Table 7 Multicast Address Format; Table 8 Multicast Scope Value - Zte ZXR10 T600 User Manual

interoperatability, IPv6 reserves 1/128 address space for
OSI NSAP address and network IPX address respectively.
At present, the IPX addresses have not been precisely de-
fined. Refer to RFC 1888 (OSI NSAP and IPv6) for descrip-
tion of the NSAP address allocation.
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Multicast Address
The format of the IPv6 multicast address is different from that
of the IPv6 unicast address. Multicast addresses can only be
used as destination addresses. No packet uses a multicast
address as the source address.
multicast address.
T 7 M
ABLE ULTICAST
4
8
1111111 Flags
The first byte of the address format is set to full-one, identify-
ing 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:
Flags field
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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.
Scope field
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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 values 4–bits
value ranges from 0 to 15.
range.
T 8 M
ABLE ULTICAST
Hex
0
1
2
3
Confidential and Proprietary Information of ZTE CORPORATION
Chapter 2 IPv6 Basic Configuration
Table 7
A F
DDRESS ORMAT
4
112
Sco- Group identifier
pe
Table 8 shows the corresponding
S V
COPE ALUE
Decimal
0
1
2
3
shows the format of a
Value
Reserved
Node-local range
Link-local range
Unallocated
11