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(12)

United

States

Patent

Schlichter

a1.

US008380828B1

8,380,828

Feb.

19,

2013

(10)

Patent

N0.:

(45)

Date

Patent:

(54)

(75)

(73)

(*)

(21)

(22)

(51)

(52)

(58)

(56)

SYSTEM

AND

METHOD

FOR

LOCATING

OFFENDING

NETWORK

DEVICE

AND

MAINTAINING

NETWORK

INTEGRITY

Inventors:

Timothy

Schlichter,

Huntsville,

(US);

David

Perkinson,

Madison,

(US);

Mark

Rudolph,

Madison,

(Us)

Assignee:

Adtran,

Inc.,

Huntsville,

(US)

Notice:

Subject

any

disclaimer,

the

term

this

patent

extended

or adjusted

under

U.S.C.

154(b)

249

days.

Appl.

N0.:

12/691,045

Filed:

Jan.

21,

2010

Int.

Cl.

G06F

15/177

(2006.01)

US.

Cl.

......................................

709/221;

709/224

Field

Classi?cation

................

709/221,

709/224

See

application

?le

for

complete

history.

References

Cited

U.S.

PATENT

DOCUMENTS

6,697,873

2/2004

Yiket

a1.

....................

709/238

7,130,385

10/2006

Moon

...........................

379/45

NEIWORK

11.1.

NEIWORK

11111111111

11111111111111011

2005/0232164

10/2005

Anzarouth

a1.

.........

370/255

2006/0174342

A1*

8/2006

Zaheer

a1.

. . . . . . . . .

726/23

2006/0212932

A1*

9/2006

Patrick

a1.

. . . . . . . . .

726/11

2007/0255832

11/2007

Riesberg

a1.

.....

709/226

2008/0080415

4/2008

Stephenson

a1.

........

370/328

2009/0113043

A1*

4/2009

SuiZo

a1.

.................

709/224

2009/0172151

A1*

7/2009

Davis

...........

709/224

2010/0085971

A1*

4/2010

Schunemann

..............

370/392

cited

examiner

Primary

Examiner

Jason

Recek

(74)

Attorney,

Agent,

Firm

Allen,

Dyer,

Doppelt,

Milbrath

Gilchrist,

P.A.

(57)

ABSTRACT

system

and

method

detects

within

network

offend

ing

network

device

that

has

been

adversely

affecting

the

network

performance.

discovery

protocol

frame

propa

gated

successive

network

switches

and

formed

?eld

having

query

for

inquiring

within

each

network

switch

which

the

frame

propagated

whether

the

network

switch

has

database

entry

regarding

the

MAC

address

and

switch

port

for

the

offending

network

device

locate

the

offending

network

device.

This

discovery

protocol

frame

includes

command

for

any

network

switch

that

has

the

offending

net

work

device

connected

thereto

disable the

switch

port

which

the

offending

network

device

connected

block

all

data

tra?ic

from

the

MAC

address

the

offending

network

device.

1.1.

1.1

Claims,

Drawing

Sheets

1112.

NE.

N.E.

4113

‘3

NEIWORKELEMENT

‘320

SWITCH

’

111m

112"

N-E-

—16

‘l8

CL»

‘Q4

0111111111111511

s1111£11>1111111ss

1.1.1.1

22-’

TRAN.

1110c

f‘m

11.11.

#42:

1 2 3 4 5 6 ... 12 13

Summary of Contents

Page 1 - 11111111111

(12) United States Patent Schlichter et a1. US008380828B1 US 8,380,828 B1 Feb. 19, 2013 (10) Patent N0.: (45) Date of Patent: (54) (75) (73) (*) (21)

Page 2 - 542E522

US 8,380,828 B1 7 pared to hunting the offending network device by manually logging onto each network switch and working through the network sequentia

Page 3 - £"J6h?6‘??32?iii

US 8,380,828 B1 9 is about nine bits. The OUI is about three octets and the organiZationally-de?ned subtype is about one octet. The organiZationally-d

Page 4 - EIHERTYPE

US 8,380,828 B1 11 is also possible for the communications server to ring a series of stations and one external phone number. A communica tions server

Page 5

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 sWitc

Page 6

US. Patent Feb. 19, 2013 Sheet 1 015 US 8,380,828 B1 921k .2 l\ a: umlk .22 a 2.: 222:5 2 “522% Am 24 .2 2% 52E :25 A“ i / 1i i 2% .WJW / 542E522 \ E5

Page 7

US. Patent Feb. 19, 2013 Sheet 2 of5 US 8,380,828 B1 50 ( START )’ 52 GENERATE J DISCOVERY PROTOCOL FRAME PROPAGATE J FRAME THROUGH NEIWORK IF OFFENDI

Page 8

US. Patent Feb. 19, 2013 Sheet 3 of5 US 8,380,828 B1 100 102 104 [mp ,/ } DA SA] EIHERTYPE r110 unmummsr MAC 8m LlDPDU H5 ADDRESS ADDRESS nmnmnme H

Page 9

US. Patent LLDP ORGANIZATIONALLY-SPECIFIC TLV Feb. 19, 2013 Sheet 4 0f 5 US 8,380,828 B1 THIS TLV IS DEFINED SO THAT AN ORGANIZATION CAN EXTEND LLDP T

Page 10 - 8,380,828

US. Patent Feb. 19, 2013 Sheet 5 015 US 8,380,828 B1 E; E mk- “L8 J a 5.x 1 Egg; . \ E32 \ / 552 m. 1.. a E;

Page 11

US 8,380,828 B1 1 SYSTEM AND METHOD FOR LOCATING OFFENDING NETWORK DEVICE AND MAINTAINING NETWORK INTEGRITY FIELD OF THE INVENTION This invention rela

Page 12

US 8,380,828 B1 3 FIGS. 3A through 3C show respectively a Link Layer Discovery Protocol (LLDP) frame format, an LLDPU frame format and TLV format that

Page 13

US 8,380,828 B1 5 throughout the network (block 54). A determination is made that if the offending device is found in the sWitch’s database, Was it fo