C
HAPTER
16
| IP Configuration
Setting the Switch’s IP Address (IP Version 6)
– 420 –
CONFIGURING AN IPV6
ADDRESS
Use the IP > IPv6 Configuration (Add IPv6 Address) page to configure an
IPv6 interface for management access over the network.
CLI REFERENCES
◆ "IPv6 Interface" on page 925
COMMAND USAGE
◆ All IPv6 addresses 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.
◆ The switch must always be configured with a link-local address.
Therefore any configuration process that enables IPv6 functionality, or
assigns a global unicast address to the switch, including address auto-
configuration or explicitly enabling IPv6 (see "Configuring IPv6
Interface Settings" on page 417), will also automatically generate a
link-local unicast address. The prefix length for a link-local address is
fixed at 64 bits, and the host portion of the default address is based on
the modified EUI-64 (Extended Universal Identifier) form of the
interface identifier (i.e., the physical MAC address). Alternatively, you
can manually configure the link-local address by entering the full
address with the network prefix FE80.
◆ To connect to a larger network with multiple subnets, you must
configure a global unicast address. There are several alternatives to
configuring this address type:
■
The global unicast address can be automatically configured by
taking the network prefix from router advertisements observed on
the local interface, and using the modified EUI-64 form of the
interface identifier to automatically create the host portion of the
address (see "Configuring IPv6 Interface Settings" on page 417).
■
It can be manually configured by specifying the entire network
prefix and prefix length, and using the EUI-64 form of the interface
identifier to automatically create the low-order 64 bits in the host
portion of the address.
■
You can also manually configure the global unicast address by
entering the full address and prefix length.
◆ You can configure multiple IPv6 global unicast addresses per interface,
but only one link-local address per interface.
◆ If a duplicate link-local address is detected on the local segment, this
interface is disabled and a warning message displayed on the console.
If a duplicate global unicast address is detected on the network, the
address is disabled on this interface and a warning message displayed
on the console.
◆ When an explicit address is assigned to an interface, IPv6 is
automatically enabled, and cannot be disabled until all assigned
addresses have been removed.
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