ZXR10 ZSR V2 Configuration Guide (IPv6)
The 112-bit multicast ID field identifies a multicast group within a specified range
permanently or temporarily.
Anycast Address
A multicast address can be shared by many nodes in a sense. All the nodes of the
members of a multicast address expect to receive all the packets sent to this address. A
router connecting to five different local Ethernet networks should forward a copy of these
multicast packets to each network respectively (supposing at least one node of each
network subscribers to this multicast address).
Anycast addresses are similar to multicast addresses. Although the two are in the same
case that an anycast address can be shared by multiple nodes, only one node of an anycast
address expects to receive the packet sent to the anycast address.
Anycast is helpful in providing services, especially those requiring no relationship between
client and server, such as, a domain name server and a time server. A domain name
server is nothing but a name server, which provides the same performance whether it is
located closely or remotely.
Similarly, a closely located time server is preferable in terms of accuracy. Therefore, when
a host sends a request to an anycast address to obtain information, it is the nearest server
associated to this anycast address that shall respond.
Anycast addresses are allocated outside of the normal IPv6 unicast address space.
Anycast addresses cannot be distinguished from unicast addresses in their forms, and
each member of an anycast address should be explicitly configured to identify an anycast
address.
2.1.2 Address Format
An IPv4 address consists of four parts separated by dots, that is, four numbers separated
by dots. The following are some legal IPv4 addresses expressed by decimal integer:
0.5.3.1, 127.0.0.1, 201.199.244.101.
An IPv4 address is expressed as a group of four 2-bit hex integers or four 8-bit binary
integers, of which the latter one is seldom used.
The length of an IPv6 address is four times greater than an IPv4 address, and the
complicacy of expression for an IPv6 address is also four times greater than an IPv4
address. An IPv6 address can be basically expressed as X:X:X:X:X:X:X:X, among which
X is 4-bit hex integers (16-bit). Each number contains four bits, each integer contains four
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
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SJ-20140504150128-018|2014-05-10 (R1.0)
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