Table 1-5 Multicast Address Format; Table 1-6 Multicast Scope Value - Zte ZXR10 5900E Configuration Manual

ZXR10 5900E Series Configuration Guide (IPv6)

Table 1-5 Multicast Address Format

8
1111111
The first byte of the address format is set to full-one, identifying it as a multicast
address. The multicast address occupies the entire 1/256 of the IPv6 address space.
The other parts except the first byte of the multicast address format contain the
following three fields:
l
Flags field
This field consists of four single bit flags. Currently, only the bit-4 is designated to
indicate that whether this address is a well-known multicast address designated
by the Internet numbering institution, or a temporary multicast address used in a
specific occasion.
If this flag bit is set to zero, it indicates that this address is a well-known address.
If this flag bit is set to one, it indicates that this address is a temporary address.
The other three flag bits are reserved for future use. The initialization value is 0.
l
Scope field
This is a 4-bit field and is used to indicate the range of multicast. That is, whether
a multicast group only includes nodes within the same local network, the same
site or the same institution, or includes nodes that resides anywhere in the IPv6
global address space. The possible 4-bits value ranges from 0 to 15. For the
corresponding ranges, refer to

Table 1-6 Multicast Scope Value

SJ-20150114102049-011|2015-01-15 (R1.0)
4
Flags
Hex
0
1
2
3
4
5
6
7
8
9
10
11
12
4 112
Scope Group identifier
Table 1-6.
Decimal
0
1
2
3
4
5
6
7
8
9
A
B
C
1-8
Value
Reserved
Node-local range
Link-local range
Unallocated
Unallocated
Site-local range
Unallocated
Unallocated
Institution-local range
Unallocated
Unallocated
Unallocated
Unallocated
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