658 IPv6 Routing Commands
ipv6 address
Use the ipv6 address command in Interface Configuration mode to configure an IPv6 address
on an interface (including tunnel and loopback interfaces) and to enable IPv6 processing on this
interface. Multiple globally reachable addresses can be assigned to an interface by using this
command. There is no need to assign a link-local address by using this command since one is
automatically created. IPv6 addresses can be expressed in eight blocks. Also of note is that
instead of a period, a colon separates each block. For simplification, leading zeros of each 16-bit
block can be omitted. One sequence of 16-bit blocks containing only zeros can be replaced with
a double colon “::”, but not more than one at a time (otherwise it is no longer a unique
representation).
Dropping zeros: 3ffe:ffff:100:f101:0:0:0:1 becomes 3ffe:ffff:100:f101::1
Local host: 0000:0000:0000:0000:0000:0000:0000:0001 becomes ::1
Any host: 0000:0000:0000:0000:0000:0000:0000:0000 becomes ::
The hexadecimal letters in the IPv6 addresses are not case-sensitive. An example of an IPv6
prefix and prefix length is 3ffe:1::1234/64.
Syntax
ipv6 address
prefix/prefix-length
[eui64]
no ipv6 address [
prefix/prefix-length
]
[eui64]
•
prefix
— Consists of the bits of the address to be configured.
•
prefix-length
— Designates how many of the high-order contiguous bits of the address make
up the prefix.
•
eui64
— The optional eui-64 field designates that IPv6 processing on the interfaces is enabled
using an EUI-64 interface ID in the low order 64 bits of the address. If this option is used, the
value of
prefix_length
must be 64 bits.
Default Configuration
This command has no default configuration.
Command Mode
Interface Configuration (VLAN, Tunnel, Loopback) mode.
User Guidelines
This command has no user guidelines.
Example
The following example configures an IPv6 address and enables IPv6 processing.
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