bao cao TT - Bùi Tùng Anh

7/28/2019 bao cao TT - Bi Tng Anh

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BO CO THC TP

Tn ti: Mng th MAN-E v m hnh trin khai ti VNPT


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LI NI U

Trong nhng nm gn y, s pht trin v kinh t, x hi, v vn ha, nht l

xu hng ton cu ha dn n nhu cu trao i thng tin rt ln, a dng v cc

loi hnh dch v v tc . S bng n ca cc t hp vn phng, khu th, cc

khu cng nghip, cc khu cng ngh cao,..thm vo l d n chnh phin t,

sgia tng ca cc mng ni bc quan, cng ty lm cho nhu cu trao i d liu,

thng tin tng t bin. Yu cu vbng thng kt ni ti cc thit b truy nhp

(IPDSLAM, MSAN) ngy cng cao, yu cu vc sh tng truyn ti phi p

ng cc cng ngh mi ca IP sn sng cho cc dch v mi ngy cng tng:

multicast, end-to-end QoS, bandwitdh-on-demand, yu cu p ng bng thng

cung cp trc tip theo nhu cu ca khch hng - khch hng (FE,GE) v cc yucu khc

Song song vi s pht trin ca nhu cu trn, cc cng ngh truy nhp bng

rng (xDSL, FTTx), v cc dch v mi (VoIP, IPTV, VoD,..) cng pht trin

nhanh chng. c bit l nng cp ln NGN ca cc mng vin thng. iu ny

dn n s bng n ca mng MAN trong cc thnh ph, c bit l mng Ethernet-

based MAN truyn ti lu lng IP.

S dng cng ngh MAN-E cung cp dch v cht lng cao, dch v a

dng n khch hng ca cc nh cung cp dch vang l xu hng chung trn

ton th gii. Cng nghEthernet c hu ht cc nh cng cp thit b trn th

gii h trTi Vit Nam cng ngh mng MAN-E c mt s nh cung cp

dch v vin thng trin khai v a vo khai thc thnh cng. Tiu biu l mng

MAN-E ca Tp on Bu chnh Vin thng Vit Nam VNPT, Tp on VNPT

pht trin mng MAN-E da vo cc c im nh sau:Hiu qu chi ph: Chi ph u t v vn hnh thp.

n gin: c tiu chun ha v khng ngng c pht trin. c

ngdng rng ri trong tt c cc t chc, doanh nghip v thit bgia nh.


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linh ng cao: Qun l bng thng v m rng bng thng kt ni rt d

dng. H tr rt nhiu m hnh kt ni (topology) khc nhau. Ti u cho vic

truyn ti thng tin dng gi, c bit l cc gi tin IP.

Mng MAN-E l mng mi nn c rt nhiu vn nghin cu. Vi mongmun c thm kin thc v mng MAN-E v c trc tip tm hiu m hnh trin

khai ti VNPT, em chn ti Mng th MAN-E v m hnh trin khai ti

VNPTlm ti nghin cu thc tp ca mnh.

Bn bo co bao gm 3 chng:

Chng I : Gii thiu tng quan v mng MAN-E, nh nh ngha, m hnh

phn lp, v cc khi nim c bn.Chng II : Trnh by v cc dch v trn mng MAN-E cng nh u, nhc

im v thuc tnh ca tng loi hnh dch v.

Chng III : M hnh trin khai mng MAN-E v cch thc qun l, iu khin

mng ca VNPT.

Trong qu trnh thc tp, em nhn c nhiu kin ng gp, gip qu

bu ca thy Nguyn c Thy.Xin gi li cm n ti cc anh, ch ti Vin KHKT Bu in to iu kin,

gip em trong sut thi gian thc tp.

Do thi gian v hiu bit cn hn ch, ti khng th trnh khi thiu st, knh

mong nhn c nhng kin ng gp ca cc thy gio, c gio v cc bn.

Em xin chn thnh cm n!


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Mc lc

LI NI U .............................................................................................................................................. 2

DANH MC HNH V................................................................................................................................ 6

THUT NG VIT TT ............................................................................................................................ 7

I. TNG QUAN V CNG NGH MNG MAN-E ............................................................................. 9

1. Tng quan mng quang Ethernet ...................................................................................................... 9

2. Cc tnh nng ca MAN-E.............................................................................................................. 10

3. Cu trc mng MAN-E ................................................................................................................... 11

4. M hnh phn lp mng MAN-E .................................................................................................... 11

5. Cc im tham chiu trong mng MAN-E ..................................................................................... 136. Cc thnh phn vt l trong mng MAN-E .................................................................................... 14

7. Li ch dng dch v Ethernet......................................................................................................... 15

II. CC DCH V CUNG CP QUA MNG MAN-E ......................................................................... 16

1. M hnh dch v Ethernet................................................................................................................ 16

2. Knh kt ni o Ethernet (EVC: Ethernet Virtual Connection)...................................................... 17

3. Cc loi dch v trong MAN-E ....................................................................................................... 19

3.1. Khun khnh ngha dch v Ethernet (EthernetDefinition Framework)............................. 19

3.2. Dch v E-Line ........................................................................................................................ 20

3.3. Dch v E-LAN....................................................................................................................... 21

3.4. Dch v E-Tree........................................................................................................................ 22

4. Cc thuc tnh dch v Ethernet ...................................................................................................... 23

4.1. Thuc tnh ghp knh dch v................................................................................................. 23

4.2. Thuc tnh giao din vt l Ethernet ....................................................................................... 24

4.3. Cc thuc tnh vlu lng .................................................................................................... 24

4.4. Cc thuc tnh v hiu nng .................................................................................................... 254.5. Thuc tnh lp dch v (Class of Service Indentifier Service Attribute) ................................ 27

4.6. Thuc tnh truyn khung dch v (Service Frame Delivery Attribute) ................................... 27

4.7. Thuc tnh h trVLAN Tag (VLAN Tag Support Attribute) .............................................. 28

4.8. Thuc tnh v gp nhm (Bundling Attribute) ....................................................................... 30

4.9. Thuc tnh bo mt (Security Fillters Attribute) ..................................................................... 30


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III. M HNH TRIN KHAI MNG MAN-E TI VNPT ................................................................. 30

1. KIN TRC MNG ...................................................................................................................... 30

2. MNG MAN-E DA TRN CNG NGH MPLS ..................................................................... 31

2.1. Thit klu lng MPLS ....................................................................................................... 33

2.2. Phc hi ng hm ............................................................................................................... 34

2.3. H trcht lng dch v trong MPLS .................................................................................. 36

3. PHNG N KT NI, QUN L ............................................................................................ 38

3.1. Phng n kt ni ................................................................................................................... 38

3.2. Phng n qun l mng......................................................................................................... 39

4. H THNG QUN L IU KHIN MNG MAN-E .............................................................. 39

4.1. Qun l topo mng .................................................................................................................. 40

4.2. Qun l ti nguyn .................................................................................................................. 404.3. Qun l li............................................................................................................................... 40

4.4. Qun lhiunng .................................................................................................................... 41

4.5. Qun l bo mt ...................................................................................................................... 41

4.6. Qun l cu hnh ..................................................................................................................... 41

4.7. Cu hnh dch v qua giao din ho ................................................................................... 41

4.8. Cu hnh trn thit b mng (cc router NE40E)..................................................................... 41

KT LUN................................................................................................................................................. 42

TI LIU THAM KHO .......................................................................................................................... 43


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DANH MC HNH V

Hnh 1.1 Cu trc mng MAN-E in hnh ........................................................................................... 11

Hnh 1.2 M hnh mng MAN-Etheo cc lp ....................................................................................... 12

Hnh 1.3 M hnh cc im tham chiu ................................................................................................. 13

Hnh 1.4 Giao din UNI v m hnh tham chiu MAN-E ..................................................................... 14

Hnh 2.1 M hnh cung cp cc dch v Ethernet qua mng MAN-E .................................................. 17

Hnh 2.2 EVC imim .................................................................................................................. 18

Hnh 2.3 EVC ima im .............................................................................................................. 18

Hnh 2.4 EVC dng cy ........................................................................................................................ 19

Hnh 2.5 Khun khnh ngha dch v Ethernet ................................................................................ 20

Hnh 2.6 Dch v E-Line ...................................................................................................................... 20

Hnh 2.7 Dch v E-LAN ...................................................................................................................... 21

Hnh 2.8 Qu trnh thc hin khi thm mt UNI vo mng MAN-E .................................................... 22

Hnh 2.9 Dch v E-Tree ...................................................................................................................... 22

Hnh 2.10 Dch v E-Tree nhiu gc ..................................................................................................... 23

Hnh 2.11 Ghp knh dch v ............................................................................................................... 24

Hnh 2.12 VLAN tag Preservation/Stacking ........................................................................................ 29

Hnh 2.13 VLAN tag Translation/Swapping ........................................................................................ 30Hnh 3.1 Cu trc phn lp mng MAN-E ............................................................................................ 31

Hnh 3.2 Chn header trong MPLS ....................................................................................................... 32

Hnh 3.3 Gi tin gn nhn MPLS .......................................................................................................... 32

Hnh 3.4 Lung gi tin/nhn khi thc hin FRR cho bov tuyn kt ni ........................................... 35

Hnh 3.5 Lung gi tin/nhn khi thc hin FRR cho bao v nt ........................................................... 36

Hnh 3.6 M hnh kt ni mng MAN-E vi mng ng trc ............................................................ 38

Hnh 3.7 Topo mng MAN-E ................................................................................................................ 40


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THUT NG VIT TT

Vit tt Ting Anh Ting Vit

ATM Asynchronous Transfer Mode Ch chuyn mch khngng b

CE Customer Edge Pha khch hngCoS Class of Service Lp dch vDoS Data over SDH D liu trn SDHDSLAM Digital subscriber line ng thu bao sE-LAN Ethernet LAN Service Dch v LAN ethernet

ELS Ethernet Line Service Dch vng kt ni Ethernet

EoS Ethernet over SDH Ethernet trn SDHERS Ethernet Relay Service Dch v chuyn tip EthernetGE Gigabit Ethenet Gigabit Ethenet

