ZXR10 T600/T1200 User Manual (IPv6 Volume)
A router that resides outside of an institution but used
by the institution shall not forward these addresses.
It
can neither prevent these addresses from being forwarded,
nor distinguish these addresses from other valid IPv4 ad-
dresses. It is comparatively easier to make configurations
for a router to enable it to forward these addresses.
To realize this function, IPv6 allocates two different address
segments from the globally unique Internet space.
is originated from RFC 2373, indicating the structures of
link-local and site-local addresses.
T
ABLE
6 S
TRUCTURES OF
L
INK
-
LOCAL
A
DDRESS AND
S
ITE
-
LOCAL
A
DDRESS
Link-local Address
10
54
64
1111111010
0
Interface identifier
Site-local Address
10
38
16
64
1111111011
0
Subnet
identifier
Interface identifier
Link-local addresses are used in single network link for host
numbering. The address identified by the first ten bits of
the prefix is the link-local address. Routers do not process
the packets with link-local addresses at their source end
and destination end because they will never forward these
packets.
The middle 54 bits of this address are set to zero, its 64-bit
interface identifier is in the same IEEE structure as men-
tioned in the foregoing paragraphs, and the part of this ad-
dress space allows some networks to connect up to 2
64
-1
hosts.
Link-local addresses are used for the single network link
and site-local addresses are used for sites. It means that
site-local addresses can be used to transmit data in the
interconnected networks but cannot be directly routed to
the global Internet from a site.
Routers within a site can only forward packets within the
site instead of forwarding them outside of the site. The
10-bit prefix of a site-local address is immediately followed
by a succession of zeros, which is slightly different from
that of a link-local address. The subnet identifier of a site-
local address is 16-bit, and its interface identifier is still the
64-bit IEEE-based address.
�
Open Systems Interconnection (
) Network Service Ac-
cess Point (
) Address and Internetwork Packet Ex-
change (
) Address
One of the IPv6 objects is to unify the whole network world
for among networks of IP, IPX and OSI. To support this
10
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Summary of Contents for ZXR10 T1200
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