H3C LS-3100-52P-OVS-H3 Operation Manual - page 1114
1-5
MLD query message
An MLD querier learns the multicast listening state of neighbor interfaces by sending MLD query
messages.
Figure 1-3
shows the format of an MLD query message. The dark blue area in the figure
shows the format of an MLDv1 message.
Figure 1-3 Format of MLDv2 query message
Multicast Address (128 bits)
Type = 130
Code
0
7
15
31
Checksum
Maximum Response Delay
Reserved
Reserved
S
QRV
QQIC
Number of Sources (n)
...
3 4
Source Address [1] (128 bits)
Source Address [n] (128 bits)
Table 1-1
describes the fields in
Figure 1-3
.
Table 1-1 Description on fields in an MLDv2 query message
Field
Description
Type = 130
Message type. For a query message, this field is set to 130.
Code
Initialized to zero
Checksum
Standard IPv6 checksum
Maximum Response Delay
Maximum response delay allowed before a host sends a report
message
Reserved
Reserved field and initialized to zero
Multicast Address
z
This field is set to 0 in a general query message.
z
It is set to a specific IPv6 multicast address in a
multicast-address-specific query message or
multicast-address-and-source-specific query message.
S
Flag indicating whether a router updates the timer for suppression
after receiving a query message.
QRV
Querier’s Robustness Variable