3Com MSR 50 Series Configuration Manual page 1221

MLD query message
An MLD querier learns the multicast listening state of neighbor interfaces by
sending MLD query messages.
message. The dark blue area in the figure shows the format of an MLDv1
message.
Figure 355 Format of MLDv2 query message
0 3 4 7
Type = 130
Maximum Response Delay
Reserved S QRV
Table 47 describes the fields in
Table 47 Description on fields in an MLDv2 query message
Field
Type = 130
Code
Checksum
Maximum Response Delay
Reserved
Multicast Address
Figure 355 shows the format of an MLD query
15
Code
Multicast Address (128 bits)
QQIC
Source Address [1] (128 bits)
Source Address [n] (128 bits)
Figure 355.
Description
Message type. For a query message, this field is set to
130.
Initialized to zero
Standard IPv6 checksum
Maximum response delay allowed before a host sends a
report message
Reserved field and initialized to zero
This field is set to 0 in a general query message.
■
It is set to a specific IPv6 multicast address in a
■
multicast-address-specific query message or
multicast-address-and-source-specific query message.
MLD Overview
Checksum
Reserved
Number of Sources (n)
1221
31