378
Table 10 MLDv2 query message field description
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
•
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.
S
Flag indicating whether a router updates the timer for suppression after
receiving a query message.
QRV
Querier's Robustness Variable.
QQIC
Querier's Query Interval Code.
Number of Sources
•
This field is set to 0 in a general query message or a
multicast-address-specific query message.
•
This field represents the number of source addresses in a
multicast-address-and-source-specific query message.
Source Address( i )
IPv6 multicast source address in a multicast-address-specific query
message. (i = 1, 2, .., n, where n represents the number of multicast
source addresses.)
MLD report message
A host sends an MLD report message to report the current multicast listening state.
shows the MLD report message format.
Figure 110 MLDv2 report message format