GFR Generic Framing Procedure Th tc ng khung tng qut

GMPLSGeneralized Multiprotocol LabelSwitching

Chuyn mch nhn a giao thctng qut

IETF Internet Engineering Task ForceT chc c nhim k thutInternet

IP Internet Protocol Giao thc internet

ISP Internet Service Provider Nh cung cp dch v internet

ITU-T

InternationalTelecommunications Union(TelecommunicationsStandardisation Sector)

Hip hi vin thng quc t

LAN Local area network Mng ni bLSP Label-Switched Path ng chuyn mch nhn

MAC Medium Access Control iu khin truy nhp mi trng

MAN Metro Area Network Mng vng th

MPLS MultiProtocol Label Switching Chuyn mch nhn a giao thc

NGN Next Generation network Mng th h sau


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OTN Optical Transport Network Mng truyn ti quang

OAM Object access method Phng php truy cp i tng

PDH Plesiochronous Digital Hierarchy Phn cp s cn ng b

PPP Point to Point Protocol Giao thc im-ti-im

PSTNPublic Switched Telephone

NetworkMng in thoi cng cng

QoS Quality of Service Cht lng dch v

RSVP Resource Reservation Protocol Giao thc dnh trc ti nguyn

RPR Resilient Packet Ring Vng ring gi phc hi nhanh

SDH Synchronous Digital Hierarchy H thng phn cp sng b

SLA Service Level Agreement Tho thun mc dch vSONET Synchronous Optical Network Mng quang ng b

STM-nSynchronous Transport Modulelevel N

M-dun truyn ti ng b mcn

TCP Transmission Control Protocol Giao thc iu khin truyn ti

TDM Time division multiplexing Ghp knh theo thi gian

UNI User-to-Network InterfaceGiao din kt ni ngi s dng

mngVCC Virtual Channel Connection Knh kt ni oVLAN Virtual LAN LAN oVPN Virtual Private Network Mng ring oWAN Wide area network Mng din rng

WDM Wavelength Division Multiplex Ghp knh theo bc sng


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I.TNG QUAN V CNG NGH MNG MAN-E1. Tng quan mng quang EthernetTrong vi thp k gn y, Ethernet l cng ngh ch yu trong cc mng ni b

LAN, l cng ngh cho trong hu ht cc vn phng trn ton th gii v hin

nay c dng ngay c trong cc hgia nh chia scc ng dy truy nhpbng rng gia cc thit b vi nhau. c bit tt ccc my tnh c nhn u ckt ni bng Ehernet v ngy cng nhiu thit b truy nhp dng n cng ngh ny.C nhiu l do gii thch ti sao Ethernet c sthnh cng nh vy trong ccc doanh nghip ln cc hgia nh: d s dng, tc cao v gi thit b r.

Cng vi s pht trin ca cng ngh thng tin, tc Ethernet c cithin t Mbps ln Gbps v 40Gbps. Song song vi n l s bng n ca Internetyu cu bng thng truyn ti lu lng rt ln, phng tin truyn trong mngEthernet cng chuyn dn t cp ng sang cp quang, v cu hnh cng phttrin t cu trc bus dng chung ln cu trc mng chuyn mch. y l nhng

nhn t quan trng xy dng cc mng c dung lng cao, cht lng cao, vhiu xut cao, p ng c nhng i hi ngy cng kht khe ca yu cu v chtlng dch v (Qos) trong mi trng mng mng th (MAN-E) hay WAN m

bo kt ni vi khch hng mi lc, mi ni mi giao din.

Mrng t mng LAN ra mng MAN-E to ra cc c hi mi cho cc nh khaithc mng. Khi u tvo mng MAN-E, cc nh khai thc c khnng cungcp cc gii php truy nhp tc cao vichi ph tng i thp cho cc im cungcp dch v POP (Points Of Presence) ca h, do loi bc cc im nt cchai tn ti gia cc mng LAN ti cc c quan vi mng ng trc tc cao.

Doanh thu gim do cung cpbng thng vi gi thp hncho khch hng c thb li bng cch cung cp thm cc dch v mi. Do vy MAN-E s to ra phngthc chuyn t cung cp cc ng truyn c gi cao n vic cung cp cc dchv gi trgia tng qua bng thng tng i thp.

Xu hng pht trin cng ngh mng MAN-E:

Hin ti, cc cng ngh tim nngc nhn nh l ng c xy dng mngMAN-E th h mi ch yu tp trung vo 5 loi cng nghchnh, l:

Next Generation SDH/SONET: SDH/SONET th h mi. WDM (Wavelength Division Multiplexing): Ghp knh theo bc song

RPR ( Resilient Packet Ring): vng Ring gi t phc hi. Ethernet/Giagabit Ethernet(GE) Chuyn mch kt ni MPLSCc cng nghni trn ny c xy dng khc nhau c phm vi v cc phng

thc m chng sc s dng. Trong mt strng hp, cc nh cung cp c sh tng li trin khai cng mt cng ngh cho cc ng dng khc nhau. V d, Gbps


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c thc s dng cung cp nng lc truyn ti c shoc cung cp ccdch v gi Ethernettrc tip n khch hng.

Cc nh khai thc mng c xu hng kt hp mt s loi cng ngh trn cngmt mng ca h, v tt c cc cng ngh sng gp vo vic t c nhng mcch chung l:

Gim chi ph u t xy dng mng. Rt ngn thi gian p ng dch v cho khch hng. Dphng dung lng i vi sgia tng lu lng dng gi. Tng li nhun t vic trin khai cc dch v mi. Nng cao hiu sut khai thc mng.Trong khun kh cho php, em xin c trnh by nghin cu ca mnh v

mng MAN trn cng ngh Ethernet/Giagabit Ethernet(GE).

2. Cc tnh nng ca MAN-EKhch hng c kt ni n MAN-E s dng cc giao din thch hp viEthernet thay v phi qua nhiu giai on bin i tlu lng ATM, SONET/SDH

v ngc li. Bng cch ny khng ch loi bc s phc tp m cn lm choqu trnh cung cp n gin i rt nhiu. M hnh Metro hnh thnh t qa trnhcung cp cc ng bng thng (tunel gia cc node v khch hng u cui cungcp cc mng LAN o (VLAN) v cc mng ring o (VPN) da trn mc thothun dch v SLA).

Trong trng hp ny, cc vn c n gin ho i rt nhiu cho ckhch hng ln nh khai thc. Khch hng khng cn phi chia ct lu lng vnh tuyn chng n cc ng ph hp n ng cc node ch na. Thay v

to ra rt nhiu chm ng truyn gia cc node, y ch cn to ra bng thngda theo SLA m bao hm c nhu cu ca khch hng ti mi node.

Ni cch khc, cung cp cc kt ni khng cn l vn thit yu i vi nhcung cp mng na do hc iu kin tp trung vo vic to ra cc dch vgi trgia tng. Bng vic mrng mng LAN vo mng MAN-E s dng kt nic bng thng ln hn, s khng cn s khc bit gia cc server ca mng vi ccrouter c t ti thit b ca khch hng v ti cc im POP ca nh cung cpmng na MAN-E c chc nng thu gom lu lng v p ng nhu cu truyn tilu lng cho cc thit b truy nhp (IPDSLAM, MSAN). C khnng cung cpcc kt ni Ethernet FE/GE) ti khch hng truyn ti lu lng trong ni tnh,

ng thi kt ni ln mng ng trc IP/MPLS NGN chuyn lu lng i lintnh, quc t. Trong mng MAN-E ngi ta s dng cc thit b CES (CarrierEthernetSwitch) ti cc nic lu lng cao to thnh mng chuyn ti Ethernet/IP.Kt ni gia cc thit b CES dng hnh sao, ring hoc u ni tip, s dng ccloi cng kt ni: n x 1Gbps hoc n x 10Gbps.


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3. Cu trc mng MAN-EKin trc mng Metro da trn cng ngh Ethernet in hnh c th m tnh

hnh 1.1. Phn mng truy nhp Metro tp hp lu lng t cc khu vc (c quan,to nh, ...) trong khu vc ca mng Metro. M hnh in hnh thng c xydng xung quanh cc vng Ring quang vi mi vng Ring truy nhp Metro gm t5 n 10 node. Nhng vng Ring ny MAN-E lu lng t cc khch hng khcnhau n cc im POP m cc im ny c kt ni vi nhau bng mng liMetro. Mt mng li Metro in hnh s bao phc nhiu thnh ph hoc mtkhu vc tp trung nhiu doanh nghip.

Hnh 1.1: Cu trc mng MAN-E in hnh

Mt kha cnh quan trng ca nhng mng li Metro ny l cc trung tm dliu, thng c t node quan trng ca mng li Metro c th truy nhp ddng. Nhng trung tm d liu ny phc v ch yu cho ni dung cc host gn

ngi s dng. y cng chnh l ni m cc dch v t nh cung cp dch v khc(Outsourced services) c cung cp cho cc khch hng ca mng MAN-E. Qutrnh truy nhp n ng trc Internet c cung cp ti mt hoc mt simPOP cu thnh nn mng li Metro.

Vic sp xp ny c nhiu u im phlin quan n qu trnh thng mi int. Hin ti c s h tng cho mc ch phi hp thng mi in t cng gnging nh li ca mng Internet, c nhiu phin giao dch hnc xl v sau gim dn, y l hai u im ni tri khi t chc mt giao dch thnh cng da trns thc hin ca Internet.

4. M hnh phn lp mng MAN-EM hnh phn lp mng MAN-E c nh ngha theo MEF 4 c chia lm 3

lp bao gm:

o Lp truyn ti dch v (TRAN layer): bao gm mt hoc nhiu dch vtruyn ti.

o Lp dch v Ethernet (ETH layer): h trcc dch v thng tin d liuEthernet lp 2 (trong mo hnh OSI).


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o Lp dch v ng dng: h trcc ng dng c truyn ti da trndch v Ethernet lp 2.

M hnh phn lp mng MAN-Eda trn quan hClient/Server. Hn na, milp c th bao gm cc thnh phn thuc mt phng qun l, gim st dch v. Mhnh phn lp mng MAN-E c m t ti hnh 1.2.

