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114
7
VLAN
Configurations
The
traditional
Ethernet
is
a
broadcast
network,
where
all
hosts
are
in
the
same
broadcast
domain
and
connected
with
each
other
through
hubs
or
switches.
The
hub
is
a
physical
layer
device
without
the
switching
function,
so
it
forwards
the
received
packet
to
all
ports.
The
switch
is
a
link
layer
device
which
can
forward
the
packet
according
to
the
MAC
address
of
the
packet.
However,
when
the
switch
receives
a
broadcast
packet
or
an
unknown
unicast
packet
whose
MAC
address
is
not
included
in
the
MAC
address
table
of
the
switch,
it
will
forward
the
packet
to
all
the
ports
except
the
inbound
port
of
the
packet.
In
this
case,
a
host
in
the
network
receives
a
lot
of
packets
whose
destination
is
not
the
host
itself.
Thus,
plenty
of
bandwidth
resources
are
wasted,
causing
potential
serious
security
problems.
The
traditional
way
to
isolate
broadcast
domains
is
to
use
routers.
However,
routers
are
expensive
and
provide
few
ports,
so
they
cannot
subnet
the
network
particularly.
The
virtual
local
area
network
(VLAN)
technology
is
developed
for
switches
to
control
broadcast
in
LANs.
By
creating
VLANs
in
a
physical
LAN,
you
can
divide
the
LAN
into
multiple
logical
LANs,
each
of
which
has
a
broadcast
domain
of
its
own.
Hosts
in
the
same
VLAN
communicate
with
each
other
as
if
they
are
in
a
LAN.
However,
hosts
in
different
VLANs
cannot
communicate
with
each
other
directly.
7.1
Advanced
VLAN
Mode
Configuration
On
this
page,
you
can
select
“NO
VLAN”
to
disable
VLAN
on
the
device,
“Port
‐
based
VLAN”
or
“802.1Q
VLAN”.
7.2
Port
‐
based
VLAN
Port
‐
based
VLAN
technology
introduces
the
simplest
way
to
classify
VLANs.
You
can
isolate
the
hosts
and
divide
them
into
different
virtual
workgroups
through
assigning
the
ports
on
the
device
connecting
to
hosts
to
different
VLANs.
This
way
is
easy
to
implement
and
manage
and
it
is
applicable
to
hosts
with
relatively
fixed
positions.
The
bottom
part
of
this
page
lists
all
port
‐
based
VLAN
groups
that
have
been
set
up.
As
it
shows,
port
1
and
3
are
within
VLAN
1,
they
can
communicate
with
each
other,
but
they
cannot
communicate
with
other
ports
in
other
VLAN.
