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114
9.3.1
IGMP
Snooping
With
the
wider
application
of
multicast,
IGMP
V3
is
used
more
and
more.
It
adds
the
source
multicast
filtering
function,
making
the
receiver
not
only
specify
the
multicast
group
to
join
but
also
specify
to
receive
the
multicast
information
from
certain
multicast
group.
The
configuration
steps
are
as
follows:
Step
1
Specify
the
VLAN
ID
of
a
multicast
group,
the
VLAN
name
can
be
no
changed
here.
Step
2
Enable
or
disable
IGMP
Snooping
on
the
field
of
Statue,
if
enable
it,
select
IGMP
version
2
or
3.
Until
now,
IGMP
has
three
versions:
including
IGMP
Version
1
(defined
by
RFC1112),
IGMP
Version
2
(defined
by
RFC2236),
and
IGMP
Version
3
(defined
by
RFC
3376).
On
this
page,
you
can
enable
IGMP
Snooping
feature
for
a
VLAN
group.
By
default,
the
IGMP
Snooping
feature
is
disabled.
The
bottom
part
of
this
page
lists
all
VLAN
IGMP
Snooping
status.