Hnh 1.2:M hnh mng M AN-Etheo cc lpo Lp truyn ti dch v(Transport Services Layer)

Lp truyn ti dch v, cung cp cc kt ni gia cc phn t ca lp dch vEthernet. S dng nhiu cng nghkhc nhau thc hin vic h trkt ni:IEEE802.1, SONET/SDH, ATM VC, OTN ODUK, PDH DS1/E1, MPLS LSP Cccng ngh truyn ti trn, n lt mnh li c th do nhiu cng ngh khc h tr,c tip tc nh vy cho n lp vt l nh cp quang, cp ng, khng dy.

o Lp dch v Ethernet (EthernetServices Layer)Lp dch v Ethernet c chc nng truyn ti cc dch vhng kt ni chuyn

mch da trn a ch MAC v cc bn tin Ethernet sc truyn trn h thngthng qua cc giao din hng ni b, hng bn ngoi c quy nh r rng,gn vi cc im tham chiu.

Lp ETH cng phi cung cp c cc khnng v OAM, khnng pht trindch v trong vic qun l cc dch v Ethernet hng kt ni. Ti cc giao dinhng bn ngoi ca lp ETH, cc bn tin bao gm: Ethernetunicast, multicast hoc

broadcast, tun theo chun IEEE 802.32002.


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o Lp dch vng dng (Application Services Layer)Lp dch v ng dng h tr cc dch v s dng truyn ti trn nn mng

Ethernet ca mng MAN-E. C nhiu dch vtrong bao gm c cc vic s dnglp ETH nh mt lp TRAN cho cc lp khc nh: IP, MPLS, PDH DS1/E1

5. Cc im tham chiu trong mng MAN-Eim tham chiu trong mng MAN-E l tp cc im tham chiu lp mng

c s dng phn cc vng lin kt i qua cc giao din. hnh v 1.3 ch ra ccquan h gia cc thnh phn kin trc bn ngoi v mng MAN-E. Cc thnh phn

bn ngoi bao gm:

Tcc thu bao n cc dch v MAN-E T cc mng MAN-E khc Cc mng truyn ti dch v (khng phi Ethernet) khc.

Hnh 1.3:M hnh cc im tham chiu

Cc thu bao kt ni n mng MAN-E thng qua im tham chiu giao dinNgi dng Mng (UNI: Uset Network interface). Cc thnh phn trong cngmng (NE: Internal Network Elements) hoc I - INNIs (InternalNNIs). Hai mngMAN-E c lp c th kt ni vi nhau ti im tham chiu External NNI (E-NNI).Mt mng MAN-E c th kt ni vi cc mng dch v v truyn ti khc ti imtham chiu lin mng Network Interworkinh NNI (NI-NNI) hoc im tham chiulin dch v Service Interworking NNI (SI-NNI)


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Hnh 1.4:Gi ao din UNI vm hnh tham chiu MAN-E

Giao din UNI s dng kt ni cc thu bao n nh cung cp dch v MAN-E. UNI cng cung cp im tham chiu gia cc thit b mng MAN-E thuc nhcung cp dch v v cc thit b truy nhp ca khch hng. V vy UNI bt u tim cui ca nh cung cp dch vv im u ca khch hng, Giao din UNI

pha nh cung cp dch vl im tham chiu UNI-N. Giao din ph khch hng lim tham chiu UNI-C. Phn bit gia UNI-N v UNI-C l im tham chiu T.Trong phn cc thit b khch hng thng c chia thnh thit b truy nhp vthit bngi s dng u cui. gia hai thit bny c im tham chiu S.

6. Cc thnh phn vt l trong mng MAN-ECc thit b vt l trong mng l cc thnh phn mng (NE: Network Element)

trong mng MAN-E. Mt thit b c th c nhiu chc nng khc nhau v thucnhiu lp khc nhau trong m hnh mng MAN-E.

Cc thit b bin khch hng (CE: customes Edge)

Thit b CE l thnh phn vt l thuc kin trc mng MAN-E thc hin ccthnh phn chc nng thuc mng khch hng yu cu cc dch v t nh cungcp mng MAN-E. Cc thnh phn chc nng ring l ca mt CE c th hon tonthuc pha khch hng hoc hon ton thuc pha nh cung cp dch v. Mt thit bCE ti thiu phi p ng c khnng lm vic vi giao din UNI-C. Thit b

CE c th l Swtich (Ethernet, Router(IP/MPLS) hoc mt thit bu cui. thngthng cc thnh phn chc nng ca CE c th thuc lp ETH layer, TRAN layerhoc APP layer.

Thit b bin nh cung cp dch v (PE: Provider Edge)

Thit b PE l cc router c chc nng cung cp chc nng kt ni n khchhng hoc kt ni n mng ngoi khc thuc lp ETH. Khi cung cp kt ni n


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khch hng, thit b PE cung cp tp cc chc nng lin quan n giao din UNI-N.

Thit b li ca nh cung cp dch v (P: Provider Core)

Thit b P hay cn gi l Core Router, l cc router khc ca nh cung cp dch

v thuc lp ETH leyer, thit b P khng tham gia vo cc chc nng thuc giaodin UNI-N/E-NNI.

Thit b kt cui mng (NT: Network Termination)

Thit b NT thc hin chc nng thuc lp TRAN layer gia im cui ca nhcung cp dch vm im u ca khch hng. Cc thit bNT m nhim chcnng gim st hiu nng ng truyn vt l, nh thi, chuyn i m ha gia ccthnh phn.

Thit b bin truyn ti(TE: Transport Edge)

Thit b TE cho php ghp knh cc lung d liu ca nhiu khch hng vocng mt ng truyn vt l.

7. Li ch dng dch v EthernetNhiu nh cung cp dch v cung cp dch vMetro Ethernet. Mt s nh

cung cp mrng dch v Ethernet vut xa phm vi mng ni th (MAN-E) vvn n phm vi mng din rng (WAN). Hng triu thu bao c s dngdch v Ethernet v slng thu bao ang tng ln mt cch nhanh chng. Nhngthu bao ny b thu ht bi nhng li ch ca dch vEthernet em li, bao gm:

Tnh d s dng. Hiu qu v chi ph (cost effectiveness). Linh hot.

Tnh d sdng

Dch v Ethernet da trn mt giao din Ethernet (Ethernetinterface) chun, phbin dng rng ri trong cc ht hng mng cc b(LAN). Hu nh tt c cc thitb v my ch trong LAN u kt ni dng Ethernet, v vy vic s dng Ethernet

kt ni vi nhau sn gin ha qu trnh hot ng v cc chc nng qun tr,qun l v cung cp (OAM &P).


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Hiu qu v chi ph

Dch v Ethernet lm gim chi ph u t (CAPEX-capital expense) v chi phvn hnh (OPEX-operation expense):

Mt l, do s ph bin ca Ethernet trong hu ht tt c cc sn phmmng nn giao din Ethernet c chi ph khng t.

Hai l, t tn km hn nhng dch v cnh tranh khc do gi thnh thitb thp, chi ph qun tr v vn hnh thp hn.

Ba l, nhiu nh cung cp dch v Ethernet cho php nhng thu bao tngthm bng thng mt cch kh mm do.. iu ny cho php thu baothm bng thng khi cn thit v h h tr cho nhng g h cn.

Tnh linh hot

Dch v Ethernet cho php nhng thu bao thit lp mng ca h theo nhng

cch hoc l phc tp hn hoc l khng th thc hin vi cc dch v truyn thngkhc. V d: mt cng ty thu mt giao tip Ethernet n c th kt ni nhiu mngv tr khc nhau thnh lp mt Intranet VPN ca h, kt ni nhng i tckinh doanh thnh Extranet VPN hoc kt ni Internet tc cao n ISP. Vi dchvEthenet, cc thu bao cng c th thm vo hoc thay i bng thng trong vi

pht thay v trong vi ngy hoc thm ch vi tun khi s dng nhng dch v mngtruy nhp khc (Frame relay, ATM,). Ngoi ra, nhng thay i ny khng i hithu bao phi mua thit b mi hay ISP ca cn b k thut n kim tra, h trtich.

II.CC DCH V CUNG CP QUA MNG MAN-E1. M hnh dch v Ethernetxc nh cc loi hnh dch v cung cp qua mi trng Ethernet, trc ht

cn xem xt m hnh tng qut. M hnh dch v Ethernet l m hnh chung chocc dch vEthernet, c xy dng trn da trn c ss dng cc thit b khchhng truy cp cc dch v. Trong m hnh ny snh ngha cc thnh phn c

bn cu thnh dch vcng nh mt sc tnh cbn cho mi loi hnh dch v.Nhn chung cc dch vEthernet u c chung mt sc im, tuy nhin vn cmt sc tnh c trng khc nhau cho tng dch vring. M hnh c bn cho

cc dch v EthernetMetro nh ch ra trn hnh sau.


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Hnh 2.1 M hnh cung cp cc dch v Ethernet qua mng MAN-E

Cc dch v Ethernet c cung cp bi nh cung cp mng Ethernet Metro.Thit b khch hng ni n mng ti giao din ngi dng - mng (UNI) s dng

mt giao din Ethernet chun 10Mbps, 100Mbps, 1Gbps hoc 10Gbps.Trong m hnh ny ch yu cp n cc kt ni mng m trong thu bao

c xem l mt pha ca kt ni khi trnh by v cc ng dng thu bao. Tuynhin cng c th c nhiu thu bao (UNI) kt ni n mng MAN t cng mt vtr.

Trn c scc dch vchung c xc nh trong m hnh, nh cung cp dchv c th trin khai cc dch v c th tu theo nhu cu khch hng. Nhng dch vny c thc truyn qua cc mi trng v cc giao thc khc nhau trong mngMan-E nh SONET, DWDM, MPLS, GFP, .... Tuy nhin, xt tgc khch hng

th cc kt ni mng xut pht t pha khch hng ca giao din UNI l cc kt niEthernet.

2. Knh kt ni o Ethernet (EVC: Ethernet Virtual Connection)Mt thnh phn c bn camng MAN-E l knh kt ni o Ethernet. Mt EVC

l mt knh kt ni gia hai hoc nhiu giao din UNI. Cc giao din UNI ny cgi l cc giao din UNI thuc knh EVC. Mt giao din UNI c th c th thucmt hay nhiu knh EVC ty thuc vo s ghp knh trn dch v. Mi khung dchvi vo mng MAN-E phi n 1 EVC no , giao din UNI m khung dch vi n vo MAN-E gi l UNI u vo. Khung dch vi vo khung EVC sc truyn n mt giao din UNI khc thuc knh EVC v khng th truynn giao din UNI khng thuc knh EVC. Mi knh EVC lun cho php truyntheo hai hng.

