LevelOne GEL-5261, User Manual

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Chapter 16
| IP Configuration
Setting the Switch’s IP Address (IP Version 6)
Configuring an
IPv6 Address
Use the IP > IPv6 Configuration (Add IPv6 Address) page to configure an IPv6
interface for management access over the network, or for creating an interface to
multiple subnets.
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 IPv6 (see
“Configuring IPv6 Interface Settings” on page 504 ), 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 a
network prefix in the range of FE80~FEBF.
◆
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 504 ).
■
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.