Table 1-7 Ipv6 Address Compression - Zte ZXR10 5900E Configuration Manual

ZXR10 5900E Series Configuration Guide (IPv6)
numbers and each address contains eight integers. There are totally 128 bits (4 x 4 x 8 =
128). The following are some legal IPv6 addresses:
CDCD: 910A:2222:5498:8475:1111:3900:2020
1030:0:0:0:C9B4:FF12:48AA:1A2B
2000:0:0:0:0:0:0:1
All these integers are hex integers and those from A to F represent 10 to 15. Each integer
of an address must be indicated except for the starting zero. This is a relatively standard
way to express an IPv6 address. Apart from this, there are two more ways that are clearer
and easier to use.
Some IPv6 addresses contain a succession of zeros, similar to the second and the third
examples as mentioned above. In this case, the succession of zeros can be represented
by "pacing", as provided in the relevant standard.
That is to say, the address 2000:0:0:0:0:0:0:1 can be expressed as 2000::1, of which the
two colons mean that the address can be extended to a complete 128-bit address. In this
method, only when the 16-bit group is all-zero, can it be substituted by two colons, which
can only be used once in the address.
Table 1-7

Table 1-7 IPv6 Address Compression

Add Type
Unicast address
Multicast address
Loopback address
Unspecified address
In the environment mixed with IPv4 and IPv6, there may be a third way. The least
significant 32-bit in an IPv6 address can be used to express an IPv4 address in a mixed
way: X:X:X:X:X:X:d.d.d.d, among which X represents a 16-bit and d indicates a 8-bit
decimal integer.
For example, the address 0:0:0:0:0:0:10.0.0.1 is a legal IPv4 address. Therefore, this
address is expressed as: 10.0.0.1 by combining the two possible expressions.
An IPv6 address consists of two parts: subnet prefix and interface identifier. An IP node
address is expected to be expressed in a way similar to that of a CIDR address, as an
address carrying an extra value, indicating how many bits of the address is the mask.
An IPv6 node address indicates the length of a prefix by separating the length from the
IPv6 address with a slash.
For example, in the address of 1030:0:0:0:C9B4:FF12:48AA:1A2B/60, the length of the
prefix for routing is 60-bits
l
IPv6 Host Address
SJ-20150114102049-011|2015-01-15 (R1.0)
shows examples for compressed formats of IPv6 addresses.
Normal Format
1080:0:0:0:8:800:200C:417A
FF01:0:0:0:0:0:0:101
0:0:0:0:0:0:0:1
0:0:0:0:0:0:0:0
1-10
ZTE Proprietary and Confidential
Compressed Format
1080::8:800:200C:417A
FF01::101
::1
::