116
4.11.5
Topology
Discovery
The
switch
supports
topology
discovery
or
LLDP
(IEEE
802.1AB
Link
Layer
Discovery
Protocol)
function
that
can
help
user
to
discovery
multi
‐
vendor’s
network
device
on
same
segment
by
NMS
system
which
supports
LLDP
function;
With
LLDP
function,
NMS
can
easier
maintain
the
topology
map,
display
port
ID,
port
description,
system
description,
VLAN
ID…
Once
the
link
failure,
the
topology
change
events
can
be
updated
to
the
NMS
as
well.
The
LLDP
Port
State
can
display
the
neighbor
ID
and
IP
leant
from
the
connected
devices.
LLDP:
Select
Enable/Disable
to
enable/disable
LLDP
function.
LLDP
Configuration:
To
configure
the
related
timer
of
LLDP.
LLDP
Timer:
the
interval
time
of
each
LLDP
and
counts
in
second;
the
valid
number
is
from
5
to
254,
default
is
30
seconds.
LLDP
Hold
time:
The
TTL
(Time
To
Live)
timer.
The
LLDP
state
will
be
expired
once
the
LLDP
is
not
received
by
the
hold
time.
The
default
is
120
seconds.
Local
port:
the
current
port
number
that
linked
with
neighbor
network
device.
Neighbor
ID:
the
MAC
address
of
neighbor
device
on
the
same
network
segment.
Neighbor
IP:
the
IP
address
of
neighbor
device
on
the
same
network
segment.
Neighbor
VID:
the
VLAN
ID
of
neightbor
device
on
the
same
network
segment.