C hai loi knh EVC l EVC imim v EVC a im.

imim: l knh EVC kt ni hai giao din UNI vi nhau.

Khung dch vi vo giao in UNI ny ch c thi ra giao din UNI kia vngc li.


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Hnh 2.2EVC imim

m: l knh EVC kt ni thai giao din UNI tr ln vinhau.

Knh EVC a im c hai giao in UNI khc vi knh imim ch cth thm vo mt hoc nhiu giao din UNI khc. C hai loi knh EVC aim l knh EVC a ima im v knh EVC dng cy.

ma im, cc giao din UNI kt ni bnh ng vi nhau. Mikhung dch v c thc truyn trc tip t UNI ny n bt k mt UNI nokhc cng thuc vo knh EVC.

Hnh 2.3EVC ima im

ng cy, c mt s giao din UNI c xem l gc v cc giao dinUNI cn li l l. Gi tin tgiao din UNI gc v c th truyn trc tip n tt ccc giao din UNI khc cng thuc knh EVC. Vi cc giao din UNI l, nu muntruyn n mt giao din UNI khc phi truyn qua giao din gc.


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Hnh 2.4 EVC dng cy

3. Cc loi dch v trong MAN-ENguyn thy ca Ethernet l cung cp kt ni v khng cung cp cc dch v

WAN. Vi h thng Metro cc nh cung cp dch v bt u s dng cng ngh ktni Ethernet cung cp cc dch v. Da vo giao thc Ethernet 802.3 ca IEEE,cng thm cc tham s v dch v to nn cc dch v Ethernet.

MAN-E c cc dch vc bn l: dch v Ethernet Line (E-Line), Ethernet LAN(E-LAN) v Ethernet Tree (E-Tree). Da vo cc dch vc bn ny, cc nh cungcp dch v c tha ra nhiu loi hnh dch v khc nhau cho khch hng.

3.1.Khun khnh ngha dch v Ethernet (EthernetDefinition Framework) gip nhng thu bao c th hiu r hn s khc nhau trong cc dch v

Ethernet, MEF pht trin cc Khun khnh ngha dch v Ethernet. Mc tiuca h thng ny l:

nh ngha v t tn cho cc kiu dch v Ethernet. nh ngha nhng thuc tnh (attribute) v cc thng s ca thuc tnh

(attribut parameters) c dng nh ngha mt dch v Ethernet ringbit.


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Hnh 2.5 Khun khnh ngha dch v Ethernet

nh r mt cch hon ton v dch v Ethernet, nh cung cp phi xc nhkiu dch v v UNI; cc thuc tnh ca dch vEVC kt hp vi kiu dch v. Cc thuc tnh ny c thc tp hp li theo nhng dng sau:

o Giao din vt l (EthernetPhysical Interface).o Thng slu lng (Traffic Parameters)o Thng s v hiu nng (PerforMAN-Ece Parameters).o Lp dch v (Classof Service).o Service Frame Deliveryo H trcc th VLAN (VLAN Tag Support)o Ghp dch v (Service Multiplexing).o Gp nhm (Bundling).o Lc bo mt (Sercurity Filters).

3.2.Dch v E-LineDch v knh Ethernet cung cp kt ni o Ethernet im - im (EVC) gia hai

UNI nh minh ho trn hnh 2.6. Dch v E - Line c s dng cho kt ni im -

im.

Hnh 2.6 Dch v E-Line

Dch v E - Line c th cung cp bng thng i xng cho truyn s liu theohai hng. dng phc tp hn n c th to ra tc thng tin tt nht (CIR) vkch thc khi tt nht (CBS), tc thng tin nh v kch thc khi nh tr,

jitter, mt mt thc hin gia hai UNI c tc khc nhau.


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Ti mi UNI c th thc hin ghp dch v t mt s EVC khc nhau. Mt sEVC im - im c thc cung cp trn cng mt cng vt l ti mt trong ccgiao din UNI trn mng.

Mt dch v E-Line c th cung cp cc EVC im - im gia cc UNI tngt s dng cc chuyn tip khung PVC kt ni cc bn vi nhau.

Mt dch v E -Line c th cung cp mt kt ni im - im gia cc UNItng tnhau n mt dch vng ring TDM. y l dch v kt ni gia haiUNI v to ra cc khung dch v hon ton trong sut gia cc UNI, tiu v tica khung c trng cho UNI ngun v ch.

Nhn chung dch v E -Line c thc s dng xy dng cc dch vtngt cho chuyn tip khung hoc cc ng thu ring. Tuy nhin, di bng tn v cckhnng kt ni ca n ln hn nhiu.

3.3.Dch v E-LANDch v LAN Ethernet cung cp cc kt ni a im, chng hn c th kt ni

mt s UNI vi nhau nh ch ra hnh sau.

Hnh 2.7 Dch v E-LAN

S liu thu bao gi t mt UNI c thc nhn ti mt hoc nhiu UNI khc.

Mi UNI c kt ni n mtEVC a im. Khi c cc UNI thm vo, chngc kt ni n cng EVC a im do n gin ho qu trnh cung cp v kchhot dch v.

Dch v E -LAN theo cu hnh im - im.Dch v E -LAN c thc s dng kt ni chhai UNI, iu ny dng

nh tng t vi dch v E -Line nhng y c mt s khc bit ng k. Vidch v E -Line, khi mt UNI c thm vo, mt EVC cng phi c bsung kt ni UNI mi n mt trong cc UNI tn ti. Hnh 1.12 minh ho khi mtUNI c thm vo v s c mt EVC mi c bsung tt c cc UNI c thkt ni c vi nhau khi dng dch vu E -Line.


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Hnh 2.8 Qu tr nh thc hin khi thm mt UNI vo mng MAN-E

Vi dch v E -LAN, khi UNI mi cn thm vo EVC a im th khng cn b

sung EVC mi v dch v E - LAN s dng EVC a im - a im. Dch v nycng cho php UNI mi trao i thng tin vi tt c cc UNI khc trn mng. Trongkhi vi dch v E Line th cn c cc EVC n tt ccc UNI. Do , dch v E- LAN ch yu cu mt EVC thc hin kt ni nhiu bn vi nhau.

Tm li, dch v E - LAN c th kt ni mt slng ln cc UNI v s t phctp hn khi dng theo dng li hoc hub v cc kt ni s dng cc k thut ktni im - im nh Frame Relay hoc ATM. Hn na, dch v E-LAN c thc s dng to mt lot dch vnh mng LAN ring v cc dch v LANring o, trn c sny c th trin khai cc dch v khch hng.

3.4.Dch v E-TreeE-Tree l nhng dch v Ethernet cung cp kt ni dng cy. Cc kt ni ny

da v knh EVC dng cy. Mi cy u c mt hoc nhiu gc. Trng hp ngin nht l c mt gc. Dch v E-Tree c mt gc c m t trong hnh v 2.9.

Hnh 2.9 Dch v E-Tree


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Vi kiu dch v E -Tree mt giao din UNI l ch truyn d liu thng qua giaodin UNI gc m khng truyn trc tip n cc giao din UNI l khc c. Giaodin UNI gc c th truyn trc tip n tt c cc l. Dch v E-Tree thng cng dng cho cc khch hng doanh nghip c nhu cu kt ni ima im giatrung tm v cc chi nhnh. Cc chi nhnh chc kt ni vtrung tm, khng kt ni

trc tip gia cc chi nhnh.Vi kiu dch v E-Tree nhiu gc, c nhiu giao din UNI c chn l UNI

gc. Cc UNI gc ny c th truyn d liu sang nhau v sang cc UNI l.

Hnh 2.10 Dch v E-Tree nhiu gc

Trong nhiu trng hp cc giao din UNI gc c cu hnh d phng. Khigiao din UNI ny b li th vic chuyn tip d liu s do UNI dphng mnhim. Vi dch v E-Tree c th phn thnh hai loi dch v l Ethernet PrivateTree (EP-Tree) v Ethernet Virtual Private Tree (EVP-Tree). Dch v EP-Tree datrn giao din vt l do khch hng c thqun l cc VLAN ca mnh m khng

cn thng bo hay can thip ca nh cung cp dch v. EP-Tree thng ng dngcho cc khch hng cn qun l tp trung hoc phn phi thng tin ti mt hocnhiu im khc nhau.

Ti a im phn phi giao din UNI c chn s l UNI gc ti cc im tipnhn UNI s l UNI l. Dch v EVP-Tree da trn VLAN, trng hp ny thngs dng cho cc khch hng cn a ra nhiu chnh sch truy cp khc nhau chongi s dng ca mnh.

4. Cc thuc tnh dch v EthernetVi mi loi dch vu Ethernet c yu cu v tham sv cc c tnh ring. MEF

a ra cc thuc tnh v tham s cho cc dch v nh sau:4.1.Thuc tnh ghp knh dch v

Ghp dch v cho php nhiu UNI thuc vcc EVC khc nhau. UNI nh vygi l UNI c ghp dch v (service multiplexed UNI). Khi UNI ch thuc mtEVC th UNI ny gi l UNI khng ghp dch v (non -multiplexed UNI).


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Hnh 2.11 Ghp knh dch v

Li ch ca ghp knh dch v cho php ch cn mt cng giao din UNI c thh trnhiu kt ni EVC. iu ny lm gim chi ph thm cng UNI v d dngtrong vic qun tr. VLAN c cu hnh ti cng thit b khchhng CE kt ni viUNI c gi l CE -VLAN. Nh vy, ti mi UNI c mt nh x (mapping) giaCE-VLAN v EVC.

iu ny gn ging nh nh x gia DLCI v PVC trong Frame Relay. Tnhtrong sut VLAN (VLANtransparency): Mt EVC c tnh trong sut VLAN khiCE-VLAN khng thay i khi khi qua giao din UNI. Ngha l, CE-VLAN cakhung i ra (egress frame) hng t MAN-E ra mng ca khch hng lun gingCE-VLAN ca khung i vo (ingress frame). Tnh nng ny c u im lm gimvic nh s li (renumbering) VLAN ca khch hng.

4.2.Thuc tnh giao din vt l EthernetBao gm cc tham s sau:

ng truyn vt l: Cc ng truyn vt l theo chun IEEE 802.3. Vd: 10BASE-T, 100BASE-T, 1000BASE-X.

