POEGEM24T4SFP
User
Manual
144
3.12.
802.1x
Configuration
802.1X
port
‐
based
network
access
control
provides
a
method
to
restrict
users
to
access
network
resources
via
authenticating
user’s
information.
This
restricts
users
from
gaining
access
to
the
network
resources
through
an
802.1X
‐
enabled
port
without
authentication.
If
a
user
wishes
to
access
the
network
through
a
port
under
802.1X
control,
he
(she)
must
firstly
input
his
(her)
account
name
for
authentication
and
waits
authorisation
before
sending
or
receiving
any
packets
from
an
802.1X
‐
enabled
port.
Before
the
devices
or
end
stations
can
access
the
network
resources
through
the
ports
under
802.1X
control,
the
devices
or
end
stations
connected
to
a
controlled
port
send
the
authentication
request
to
the
authenticator,
the
authenticator
passes
the
request
to
the
authentication
server
to
authenticate
and
verify,
and
the
server
tells
the
authenticator
if
the
request
has
been
granted
access
for
the
ports.
According
to
IEEE802.1X,
there
are
three
components
implemented.
They
are
Authenticator,
Supplicant
and
Authentication
server
shown
in
Fig.
3
‐
144.
Supplicant:
It
is
an
entity
being
authenticated
by
an
authenticator.
It
is
used
to
communicate
with
the
Authenticator
PAE
(Port
Access
Entity)
by
exchanging
the
authentication
message
when
the
Authenticator
PAE
request
to
it.
Authenticator:
An
entity
facilitates
the
authentication
of
the
supplicant
entity.
It
controls
the
state
of
the
port,
authorised
or
unauthorised,
according
to
the
result
of
the
authentication
message
exchanged
between
it
and
a
supplicant
PAE.
The
authenticator
may
request
the
supplicant
to
re
‐
authenticate
itself
at
a
configured
time
period.
Once
re
‐
authenticating
to
the
supplicant
has
commenced,
the
controlled
port
keeps
the
authorised
state
until
re
‐
authentication
fails.
A
port
acting
as
an
authenticator
is
thought
to
be
two
logical
ports,
a
controlled
port
and
an
uncontrolled
port.
A
controlled
port
can
only
pass
the
packets
when
the
authenticator
PAE
is
authorised,
and
otherwise,
an
uncontrolled
port
will
unconditionally
pass
the
packets
with
PAE
group
MAC
address,
which
has
the
value
of
01
‐
80
‐
c2
‐
00
‐
00
‐
03
and
will
not
be
forwarded
by
the
MAC
bridge
at
any
time.
Authentication
server:
A
device
provides
authentication
service,
through
EAP,
to
an
authenticator
by
using
authentication
credentials
supplied
by
the
supplicant
to
determine
if
the
supplicant
is
authorised
to
access
the
network
resource.
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