358
NE2552E Application Guide for ENOS 8.4
IGMP Snooping
IGMP
Snooping
allows
the
switch
to
forward
multicast
traffic
only
to
those
ports
that
request
it.
IGMP
Snooping
prevents
multicast
traffic
from
being
flooded
to
all
ports.
The
switch
learns
which
server
hosts
are
interested
in
receiving
multicast
traffic,
and
forwards
it
only
to
ports
connected
to
those
servers.
IGMP
Snooping
conserves
bandwidth.
With
IGMP
Snooping,
the
switch
learns
which
ports
are
interested
in
receiving
multicast
data,
and
forwards
multicast
data
only
to
those
ports.
In
this
way,
other
ports
are
not
burdened
with
unwanted
multicast
traffic.
The
switch
can
sense
IGMP
Membership
Reports
from
attached
clients
and
act
as
a
proxy
to
set
up
a
dedicated
path
between
the
requesting
host
and
a
local
IPv4
Multicast
router.
After
the
pathway
is
established,
the
switch
blocks
the
IPv4
Multicast
stream
from
flowing
through
any
port
that
does
not
connect
to
a
host
member,
thus
conserving
bandwidth.
The
client
‐
server
path
is
set
up
as
follows:
An
IPv4
Multicast
Router
(Mrouter)
sends
Membership
Queries
to
the
switch,
which
forwards
them
to
all
ports
in
a
given
VLAN.
Hosts
that
want
to
receive
the
multicast
data
stream
send
Membership
Reports
to
the
switch,
which
sends
a
proxy
Membership
Report
to
the
Mrouter.
The
switch
sets
up
a
path
between
the
Mrouter
and
the
host,
and
blocks
all
other
ports
from
receiving
the
multicast.
Periodically,
the
Mrouter
sends
Membership
Queries
to
ensure
that
the
host
wants
to
continue
receiving
the
multicast.
If
a
host
fails
to
respond
with
a
Membership
Report,
the
Mrouter
stops
sending
the
multicast
to
that
path.
The
host
can
send
an
IGMP
Leave
packet
to
the
switch,
which
responds
with
an
IGMP
Groups
Specific
Query
in
order
to
check
if
there
are
other
clients
that
want
to
receive
the
multicast
traffic
for
the
group
referenced
in
the
Leave
packet.
If
an
IGMP
Report
is
not
received,
the
group
is
deleted
from
the
port
and
the
multicast
path
is
terminated.
The
switch
then
sends
a
Proxy
Leave
packet
to
the
Mrouter
in
order
to
update
it.
If
the
FastLeave
option
is
enabled
on
a
VLAN,
the
multicast
path
is
terminated
immediately
and
the
Leave
packet
is
directly
forwarded
to
the
Mrouter.
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