Tc truyn: Tc Ethernet. V d:10Mbps, 100bps, 1Gbps, 10Dbps. Ch truyn: Full Duplex/ Halp Dulplex, AutoNegotiotion. Lp MAC: Cc tiu chun v lp MAC theo tiu chun 802.32000.

4.3.Cc thuc tnh vlu lngMEF nh ngha tp hp cc thuc tnh vbng thng (Bandwidth Profile) cho

UNI v cho EVC. Mt Bandwidth Profile l mt gii hn v tc khi frametruyn qua UNI hay EVC. i vi cac kt ni im im vic tnh ton bngthng trn ng truyn c thn gin, nhng vi cc kt ni a ima im,c bit l c ghp knh EVC trn cng mt giao din vt l, vic tnh ton bngthng rt phc tp. Vi trng hp cnkt hp tnh ton vi o c thc tin.


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c tnh bng thng bao gm cc loi sau:

Bng thng vo v ra ti miUNI(Tc cng vt l) Bng thng vo v ra ti mi EVC(Tc p theo VLAN) Bng thng vo v ra cho mi lp dch v (Ty vo loi d liu Voice,

Video, Data,... sc bng thng theo mc u tin khc nhau) Bng thng vo UNI t EVC Bng thng ra EVC t UNI

c tnh bng thng gm cc tham s vlu lng sau: CIR (Committed Infomation RateTc truyn thng cam kt): l tc

ti thiu truyn ti dch viu kin bnh thng. Mt dch v cth h tr mt CIR cho mt VLAN trn mt UNI. Tuynhin khi ghpdch v th tng CIR khng thvt qu tc ca cng vt l. Bn cnhCIRMEF cn nh ngha thm tham s CBS (Commited Burst Size) l

kch thc lu lng ti a cho php i vi mi thu bao, thng tnhbng KB hoc MB. V d:thu bao c cp CIR l 3Mbps v CBS l500KB th thu bao sc m bo bng thng ti thiu l 3Mbps vkch thc khung d li ti a l 500KB, nu khung c kch thc lnhn 500KB th khung s b hy hoc b tr.

PIR (Peak Infomation Rate): L tc cao hn mc CIR cho php lulng truyn trn mng khi khng c tc nghn xy ra. Cng vi PIR ltham sMBS (Maximum Burst Size) l kch thc khung ti a cho phptruyn m khng b hy. MBS cng c tnh bng KBhoc MB nhCBS. V d: mt dch v c cp bng thng l 3Mbps CIR, 500KBCBS, 10Mbps v 1MB MBS.o Nu bng thng ca thu bao = 3Mbps v = 10Mbps th s b hy.4.4.Cc thuc tnh v hiu nng

Cc thuc tnh hiu nng biu th smong i cht lng t pha khch hng.Cc tham s bao gm: kh dng (Avaiability), tr khung (Delay), trikhung (Jitter) v t l mt khung (Loss).

kh dng (Avaiability): kh dng ca dch vc din t thngqua mt s thuc tnh dch v sau:


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o Thi gian kch hot dch v ca UNI: l thi gian tnh t lc bt uc yu cu mt dch v mi hoc sa i dch v cho ti lc dch vc kch hot v a vo s dng. Thi gian kch hot trung bnhca dch v Ethernet ch c vi ging h, ngn hn nhiu so vivi thng khong thi gian cn thit kch hot dch v mi i

vi cc m hnh truyn thng truyn thng.o Thi gian khi phc dch v ca UNI: l thi gian tnh t lc UNI

khng hot ng c th do s c xy ra ti lc n c phc hi vtrli hot ng bnh thng.

o Thi gian kch hot dch v EVC: l thi gian tnh t lc bt u cyu cu mt dch v mi hoc sa i dch v cho ti lc dch vc kch hot v a vo s dng. Hay c thhn, khong thi gianny c tnh t lc c yu cu mt dch v mi hoc sa i dch vcho ti khi tt c cc UNI trn EVC u c kch hot. Vi mtEVC a im, dch vc coi l sn sng c truyn khi tt c cc

UNI thuc vEVC u c kch hot v hot ng. Tt c ccdch v Ethernet u c cung cp cho khch hng thng qua ccEVC.

o Thi gian khi phc dch v ca EVC: l thi gian tnh t lc mEVC khng hot ngc th do s c sy ra, ti lc c phc hiv trli hot ng bnh thng.

tr khung (Delay): l tham s nh hng n cht lng dch v(QoS) i vi cc ng dng thi gian thc. Tham s trthng cp dngcho mt hng truyn i, tr gia hai im l khong thi giankhung xut pht t mt giao din UNI i qua mng MAN-Ev n giao

din UNI bn kia. tr bnh hng bi tc ng truyn v dikhung Ethernet.V d: mt khung Ethernet c di 1518 byte i quang truyn 10Mbps th n tr12ms (1518 x 6/106). Ngoi ra tr cn

bnh hng bi tc truyn trn mng trc v cp tc nghn. Thams tr thng c nh gi bng tr ca 95% s khung ctruyn i thnh cng trong mt khong thi gian.

V d: tr l 15ms trong 24 gic ngha l 95% skhung c truyn imt chiu trong thi gian 24 gic tr nhhn hoc bng 15ms.

tri khung (Jiiter): Cng l mt tham snh hng n cht lngdch v. tri khung cn c gi l bin thin tr. tri khunggy hi cho cc ng dng thi gian thc nh thoi, Video IP.

T l mt khung (Loss): t l mt khung c nh ngha l t l phntrm s khung dch v tun th tc thng tin tha thun song khng c truyn i gia cc UNI trong mt khong thi gian cho trc.V d: mt knh EVC imim c 100 khung c truyn i nhng

bn nhn ch nhn c 90 khung th t l mt khung l 10%. Ty votng ng dng m t l mt khung c nh hng ln hay khng. V


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d: cc dch vng dng web hai email thng t bnh hng bi t lmt khung so vi cc ng dng VoIP.

4.5.Thuc tnh lp dch v (Class of Service Indentifier Service Attribute)Cc thuc tnh lp dch v (CoS) c thc nh ngha cho cc khch hng

da trn cc thuc tnh nh sau:

Cng vt l: y l hnh thc n gin nht p dng QoS cho khchhng. Da vo cng vt l ti giao din UNI, tt ccc lu lng vo vra cng ny u c chung mt CoS.

a ch MAC ngun/ch: Vic phn loi ny s dng cung cp ccloi dch v khc nhau da v ca ch MAC ngun v ch. M hnhny tuy n gin nhng kh qun l theo tng dch v. Trong trng hpthit b pha khch hng (CPE) l Switch lp 2 v dch v cung cp ldch v LAN kt ni n LAN th c rt nhiuhng trm thm ch hngnghn a ch MAC cn c gim st v qun l.

Trng hp thit b pha khch hng l Router th ch cn gim st a chMAC ca router kt ni, vi trng hp ny kh nng qun l s ngin v ddng hn.

VLAN ID: VLAN ID sc gn cho CoS trong trng hp khch hngs dng cc dch v khc nhau vi ccVLAN khc nhau.

Gi trtrng 801.1p: cho php gn n 8 cp u tin khc nhau chocc lu lng ca khch hng. Thc t cc nh cung cp dch v khngthch dng trn 3 cp v kh qun l.

Type of Service (ToS): trng loi dch v bao gm 3 bit nm trong gitin IP cho php chialm 8 lp dch vkhc nhau. Trng ToS ny cng

tng t nh trng 802.1p, nhng ToS nm tiu gi tin IP cn802.1p nm tiu ca khung Ethernet.

4.6.Thuc tnh truyn khung dch v (Service Frame Delivery Attribute)Mng Metro ging nh mt mng LAN chuyn mch, v vy cn bit loi khung

no c truyn i v loi khung no khng c truyn i trn mng. Thngthng cc khung truyn trn mng cha d liu thng tin iu khin. m bomng khch hng c y cc tnh nng cn thit, khch hng v nh cung cpcn tha thun loi khung no c truyn v loi khung no khng c truyn.Cc thuc tnh dch v EVC c thnh ngha cho loi khung no bi hy b, loikhung no truyn i v loi khung no chc truyn i vi cc cp giao dinUNI c th. Cc khnng khc nhau ca khung d liu Ethernet nh sau:

Unicast Frame: l cc khung c a chMAC ch n c th. Nu a chch c nhn bit, khung s c truyn n ch, nu khng nhn

bit c h thng s truyn n tt ccc a ch trong cng VLAN. Multicast Frame: l cc khung c truyn n mt nhm a ch MAC

ch. Cc khung ny c bit Mang trong s thp nht (LSB: least


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significant bit) ca a chch c gn bng 1 (trtrng hp gi tinqung b c tt ccc bit u bng 1)

Broadcast Frame: l khung truyn n tt c cc a ch khc trongmng theo chun 802.3, khung broadcast c gi tra chMAC ch lFF-FF-FF-FF-FF-FFFF.

4.7.Thuc tnh h trVLAN Tag (VLAN Tag Support Attribute)VLAN tag h trcung cp tp hp cc khnng quan trng cho vic truyn cc

khung dch v. Cc mng LAN doanh nghip thuc mt mi trng khch hngn l tc l tt cngi s dng u cui thuc v mt t chc. VLAN tag trongmt t chc cc nhm khc nhau trong cng mt Broadcast domain logic. MetroEthernet to ra mi trng gm nhiu doanh nghip cng dng chung mt c shtng mng v mi doanh nghip c mt mi trng ring. Vic h tr nhiu cpVLAN gn VLAN tag rt quan trng. Mi khch hng c th c nhiu VLANkhc nhau v c th trng vi cc khch hng khc, v vy phn bit cc khch

hng vi nhau, nh cung cp dch v to ra mt cp VLAN khc phn bit cckhch hng. C hai dng VLAN tag l VLAN tag Preservation/Stacking v VLANtag Translation/Swapping.

VLAN tag Preservation/Stacking

Mc ch ca Metro Ethernet l kt ni cc Site ca khch hng li vi nhau.Trong thc t, mi khch hng c mt tp cc VLAN v c th trng lp VLAN IDvi VLAN ID ca khch hng khc. phn bit cc VLAN ca cc khch hngvi nhau, Provider gn cho mi khch hng mt VLAN ID ring gi l CarrierVLAN hay S-VLAN v gi trny c s dng truyn trong mng. Nh vy

trong header ca frame s cha gi tr S-VLAN v S-VLAN.


