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15
SNMP
Manager
The
Simple
Network
Management
Protocol
(SNMP)
is
an
Internet
standard
protocol,
widely
used
for
a
network
management
station
(NMS)
to
access
and
operate
the
devices
(SNMP
agents)
on
a
network,
regardless
of
their
vendors,
physical
characteristics
and
interconnect
technologies.
SNMP
enables
network
administrators
to
read
and
set
the
variables
on
managed
devices
to
monitor
their
operating
and
health
state,
diagnose
network
problems,
and
collect
statistics
for
management
purposes.
AE208
Gateway
SNMP
agents
support
three
SNMP
versions:
SNMPv1,
SNMPv2c,
and
SNMPv3.
SNMPv1
uses
Community
Name
authentication
to
control
access
to
SNMP
agents.
SNMPv1
Community
Name
fall
into
read
only
passwords
and
read
and
write
passwords.
A
read
Community
Name
enables
reading
data
from
an
SNMP
agent.
A
read
and
write
Community
Name
enables
reading
data
and
setting
variables
on
an
SNMP
agent.
SNMPv2c
also
uses
Community
Name
authentication
for
SNMP
agent
access
control.
It
is
compatible
with
SNMPv1,
but
supports
more
operation
modes,
data
types,
and
error
codes.
SNMPv3
uses
a
user
‐
based
security
model
(USM)
to
secure
SNMP
communication.
You
can
configure
authentication
and
privacy
mechanisms
to
authenticate
access
and
encrypt
SNMP
Note:
An
NMS
and
an
SNMP
agent
must
use
the
same
SNMP
version
to
communicate
with
each
other.
SNMP
management
frame
includes
three
network
elements:
SNMP
Management
Station,
SNMP
Agent
and
MIB
(Management
Information
Base).
SNMP
Management
Station
:
SNMP
Management
Station
is
the
workstation
for
running
the
SNMP
client
program,
providing
a
friendly
management
interface
for
the
administrator
to
manage
the
most
network
devices
conveniently.
SNMP
Agent
:
Agent
is
the
server
software
operated
on
network
devices
with
the
responsibility
of
receiving
and
processing
the
request
packets
from
SNMP
Management
Station.
In
the
meanwhile,
Agent
will
inform
the
SNMP
Management
Station
of
the
events
whenever
the
device
status
changes
or
the
device
encounters
any
abnormalities
such
as
restarting
the
device.
MIB
:
MIB
is
the
set
of
the
managed
objects.
MIB
defines
a
few
attributes
of
the
managed
objects,
including
the
names,
the
access
rights,
and
the
data
types.
Every
SNMP
Agent
has
its
own
MIB.
The
SNMP
Management
station
can
read/write
the
MIB
objects
basing
on
its
management
right.
SNMP
Management
Station
is
the
manager
of
SNMP
network
while
SNMP
Agent
is
the
managed
object.
The
information
between
SNMP
Management
Station
and
SNMP
Agent
are
exchanged
