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4.8.2
IGMP Query
This page allows users to configure
IGMP Query
feature. Since the Managed Switch can
only be configured as the member port of the management VLAN, IGMP Query can only be
enabled on the management VLAN. If you want to run IGMP Snooping feature in several
VLANs, you should notice that whether each VLAN has its own IGMP Querier first.
The IGMP querier periodically sends query packets to all end-stations on the LANs or
VLANs that are connected to it. For networks with more than one IGMP querier, a switch
with the lowest IP address becomes the IGMP querier.
In IGMP Query selection, you can select V1, V2 or Disable.
V1
means IGMP V1 General
Query and
V2
means IGMP V2 General Query.. The query will be forwarded to all multicast
groups in the VLAN.
Disable
allows you to disable IGMP Query.
Query Interval(s)
: The period of query sent by querier.
Query Maximum Response Time
: The span querier detect to confirm there are no more
directly connected group members on a LAN.
Once you finish configuring the settings, click on
Apply
to apply your configuration.
4.8.3
Unknown Multicast
After enabled IGMP Snooping, the known multicast can be filtered by IGMP Snooping
mechanism and forwarded to the member ports of the known multicast groups. The other
multicast streams which are not leant is so-called unknown multicast, the switch decide
how to forward them based on the setting of this page.
Send to Query Ports:
The unknown multicast will be sent to the Query ports. The Query
port means the port received the IGMP Query packets. It is usually the uplink port of the
switch.
Send to All Ports:
The unknown multicast will be flooded to all ports of the same VLAN,
even they are not the IGMP member ports of the groups.
Discard:
The unknown multicast will be discarded. Non-member ports will not receive the
unknown multicast streams.
This page allows you to decide how to forward the unknown multicast traffic.