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Hnh 2.12 VLAN tag Preservation/Stacking

Vic t S-VLAN pha trc C-VLAN phn bit lu lng ca cc khchhng nh vy c gi l 802.1q in 802.1q hay cn gi l ngn xp Q-in-Q. TrongQ-in-Q, SVLAN dng gn cho khch hng cn C-VLAN ch gn cho ni b cakhch hng v c n i khi truyn qua mng MAN-E.

VLAN tag Translation/Swapping

Thng thng VLAN tag ti u vo v u ra ca mt kt ni l ging nhau.Trong trng hp c hai khch hng mun kt ni cc mng LAN ca h vi nhaunhng gi tr C-VLAN ca mi bn li khng tngng vi nhau, nh cung cpdch v cho php loi bC-VLAN mt pha ca EVC v chuyn dch thnh gi trC-VLAN pha kia ca EVC. Nu khng c dch v ny th chc mt cch duynht lm l thc hin IP routing.

Mt v d khc l nhiu khch hng cng yu cu cung cp kt ni Internet nISP qua mng Metro. Trong trng hp ny, trong cng frame ca khch hng

khng c C-VLAN nh cung cp dch vgn cho khch hng vo EVC tng ngvi S -VLAN. VLAN tag ch c S-VLAN sc gbtrc khi n router caISP. V d cc khch hng gi gi tin khng gn VLAN tag n giao din UNI.Khch hng 1 c gn SVLAN 10, khch hng 2 c gn S-VLAN 20, khchhng 3 c S-VLAN 30 phn bit lu lng ca tng khch hng. Khi n router

pha nh cung dch v n sc loi b v cng kt ni vo Internet.


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Hnh 2.13 VLAN tag Translation/Swapping

4.8.Thuc tnh v gp nhm (Bundling Attribute)Trong cu trc frame ca 802.1Q th c mt trng 12 bit l VLAN tag. Nhuvy c ti a l 4096 VLAN cho mt min lp 2 (layer 2 domain). Vi tnh nng

gp nhm, c nhiu hn mt CE-VLAN c nh x vo mt EVC ti UNI. Khi ttcVLAN u c nh x vo mt EVC th EVC c thuc tnh gp nhm tt ctrong mt (All-toone Bundling).

4.9.Thuc tnh bo mt (Security Fillters Attribute)Mng Metro Ethernetcung cp mng ring o lp 2 (layer 2 VPN) nn nhng

vn an ninh tn ti ti lp 2 ny nh: T chi dch v (DoS: Denial of Service),trn ngp MAC (MAC flooding), gi mo a ch MAC (MAC spoofing) cn c

bit quan tm. Do Ethernet Service s dng access list vi a ch MAC bomt cho cc EVC. Nhng a ch MAC tha mn Access List c thc cho phphoc khng cho php EVC .

III.M HNH TRIN KHAIMNG MAN-E TI VNPT1. KIN TRC MNGM hnh trin khai h thng mng ca VNPT bao gm cc cng ty truyn ti

(VTN, VTI), cc cng ty cung cp dch v (VDC, VASC) v cc cng ty cung cpkt ni n khch hng (cc cng ty vin thng tnh, thnh). H thng mng MAN-

E c trin khai ti cc cng ty vin thng tnh, thnh ph nhm cung cp kt nin khch hng.

Hin ti VNPT ang xy dng h thng mng NGN bao gm mng li, mngbin, mng MAN-E v mng access.


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Vc bn, h tng Mng MAN-Ebao gm 5 phn lp:

- Lp mng trc (IP/MPLSCore): hnh thnh mt li chuyn mch gi chungda trn cng ngh MPLS, kt ni tt c cc tnh thnh trong cnc.

- Lp mng bin (IP/MPLS Edge): x l thng tin trc khi core MPLS. Bc

tch nhn, gn nhn, thc hin prpvision dch v, thit lp QoS MPLS, trafficengineering

- Lp mng tp trung lu lng (IP/MPLS Aggregation over Ethernet): mbo tp trung lu lng t cc mng truy cp (IP DSLAM, ETTx, UMTS) timng trc (BRAS).

- Lp mng truy cp (Access): cung cp kt ni dch v ti khch hng (ccdch vCable, xDSL, PON hay ETTx) thng qua cc thit b truy cp nh IP DSLAM, ETTx, UMTS hay Ethernet Switches).

- Lp mng bin khch hng (Subscriber Edge): ng vai tr bin mng pha

khch hng, cung cp kt ni ti lp truy cp ca nh cung cp dch v v cung cpdch v cho nhng ngi s dng bn trong mng.

Hnh 3.1: Cu trc phn lp mng MAN-E

2. MNG MAN-E DA TRN CNG NGH MPLSKhng nh cch thc nh tuyn truyn thng, MPLS s dng cc nhn di

chuyn lu lng qua cc min (domain) MPLS. Khi cc gi i vo domain MPLS,

cc nhn c gn vo cc gi tn, v mi nhn (khng phi header IP) xc nhchng tip theo. Cc nhn sc loi b ti li ra ca mi domain MPLS. Khi mtgi tin c gn nhn n mt b phn nh tuyn chuyn mch nhn LSR (LabelSwitching Router), nhn n s xc nh ng dn ca gi tin ny trongmngMPLS. Vic hng tip i theo nhn MPLS s thay th nhn ny bng mt nhn rathch hp v gi gi tin n chng tip theo.


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Cc nhn c gn vo cc gi tin da trn vic phn nhm hoc theo cc lptng ng chuyn hng i FEC (Forwarding Equivalence Classes). Cc gi tinthuc v cng mt lp FEC sc xl nh nhau. H thng hng i v tra cuMPLS cho php phng thc nh tuyn iu khin xc nh (Explicit ControlRouting), da trn c sa ch ngun v ch, cho php trin khai cc dch v IP

mi trn mng. Chuyn mch nhn tng c s dng cho k thut chuyn i.ATM s dng cng mt k thut hng gi tin ithng qua trng nhn dngknh o/ ng dn o VPI/ VCI m khng cn quan tm n ti (payload) IP.

Hnh 3.2: Chn header tr ong M PLS

Tiu chun MPLS c IETF pht hnh, pht trin t chuyn mch nhn Cisco(Cisco Tag Switching). IETF khuyn ngh s dng chuyn mch nhn da trnheader chn 32 bit bao gm nhn kch thc 20 bit, trng Exp 3 bit, trng Stack1 bit, trng TTL 8 bit nh trn hnh 3.2.

Hnh 3.3: Gi tin gn nhn M PLS

Trng stack 1 bit s dng ch th rng n y ca stack s dng trongtrng hp cc nhn c t chc theo ngn xp (tc l MPLSVPN hoc bo vtuyn kt ni). Cc bit Exp s dng mang thng tin lin quan n cht lngdch v. Cc nhn c chn thm vo gia header lp 2 vo lp 3 hoc trongtrng VCI/VPI trn cc mng ZTM nh hnh 3.3.


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2.1. Thit klu lng MPLSMc d chuyn mch nhn cung cp cc cng ngh nn cho vic hng i gi

tin thng qua cc mng MPLS, th cng khng th cung cp tt c cc thnh phn h trthit klu lng nh l chnh sch thit klu lng. Thit klu lngTE (Traffic Engineering) nhm n qu trnh la chn cc ng dn c chn

bi lu lng d liu thun tin cho cc qu trnh khai thc mng tin cy v hiuqu, trong khi ti u ng thi vic s dng c hin qu ti nguyn v hiu sutthc hin lu lng. Mc ch ca TE l tnh ton ng dn tnt ny n ntkia sao cho ng dn khng vi phm cc rng buc nh cc yu cu v quntr/ bng thng v l ti u theo mt sthc o v hng. Mt khi ng dn c tnh, TE c trch nhim cho vic thit lp v duy tr trng thi hng i kmtheo ng dn .

Cc thnh phn thit klu lng

Bnh tuyn c khnng h trMPLS c gi l bnh tuyn chuyn mch

nhn LSR. Bnh tuyn LSR ng trc bnh tuyn LSR cui cng trong mtmng MPLS c gi l chng p cht. Mi ng dn MPLS u cuiu cuic gi l ng dn chuyn mch nhn LSP (Label Switching Path). Mi ngdn LSP bt u ti bnh tuyn LSR v kt thc ti bnh tuyn cui.

Cc giao thc nh tuyn gateway bn trong IGP (Interior Gateway Protocol)khng khnng cho vic thit klu lng. Quyt nh nh tuyn hu ht lda trn cc thut ton ng dn ngn nht m ni chung s dng cc thc othm vo nhng khng tnh n mc cn d bng thng hoc c tnh lulng.Cch d nht cung cp cc tnh nng ny l s dng m hnh xp chng(overlay) cho php cc topology o trn mng vt l. Mi topology o c xy

dng tcc ng kt ni o hin ra nh l cc ng kt ni vt l theo giao thcnh tuyn. Hn na, m hnh xp chng cn c khnng cung cp:

nh tuyn trn c srng buc. Chc nng lp chnh sch lu lng v ti lu lng. Khnng tn ti ca cc ng kt ni vt l

Cc khnng ny cho php di chuyn ddng lu lng tng kt ni bnghn sang ng kt ni t nghn hn. MPLS l mt m hnh xp chng s dng

bi TE, n cung cp:

Cc ng dn chuyn mch nhn xc nh khng b rng buc nh ccgiao thc nh tuyn IGP truyn thng.

Cc ng dn chuyn mch nhn LSP c thc duy tr c hiu qu. Cc ng trc lu lng c thc khi to, v nh xvo cc ng

dn LSP. Mt tp cc thuc tnh c thlin quan n cc ng trc lu lng. Tp cc thuc tnh c thlin quan n cc ti nguyn m rng buc vic

sp t cc ng dn LSP v cc ng trc lu lng i qua chng.


