HP 6200YL - Manual (Page 54)

IPv6 Addressing
Address Types and Scope
Address Types and Scope
Address Types
IPv6 uses these IP address types:
■ Unicast: Identifies a specific IPv6 interface. Traffic having a unicast
destination address is intended for a single interface. Like IPv4 addresses,
unicast addresses can be assigned to a specific VLAN on the switch and
to other IPv6 devices connected to the switch. At a minimum, a given
interface must have at least a link-local address. To send or receive traffic
off of a VLAN, an interface must also have one or more global unicast
addresses.
■ Multicast: Provides a single destination address for traffic intended for
all members of a group, and provides a means for reducing unnecessary
traffic to interfaces that do not belong to a given multicast group. Member­
ship in a group can be determined by request or by a characteristic, such
as all nodes, all routers, or all routers of a given type. Multicast traffic can
be generated by a single source or multiple sources, but in either case is
intended for multiple destinations.Common types of multicast traffic
include streaming video and audio to multiple receivers who have joined
a specific group from diverse locations.
N o t e Unlike IPv4, broadcast addresses are not used in IPv6. Multicast addresses
are used instead. For more on this topic, refer to “Multicast Application to
IPv6 Addressing” on page 3-19.
A given interface can have only one link-local address, but can have multiple
unicast addresses.
Address Scope
The address scope determines the area (topology) in which a given IPv6
address is used. This section provides an overview of IPv6 address types. For
more information, refer to the chapter titled “IPv6 Addressing”.
Link-Local Address. Limited to a given interface (VLAN). Enabling IPv6 on
a given VLAN automatically generates a link-local address used for switched
traffic on the VLAN.
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