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