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FTTx,
RFoG
and
HFC
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24
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114
DA
refers
to
the
destination
MAC
address,
SA
refers
to
the
source
MAC
address,
and
Type
refers
to
the
protocol
type
of
the
packet.
IEEE
802.1Q
protocol
defines
that
a
4
‐
byte
VLAN
tag
is
encapsulated
after
the
destination
MAC
address
and
source
MAC
address
to
show
the
information
about
VLAN.
As
shown
in
the
following
figure
of
Format
of
VLAN
tag,
a
VLAN
tag
contains
four
fields,
including
TPID,
priority,
CFI,
and
VLAN
ID.
TPID
is
a
16
‐
bit
field,
indicating
that
this
data
frame
is
VLAN
‐
tagged.
By
default,
it
is
0x8100
in
AE200
Ethernet
switches.
Priority
is
a
3
‐
bit
field,
referring
to
802.1p
priority.
Refer
to
section
“QoS
&
QoS
profile”
for
details.
CFI
is
a
1
‐
bit
field,
indicating
whether
the
MAC
address
is
encapsulated
in
the
standard
format
in
different
transmission
media.
This
field
is
not
described
in
detail
in
this
chapter.
VLAN
ID
is
a
12
‐
bit
field,
indicating
the
ID
of
the
VLAN
to
which
this
packet
belongs.
It
is
in
the
range
of
0
to
4,095.
Generally,
0
and
4,095
is
not
used,
so
the
field
is
in
the
range
of
1
to
4,094.
VLAN
ID
identifies
the
VLAN
to
which
a
packet
belongs.
When
the
switch
receives
a
packet
carrying
no
VLAN
tag,
it
will
encapsulate
a
VLAN
tag
with
the
default
VLAN
ID
of
the
inbound
port
for
the
packet,
and
the
packet
will
be
assigned
to
the
default
VLAN
of
the
inbound
port
for
transmission.
The
VLAN
group
with
VLAN
identifier
(VID)
of
1
is
a
default
VLAN
group.
Each
port
is
a
member
of
this
group
by
default,
and
its
value
can
be
modified.
On
this
tab
page,
you
can
create
a
new
VLAN
group
with
specific
VID
and
VLAN
group
name.
Up
to
64
VLAN
groups
can
be
created;
each
VLAN
group
can
have
an
ID
number
from
1
to
4094.
The
bottom
part
of
this
page
lists
all
existing
VLAN
groups,
as
well
as
the
information
of
each
VLAN
group.
Users
can
also
modify
or
delete
an
existing
VLAN
group
except
the
default
VLAN
with
VID
1.