100
4.8.2
IGMP
Query
This
page
allows
users
to
configure
IGMP
Query
feature.
Since
the
switch
can
only
be
configured
by
member
ports
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
will
become
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
IGMPQuery.
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
This
page
allows
you
to
decide
how
to
forward
the
unknown
multicast
traffic.
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.
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