B
ASIC
M
ANAGEMENT
T
ASKS
4-14
• 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, 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.
- 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.
- Or you can include a general prefix for the network portion of the
address (as described under “Configuring an IPv6 General Network
Prefix” on page 4-22). When using this method, remember that the
prefix length specified on the IPv6 Configuration page must include
both the length of the general prefix and any contiguous bits (from the
left of the specified address) that are added to the general prefix to
form the extended network portion of the address.
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