US
8,380,828
B1
13
17.
The
method
according
to
claim
11,
and
further
com
prising
propagating
the
discovery
protocol
frame
by
the
com
mand
on
the
sWitch.
18.
A
communications
system,
comprising:
a
plurality
of
netWork
sWitches
interconnected
together
and con?gured
to
form
an
Internet
protocol
(IP)
com
munications
network;
an
administrator
connected
to
one
of
said
sWitches
and
con?gured
to
determine
that
one
of
the
sWitches
has
an
offending
netWork
device
connected
thereto
that
has
been
adversely
affecting
netWork
performance
and
input
a
command
on
a
netWork
sWitch
and
propagate
to
suc
cessive
netWork
sWitches
Within
the
IP
netWork
a
dis
covery
protocol
frame
that
comprises
a
?eld
having
a
query
for
inquiring
Within
each
netWork
sWitch
to
Which
the
frame
is
propagated
Whether
the
netWork
sWitch
has
a
database
entry
regarding
a
Media
Access
Control
(MAC)
address
and
sWitch
port
for
the
offending
net
Work
device
to
locate
the
offending
device,
said
discov
ery
protocol
frame
further
comprising
a
command
as
a
user
de?ned
?eld
for
a
netWork
sWitch
that
has
the
offending
netWork
device
connected
thereto
to
con?g
ure
itself
to
disable
its
sWitchport
to
Which
the
offending
netWork
device
is
connected
and
block
all
data
tra?ic
from
the
MAC
address
of
the
offending
netWork
device;
and
in
response
to
When
an
offending
netWork
device
location
has
been
located,
said
netWork
sWitch
to
Which
the
offending
device
is
connected
con?gures
itself
in
response
to
the
command
as
a
user
de?ned
?eld
to
dis
able
its
sWitch
port
to
Which
the
offending
netWork
device
is
connected
and
block
all
data
traf?c
from
the
MAC
address
of
the
offending
netWork
device.
15
20
25
30
14
19.
The
communications
system
according
to
claim
18,
Wherein
said
discovery
protocol
frame
comprises
an
organi
Zationally-speci?c
type
length
value
and
OrganiZationally
Unique
Identi?er
(OUI)
and
de?ned
information
string
to
de?ne
a
MAC
address
for
the
offending
netWork
device
and
de?ne
said
query.
20.
The
system
according
to
claim
18,
Wherein
the
discov
ery
protocol
comprises
a
one-Way
neighbor
discovery
proto
col.
21.
The
system
according
to
claim
20,
Wherein
the
one-Way
neighbor
discovery
protocol
comprises
Link
Layer
Discovery
Protocol
(LLDP).
22.
The
system
according
to
claim
21,
and
Wherein
if
a
netWork
sWitch has
an
entry
and
the
MAC
address
Was
learned
on
a
sWitch
port
Where
there
is
not
an
LLDP
neigh
boring
sWitch,
the location
of
the
offending
netWork
device
has
been
determined.
23.
The
system
according
to
claim
18,
and
further
compris
ing
at
each
netWork
sWitch
a
Management
Information
Base
(MIB)
that
is
accessed
via a
Simple
Network
Management
Protocol
(SNMP).
24.
The
system
according
to
claim
18,
Wherein
said
query
of
said
discovery
protocol
frame
comprises
a
user
de?ned
?eld
as
a
command
that
indicates
information
should
be
given
by
a
netWork
sWitch
concerning
any
knoWledge
about
stored
MAC
addresses.
25.
The
system
according
to
claim
18,
Wherein
said
net
Work
sWitches
comprise
Ethernet sWitches
or
routers.
26.
The
system
according
to
claim
18,
Wherein
said
net
Work
sWitches
comprise
at
least
one
local
area
netWork
(LAN)
access
points.
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