Edge-Core ECS4810-12M Layer 2, Руководство по управлению

Страница: 509 / 1236

C
HAPTER
16
| IP Configuration
Setting the Switch’s IP Address (IP Version 6)
– 509 –
by a forward slash, and 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).
■
EUI-64 (Extended Universal Identifier) – Configures an IPv6
address for an interface using an EUI-64 interface ID in the low
order 64 bits.
■
When using EUI-64 format for the low-order 64 bits in the host
portion of the address, the value entered in the IPv6 Address
field includes the network portion of the address, and the prefix
length indicates how many contiguous bits (starting at the left)
of the address comprise the prefix (i.e., the network portion of
the address). Note that the value specified in the IPv6 Address
field 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 bits used in the network portion
of the address will take precedence over the interface identifier.
■
IPv6 addresses are 16 bytes long, of which the bottom 8 bytes
typically form a unique host identifier based on the device’s MAC
address. The EUI-64 specification is designed for devices that
use an extended 8-byte MAC address. For devices that still use a
6-byte MAC address (also known as EUI-48 format), it must be
converted into EUI-64 format by inverting the universal/local bit
in the address and inserting the hexadecimal number FFFE
between the upper and lower three bytes of the MAC address.
For example, if a device had an EUI-48 address of 28-9F-18-1C-
82-35, the global/local bit must first be inverted to meet EUI-64
requirements (i.e., 1 for globally defined addresses and 0 for
locally defined addresses), changing 28 to 2A. Then the two
bytes FFFE are inserted between the OUI (i.e., organizationally
unique identifier, or company identifier) and the rest of the
address, resulting in a modified EUI-64 interface identifier of 2A-
9F-18-FF-FE-1C-82-35.
■
This host addressing method allows the same interface identifier
to be used on multiple IP interfaces of a single device, as long as
those interfaces are attached to different subnets.
■
Link Local – Configures an IPv6 link-local address.
■
The address prefix must be FE80.
■
You can configure only one link-local address per interface.
■
The specified address replaces a link-local address that was
automatically generated for the interface.
◆ IPv6 Address – IPv6 address assigned to this interface.