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MPLS cho php c vic tp hp v phn tn lu lng khi m vic hng i gitin IP, da trn c sch, ch cho php tp hp. nh tuyn trn c srng bucv bo vng trc c th tch hp d dng qua MPLS, Cc thnh phn sau c tcng n vic h trqu trnh TE:

Phn tn thng tingi thng tin v topology mng v cc rng buc gnlin vi cc tuyn kt ni (tc bng thng).

Thut ton la chn ng dn tnh ton v la chn cc ng ttnht tha mn cc rng buc.

Khi to tuyn s dng giao thc RSVP TE m rng bo hiukhi to cc ng dn chuyn mch LSP.

iu khin chp nhn ng kt ni - quyt nh ng hm no c thc ti nguyn.

iu khin TEthit lp v duy tr cc ng trc. Hng d liu dc theo ng dn.

Vic phn tn thng tin trong TE ph thuc vo cc giao thc IGP phntn/trn ngp d liu lin quan n ti nguyn cn di d ca cc tuyn kt ni baogm bng thng (phn cp t0 n 7), cc thuc tnh ng kt ni, Vic phntn thng tin thc hin trn mi SLR theo chu k hoc theo s kin no nh thayi bng thng, cu hnh ng kt ni, hng hc.

Thut ton trn c s rng buc s dng tm ng dn tt nht cho ming hm LSP. N l c sp t bbnh tuyn pha u ca ng hm chkhi cn mt ng hm mi hoc ng dn chuyn mch nhn ca ng trchin c b hng hoc cn ti u li ng trc hin c.

Bnh tuyn pha u s bt u qu trnh bo hiu khi to ng dn ngn

nht c rng buctc l mt LSP. Thit lp ng dn da trn cc bn tin RSVPTE. Mt giao thc khc l CR LDP cng c s dng cho vic bo hiu khito ng. Tuy nhin LDP hot ng theo kiu connectionless, do vy trongnhiu trng hp m bo cht lng dch v, giao thc RSVP c s dngthay th.

2.2. Phc hi ng hm tin cy ca mng l phn bt buc i vi mng tc cao, m bo cht

lng dch v. Sgin on c th xy ra v nhng l do nh tc nghn trn ngLSP no , ng kt ni hng, nt mng hng hoc thay i qun tr trn mt

LSP no . Mt trong nhng tnh nngph bin nht ca MPLSTE l kh nngcung cp lu lng khng b gin on qua mt LSP. Bo v ng dn (pathprotection) c tht c ti nhiu lp khc nhau trong ngn xp giao thc:

o Lp vt l (nh SONET vi chin lc APS Automatic ProtectionSwitch).

o IP (nh giao thc nh tuyn IGP, BGP thay i chng k tip nu nh cthay i v topology).


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o MPLS (thc hin bi b nh tuyn pha u ph thuc vo sthay i topology).

o Trong ng cnh ang xt l MPLS TE, c mt s la chn cho vic hiphc ng dn.

o nh tuyn li t bnh tuyn pha u (head end reroute).o nh tuyn nhanh li trn csbo v tuyn kt niFast reroute (link

protection).o nh tuyn nhanh li trn c s bo v nt Fast reroute (node

protection). inh tuyn li t b nh tuyn pha uQu trnh ny c tnh n khic mt trong hai s kin: thngbo t RSVP

TE rng ng dn khng cn duy tr c (tc l nghn) hoc thng bo bi IGPv s thay i topology mng. Ph thuc vo tng s kin, b nh tuyn pha us xy dng li c s d liu TE mi sau khi ct b cc tuyn kt ni hoc cc vnghng, nghn, bo hiu li mtng dn mi vi kiu sharedexplicit. Kiu ny

cho php ng dn mi c lp nn trn c s c th s dng mt s tuyn ktni c.

Do qu trnh thc hin nh tuyn li lin quan n nhiuqu trnh x l khcnhau nn thng thng thi gian cho vic nh tuyn li theo phng n ny c thln n vi giy. Thi gian tiu tn ny khng thch hp cho mt s ng dng.Trong khi MPLS FRR cung cp c cu bo v nhanh hn nhiu (di 50msmtuy rng thi gian tng cng c th ln hn hoc nh hn 50ms cn ty thuc vo

phn cng, s lng ng hm v s lng mng trong ).

Bo v tuyn kt ni FRRFRR (Fast ReRoute) thit lp th tc cho php nh tuyn li xung quanh tuyn

kt ni b hng. ng dn LSP c inh tuyn n chng tip theo s dngng hm d phng c xc lp trc. ng hm d phng phi c cuhnh sao cho LSP c th n c b nh tuyn pha di chng tip theo mkhng i qua tuyn kt ni ang hng. FRR cho vic bo v tuyn kt ni ch phcv cho vicbo v tuyn kt ni xc nh.

Hnh 3.4: Lunggi tin/nhn khi thc hin FRR chbov tuyn kt ni


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Nh hnh 3.4 trn c th thy tuyn kt ni t R2 sang R3 c d phngFRR. Khi xut hin s c trn tuyn kt ni R2 v R3, cc gi tinh i t R1 n R6s c chuyn sang ng d phng theo tun t R1, R2, R4, R3, R5, R6. Khi nhn cho cc gi tin t R2 n R3 c gn l 2001trong trng hp bnh thngs c bo ton v c bao bi nhn 1200khi chuyn n R4. Ti R4 nhn 40 s

c loi bv gi tin li c nhn 2001chuyn n R3. Bov nt FRR

Hnh 3.5: L ung gi tin/nhn khi thc hin FRR cho bao v nt

Nh hnh 3.5 cho thy ng dn dch v LSP l R1, R2, R3, R5, R6.Nu k hoch bo v nt R3 thc hin th c th c cc ng d phng cng quant R3 nh sau: 1) R2, R4,R5, R3 hoc 2) R2, R4, R5. Trong trng hp u,ng dn LSP d phng s l R1, R2, R4, R5, R5, R5, R6. Tuy nhin trong trnghp ny ng kt niR3 v R5 lu lng trn b nhn i, v vy

khng phi l phng n ti u. Trng hp sau khi ng dn d phng l R1,R2, R4, R5, R6 l ti u v c gi l d phng theo chng tip tip theo hay

bo v nt. Bo v nt thc s l phc tp hn bo v khi R2 cn phi bit v nhnc s dng trn tuyn kt ni l R3 v R5, khi R5 mong mun nhn c nhnchnh xc d thng qua ng d phng. Vic s dng mt i tng m rngRoute Record s cho php R2 hc c nhn ny.

2.3. H trcht lng dch v trong MPLSC hai loi kin trc b sung cho khnng cht lng dch vQoS l cc

dch v tch hp (IntServ) v cc dch v phn bit (DiffServ). Cc dch v IntServ

duy tr cht lng dch vQoS u cui u cui cho mi mt hoc mt nhmlung (flow) vi s trgip ca giao thc RSVP. Trong m hnh DiffServ, mi gitin khi vo mng h trDiffServ sc nhm li thnh mt s cc lp nh. Milp c mu hoc c nh du lin quan (s dng cc bit DSCP). y chnh lvic phn loi gi tin c khnng mrng v m bo bng thng cng nh trxc nh mng li. Mi nt mng trong mng li sc p t cc chnh sch b

bt hoch xp hng khc nhau cho mi gi tin, da trn du m gi tin mang (x ltheo tng chngPHB Per Hop Behavior).


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MPLS kt hp DiffServTrong kin trc MPLS v DiffServ, cc gi tin c nh du vi DSCP si

vo mng MPLS v phng thc PHB l p t bi mi LSR dc theo ng dngi tin. Khi cc LSR khngbit cht no vheader IP, phng thc PHB t c

bng cch xem xt cc thng tin khc. C hai cch tip cn thng c s dng nh du lu lng qua mng MPLS trong vn x l QoS. Trong phng thcth nht, thng tin m DiffServ c nh x vo trng EXP ca header chnMPLS. Trng ny chophp nh du ln n 8 loi cht lng dch v so vi 64i vi trng DSCP trong gi tin IP. Vic qun l cc gi tin (PHB) ti mi chngtrong mng MPLS c lm da trn trng EXP. Cc ng dn chuyn mchnhn LSP m s dng cch tip cn ny c gi l E-LSP, thng tin QoSc ly ra t cc bit EXP. Mt cch khc, mi nhn lin quan vi mt gi tinMPLS Mang mt phn ca du DiffServ m xc nh gi tin sc xp hng nhth no. Phn u tin b bt ca du DiffServ c Mangcc bit EXP (nu headerchn MPLS c dng) hoc trn trng no dng cho mc ch ny ca cngngh lp di (bit CLP mng ATM hay bit DE trn mng Frame Relay). Bnhtuyn LSRu vo sxem xt cc bit DSCP trong header IP (tng tnh cc bitCLP/DE trong mng ATM/Frame Relay) v la chn mt ng dn LSP m c cung cp cho mc cht lng dch vQoS . Ti bnh tuyn u ra, nhnl c bi gi tin vi cc bit DSCP nh ban u c gi n chng IP tip theo.Cc ng dn chuyn mch nhn LSP s dng cc tip cn ny gi l cc ngdn L-LSP, thng tin v cht lngdch v c suy ra mt phn t nhnMPLS. TE khng phn bit cc loi lu lng. mang lu lng d liu v thoitrn cng mt mng, c th cn phi tnh ring mc lu lng thoi c truyntrn mng dung cp nhng m bo kht khe hn v cht lng dch v.

Thit klu lng TE nhn bit v DiffServ (DS-TE)DS-TE khng ch cho php vic cu hnh trn vng global cho vic tnh n

bng thng m cn cho php cu hnh trn vng ph (sub-pool) hn ch m c ths dng cho lu lng mng c mc phn cp cao hn nh thoi hoc cc ngdng khc. Bng thng cn d c trn vng global v vng ph hn ch l cqung co bi IGP LSA hoc TLV, m bo rng bnh tuyn LSR c c thngtin vbng thng cn d khi chp nhn cc ng dnLSP mi cho thoi hoc cclu lng phn cp cao. Vi cch thc ny, cc nh cung cp dch v, ph thuc vmc SLA c th la chn t trc nhnh hn cht cc lp phn cp thp

hoc thm ch t trc thp hn lu lng c u tin cao hn tng thchvi cc yu cu v cht lng dch v. DiffServ-TE tng cng cho MPLS thchin nh tuyn c rng buc (tnh ton ng dn) trn mt tp xc nh (hn ch)cc vng ph m bng thng c dnh ring cho lu lng c phn cpcao. Khnng ny tha mn nhiu hn rng buc vbng thng hn ch s chuynthnh khnng t c cht lng dch vcao hn (v kha cnh tr, jitter hocmt gi tin) cho lu lng s dng vng ph.


