H3C S7500E Series Ethernet Switches Operation Manual

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Operation Manual – IPv6 Configuration

H3C S7500E Series Ethernet Switches Chapter 1 IPv6 Basics Configuration

1-5

 Note:

There are no broadcast addresses in IPv6. Their function is superseded by multicast

addresses.

The type of an IPv6 address is designated by the first several bits called format prefix.

Table 1-1 lists the mappings between address types and format prefixes.

Table 1-1 Mapping between address types and format prefixes

Type Format prefix (binary) IPv6 prefix ID

Unassigned

address

00...0 (128 bits) ::/128

Loopback address 00...1 (128 bits) ::1/128

Link-local address 1111111010 FE80::/10

Site-local address 1111111011 FEC0::/10

Unicast

address

Global unicast

address

other forms —

Multicast address 11111111 FF00::/8

Anycast address

Anycast addresses are taken from unicast

address space and are not syntactically

distinguishable from unicast addresses.

III. Unicast address

There are several forms of unicast address assignment in IPv6, including aggregatable

global unicast address, link-local address, and site-local address.

z The aggregatable global unicast address, equivalent to an IPv4 public address, is

provided for network service providers. The type of address allows efficient route

prefix aggregation to restrict the number of global routing entries.

z The link-local address is used for communication between link-local nodes in

neighbor discovery and stateless autoconfiguration. Routers must not forward any

packets with link-local source or destination addresses to other links.

z IPv6 unicast site-local addresses are similar to private IPv4 addresses. Routers

must not forward any packets with site-local source or destination addresses

outside of the site (equivalent to a private network).

z Loopback address: The unicast address 0:0:0:0:0:0:0:1 (represented in the

shortest format as ::1) is called the loopback address and may never be assigned

to any physical interface. Like the loopback address in IPv4, it may be used by a

node to send an IPv6 packet to itself.