Avaya IPv6 Manual de usuario Pagina 19

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IPv6 Overview
118428-A Rev. A
1-19
Interface ID
The
interface ID
or
token
is a unique number identifying an IPv6 node (a host or a
router). For stateless autoconfiguration (see “Address Autoconfiguration” on page
1-27), this ID is 64 bits long.
In IPv6 stateless autoconfiguration, the interface ID is derived by a formula that
uses the link layer 48-bit MAC address. (In most cases, the interface ID is a 64-bit
token that contains the 48-bit MAC address.) This means that to the extent that the
MAC address is unique, the IPv6 interface ID is unique.
If you configure tokens or MAC addresses (or both) manually, there need be no
relation between the MAC address and the token. A manually configured token
may also be longer or shorter than 64 bits.
Anycast Address
An IPv6
anycast address
is a unicast address identifying a group of IPv6 nodes
that share a common variable-length address prefix. A packet bearing an anycast
address is delivered to one node in the group.
Multicast Address
An IPv6
multicast addres
s identifies a group of nodes. A packet bearing a
multicast address is delivered to all members of the group. (The function of IPv4
broadcast addresses has been superseded by IPv6 multicast addresses.)
F
igure 1-2 shows the format of an IPv6 multicast address.
Figure 1-2. Multicast Address Format
A value of FF (11111111) in the 8 high-order bits of an IPv6 address indicates
that the address specifies a multicast group. The 4-bit
flags
field indicates whether
the group is permanent or transient. The 4 -bit
scope
field indicates the scope of
the group specified in the 112-bit
group ID
field.
11111111
8 bits 4 bits 4 bits
112 bits
IPV0001A
flags scope group ID
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