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DS-TE lin quan n vic mrng OSPF v IS-IS bng thng cn d trnvng ph ti mi mc u tin l c qung co km thm vi bng thng vngglobal ti mi mc u tin. Hn na, DS-TE thay i vic nh tuyn c rng

buc tnh n cc thng tin cn qung co phc tp hn, trong qu trnh tnh tonng dn. Vic s dng c trng vi DS-TE l cho cc dch v m phng ng

knh thu ring hoc ng trc cho toll bypass/thoi, khi m kt ni imimm bo tha mn cc iu kin bin ca jitter v tr/bng thng.

3. PHNG N KT NI, QUN L3.1. Phng n kt niMng truy nhp ca Metro Ethernetc th xy dng vi topology hnh cy,

vng, li hoc lai ghp hn hp. Mng c khnng hi phc trong trng hp cs c v tuyn cp, nt chuyn mch nhm m bo cht lng dch v. Mi mngtruy nhp c xy dng c th tri rng trn a bn mt s huyn hoc mt squn ti trung tm, mt s khu cng nghip ph thuc vo cc s liu d bo v

tc pht trin thu bao. Mng li ca Metro Ethernet c th thit k trn c smng vng ring hoc mng li nhm m bo khnng d phng ca mng litrong trng hp c s c. Tc chuyn mch ti cc nt mng li ln n hngchc Gbps v lu lng chuyn trn cc tuyn kt ni ca mng li c tht nhng chc Gbps. Cc nt mng li c t ti cc im trung tm lu lng,thng cc a im tp trung dn c v khu cng nghip.

Hnh 3.6: M hnh kt ni mng MAN-E vi mng ng trc

Hnh 3.6 minh ha vphng n kt ni gia cc mng Metro Ethernet ca mitnh vi h thng mng trc trn cnc. Phn phi trn ca mn hnhIP/MPLS

backbone, th hin mng trc c vai tr cho vic kt ni gia cc mng MetroEthernet ti mi Vin thng tnh. Phn pha di ca hnh m t m hnh mngMetro Ethernet ca mi tnh.


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i vi cc loi dch vnh truy cp Internet, mng Metro Ethernet ti mi tnhs cung cp mt s tuyn kt ni BRAS phc v vic truy cp.

i vi cc loi dch vnh VLAN phc vtrao i d liu m cc khch hngnm phn tn trn cc tnh khc nhau, hoc cc dch v VoD, IPTV, mng MetroEthernet cung cp cc kt ni n thit b PE (Provider Edge).

3.2. Phng n qun l mngMi tnh sc trang b mt h thng qun l v c mt b phn k thut

qun l vi vai tr qun l cu hnh thit b, li cho cc h thng thit b m tnhc u t.

Vic thit lp cc dch vchung nh IPTV, VoD hoc cc dch vnh VLANlin quan n cc khch hng thuc tnh s do b phn qun l ca tnh m nhim.

Ton b mng cn n mt b phn qun l chung trn ton mng. B phn nyc nhim v gii quyt cc vn k thut chung cho ton mng hoc c th h tr

cho cc b phn k thut di vin thng tnh. i vi cc dch v phn b trirng trn ton quc cn c s phi hp gia b phn k thut trung tm v cc bphn k thut ti cc n v tnh.

Gii php qun l mng p ng c cc tnh nng c bn sau:

dng to cc kt ni lp 2,VPN lp 2 bng cc giao din ha thun tin. Chc nng ny cng cho php tocc chnh sch bo mt hay cht lng dch v QoS.

dng to cc kt ni lp 3,VPN lp 3 bng cc giao din ha thun tin. Chc nng ny cng cho php to

cc chnh sch bo mthay cht lng dch v QoS.thng trao i vi cc thit b mng to v

thay i cc tuyn TE vi cc tnh nng cao cp. Thng thng cc tnh ton phctp ny phi lm bi cc nh thit k tuyn, sau np d liu v cu hnh thit b.Module ny c cc thut ton rt phc tp h trnh khai thc to kt ni, c bov, cht lng dch v.

c hin cc cng vic tm li khi c s c trnVPN, TE

4. H THNG QUN L IU KHIN MNG MAN-EH thng MAN-E ca VNPT c xy dng trn cng ngh ca hai nh cung

cp l Cisco v Huawei trong khung khc nghin cu, em xin trnh by hthng qun l iu khin mng MAN-EEMS N2000 ca Huawei. H thng baogm cc chc nng sau:


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4.1. Qun l topo mngChc nng ny ca h thng cho php xy dng v qun l topo mng. Ngi

dng c thxem c quan h gia cc thit b trn mng v c mt giao din trcquan cu hnh thit b.

H thng c khnng thng k s lng v thng tin trng thi thit b bngmu sc hin thtrn s .

H thng c th tng pht hin thit b mi c thm vo 1 node mng.

Hnh 3.7: Topo mng MAN-E

4.2. Qun l ti nguynChc nng ny c mc ch thu thp thng tin v thit b trn ton b mng do

h thng qun l qun l, gip ngi dng c th bit thng tin v cc thay i vti nguyn mng: thng tin v slng frame, slot, board, subcard, port trn thit

b.

H thng c khnng sp xp thit b theo hnh cy (resource tree).

Ngi dng c th tm theo tn, kiu, nhm, a ch IP, trng thi.4.3. Qun l liChc nng ny gip gim st mng theo thi gian thc. Cc thit b gi thng

tin cnh bo ln h thng bng giao thc SNMP v1, v2, v3.

H thng c khnng phn tch nguyn nhn gy ra cnh bo, ch ra mc nghim trng ca cnh bo (bng mu sc).


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4.4. Qun l hiunngChc nng ny qun l s vn hnh ca ti nguyn trn mng (cho bit thng s

% CPU, b nh, , slt truy nhp, sphin PPPoE,).Cho php t cc thng s vn hnh gii hn. H thng s gi cnh bo khi

thng s vn hnh vt qu gii hn.Ngoi ra, h thng cn gim st c lu lng mng v thng s SLA: tr,

mt gi tin ICMP, TCP, UDP, SNMP, mt gi tin d liu gia cc node mng, trkt ni,

4.5. Qun l bo mtChc nng ny gip h thng qun l ngi dng, qun l mt khu, nhn thc,

cp quyn cho ngi dng.C th ghi li qu trnh lm vic ca ngi dng.Cho php ngi qun tr buc ngi dng khc phi ng xut khi h thng khi

nhn thy h thng b nguy him. H thng c khnng kha client khng cn

c quyn truy nhp vo h thng.4.6. Qun l cu hnhChc nng ny gip qun l slng frame, board, port, trn thit b.

Cc interface c h thng qun l bao gm: Ethernet, POS, interface o: sub-interface, trunk interface, loopback interface,

Qun l VLAN, Q in Q, ACL, QoS, HqoS,...

4.7. Cu hnh dch v qua giao din hoH thng h trvic cu dch v VPN qua giao din ho :

To tunnel policy To PW To VSI To VRF

4.8. Cu hnh trn thit b mng (cc router NE40E) h thng qun l c cc thng s ca mng trc tin ta phi cu hnh cc

tham s trn thit b mng Cu hnh SNMP trn cc router NE40E . Trong trng hp c t access-list th phi permit cho a ch server

123.29.0.162H thng EMS c trin khai theo m hnh Client - Server My ch ca h

thng t ti cng ty vin thng lin tnh VTN, cc h thng Client c t ti ccVNPT tnh thnh c kt ni vi nhau thng qua kt ni VPN. H thng cgiao cho VTN qun l v phn quyn ty theo chc nng nhim v. Do c thit knh trn l gip cho mng MAN-E ca VNPT c sng b, thng nht gia ccVNPT tnh thnh ph vi mng ng trc ca VTN.


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42

KT LUN

Vic s dng cng ngh Ethernet v Gigabit Ethernet trong mng th to

nn mt gii php mng hu hiu truyn ti thng tin trong cc th, gi l gii

php MAN-E.

Cc cng nghc la chn p dng xy dng MAN ch yu tp trung vo

6 loi cng ngh chnh l:

IP/ATM. WDM. SONET/SDH-NG. Ethernet/Giagabit Ethernet (GbE). RPR. Chuyn mch kt ni MPLS/GMPLS.

Cc cng nghny c xy dng khc nhau c phm vi v cc phng thc

m chng sc s dng. Trong mt s trng hp, cc nh cung cp c sh

tng li trin khai cng mt cng ngh cho cc ng dng khc nhau.

T m hnh trin khai mng Metro Ethernet ti VNPT chng ta thy rng mngMAN-E c nhim v tp trung lu lng rt ln t lp access chuyn ln lp

Core. Vic x l lu lng, p dng chnh sch cht lng dch v, khi to cc

dch vu nng mng MAN-E. V vy h thng mang MAN-E cn m bo c

hiu v tin cy cao.

MAN th h mi c xy dng l t hp ca cc cng ngh truyn dn, cng

ngh chuyn mch/nh tuyn c la chn. Do vy chng ta ch c th la chn

gii php cng ngh xy dng MAN da trn t hp cng ngh truyn dn, chuyn

mch no t c nhng tiu ch c thra trc khi xy dng mng.

xc nh cng ngh no c la chn, trc ht cn phi xc nh c nhng

tiu ch ch yu cho vic xy dng mng. Cc tiu ch ch yu l: Nng lc

truyn ti ca mng, gi thnh ca mng, khnng cung cp v mrng mng.


43/43

TI LIU THAM KHO

1. Nguyn Huy Thnh (2006), Nghin cu la chn cng ngh v gii php xydng mng MAN trn cp quang, lun vn thc s k thut, Hc vin cng ngh

bu chnh vin thng.2. Nguyn Vn Bnh, NGHIN CU CNG NGH MAN-E V NG DNG

TRN MNG VIN THNG PH TH, lun vn thc s k thut, Hc vincng nghbu chnh vin thng.

3. MEF forum (2009), MEF10.2Ethernet Services Attributes Phase 2, The MetroEthernet Forum.

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