POEGEM24T4SFP
User
Manual
146
The
Fig.
3
‐
146
shows
the
procedure
of
802.1X
authentication.
There
are
steps
for
the
login
based
on
802.1X
port
access
control
management.
The
protocol
used
in
the
right
side
is
EAPOL
and
the
left
side
is
EAP.
1.
At
the
initial
stage,
the
supplicant
A
is
unauthenticated
and
a
port
on
the
switch
is
acting
as
an
authenticator
and
is
in
an
unauthorised
state.
So
access
is
blocked
at
this
stage.
2.
Initiating
a
session.
Either
authenticator
or
supplicant
can
initiate
the
message
exchange.
If
supplicant
initiates
the
process,
it
sends
EAPOL
‐
start
packet
to
the
authenticator
PAE
and
authenticator
will
immediately
respond
EAP
‐
Request/Identity
packet.
3.
The
authenticator
always
periodically
sends
EAP
‐
Request/Identity
to
the
supplicant
for
requesting
the
identity
it
wants
to
be
authenticated.
4.
If
the
authenticator
doesn’t
send
EAP
‐
Request/Identity,
the
supplicant
will
initiate
EAPOL
‐
Start
the
process
by
sending
to
the
authenticator.
5.
Next,
the
Supplicant
replies
an
EAP
‐
Response/Identity
to
the
authenticator.
The
authenticator
will
embed
the
user
ID
into
Radius
‐
Access
‐
Request
command
and
send
it
to
the
authentication
server
for
confirming
its
identity.
6.
After
receiving
the
Radius
‐
Access
‐
Request,
the
authentication
server
sends
Radius
‐
Access
‐
Challenge
to
the
supplicant
asking
them
to
input
their
username
and
password
via
the
authenticator
PAE.
7.
The
supplicant
will
convert
the
username
and
password
into
the
credential
information,
perhaps,
in
MD5
format
and
reply
with
an
EAP
‐
Response
with
this
credential
information
as
well
as
the
specified
authentication
algorithm
(MD5
or
OTP)
to
the
Authentication
server
via
the
authenticator
PAE.
As
per
the
value
of
the
type
field
in
message
PDU,
the
authentication
server
knows
which
algorithm
should
be
applied
to
authenticate
the
credential
information,
EAP
‐
MD5
(Message
Digest
5)
or
EAP
‐
OTP
(One
Time
Password)
or
other
algorithm.
Supplicant A
B
C
Authentication server
Authenticator
Fig.
3
‐
146
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