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Last Member Quer
y
Times:
Enter the times of sending specific query frames by IGMP
Snooping Querier. At receiving a leave frame, a specific query
frame will be sent by IGMP Snooping Querier. If a report frame is
received before sending specific frames number reaches "Last
Member Query Times", the switch will still treat the port as group
member and stop sending specific query frames to the port,
otherwise the port will be removed from forward-ports of the IP
multicast group.
Last Member Query
Source IP:
Enter the source IP of the specific query frame sent by IGMP
Snooping Querier. It should not be a multicast IP or a broadcast IP.
IGMP Snooping Querier Table
VLAN ID Select: Click the Select button to quick-select the corresponding port
based on the VLAN ID you entered.
Select: Select the desired entry. It is multi-optional.
VLAN ID: Displays the ID of the VLAN that enables IGMP Snooping Querier.
Query Interval: Displays the Query Interval of the IGMP Snooping Querier.
Max Response
Time:
Displays the maximal time for the host to respond to a general
query frame sent by IGMP Snooping Querier.
General Query
Source IP:
Displays the source IP of the general query frame sent by IGMP
Snooping Querier.
Last Member Query
Interval:
Displays the time interval of sending specific query frames by
IGMP Snooping Querier.
Last Member Query
Times:
Displays the times of sending specific query frames by IGMP
Snooping Querier.
Last Member Query
Source IP:
Displays the source IP of the specific query frame sent by IGMP
Snooping Querier.
9.2 MLD Snooping
MLD Snooping
Multicast Listener Discovery（MLD）snooping is applied for efficient distribution of IPv6 multicast
data to clients and routers in a Layer 2 network. With MLD snooping, IPv6 multicast data is
selectively forwarded to a list of ports that want to receive the data, instead of being flooded to all
ports in a VLAN. The list is constructed and maintained by snooping IPv6 multicast control packets.
MLD snooping performs a similar function in IPv6 as IGMP snooping in IPv4.
The switch, running MLD Snooping, listens to the MLD messages transmitted between the host
and the router, and tracks the MLD messages and the registered port. When receiving MLD report
message, the switch adds the port to the multicast address table; when the switch listens to MLD
Done message from the host, the router sends the Multicast-Address-Specific Query message of
the port to check if other hosts need this multicast, if yes, the switch will receive MLD report
message; if no, the switch will receive no response from the hosts and the switch will remove the
port from the multicast address table. The router regularly sends MLD query messages. After
receiving the MLD query messages, the switch will remove the port from the multicast address
table if the switch receives no MLD report message from the host within a period of time.
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