1 BI DNG KIN THC V CNG NGH MAN-ETHERNET TNG QUAN V MNG MEN HC VIN CNG NGHBU CHNH VIN THNG H Ni20/10/2008 TS. L Nht Thng E-mail: lenhatthang@gmail.com 2 Gii thiu chung v MEN nh gi v cng ngh mng Metro Ethernet ng dng mng MEN Cc xu hng cng ngh pht trin mng MEN v ng dng Kin trc mng MEN theo Metro Ethernet Forum Kin trc mng MEN ca CISCO Khuyn ngh TR-101 Nguyn tc cu trc mng MEN -VNPT Kt lun Ni dung TNG QUAN V MNG MEN 3 Gii thiu chung v MEN Metropolitan Area Network (MAN) Ethernet MEN MEN thc hin chc nng thu gom lu lng v p ng nhucutruyntilulngchoccthitbmngtruy nhp (IP DSLAM, MSAN). C kh nng cung cp kt ni truy nhp Ethernet (FE/GE) tikhchhngchuyntilulngtrongnitnh, ng thi kt ni ln mng trc IP/MPLS NGN chuyn lu lng i lin tnh, i quc t. TrongmngMEN,ngitasdngccthitbCES (CarrierEthernetSwitch)titrungtmthnhph,trung tmhuynvcckhuvctrngimtothnhmng chuyn ti Ethernet/IP. Kt ni gia cc thit b CES dng hnhsao,ringhocunitip,sdngccloicng kt ni: n x 1Gbps hoc n x 10Gbps. 4 Gii thiu chung v MEN FTTP FTTN Cp ng IP / MPLS Core Next Generation Ethernet Ethernet MSS 3G Mobile Soft-Switch Mng trc IP/MPLS chung cho cc dch v MAN-Ethernet gom lu lng chuyn v core T.Bi MSS cung cp kt ni FR, ATMTruy nhp BR FFTx Softswitch cung cp cc tnh nng thoi OSS / BSS PSTN TG/AG/SG 5 Gii thiu chung v MEN Softswitch Xlbohiuiukhincucgitrongmngchuyn mch gi X l tn hiu gim st trng thi cuc gi iukhinvthchinktniviccthitbcng AG/TG/SG Trao i bo hiu/iu khin vi cc Softswitch khc Signalling Gateway Cung cp kt ni bo hiu gia mng NGN (Softswitch) v PSTN (SS7)6 Gii thiu chung v MEN MSAN/Access Gateway Kt ni vi PSTN qua giao din V5.2 Kt ni vi mng chuyn mch gi MAN-E Nhn tn hiu iu khin t Softswitch Gi ha tn hiu thoi Kt ni trc tip vi thu bao POTS, xDSL, Ethernet Trunk Gateway Cung cp giao din trung k E1 hoc STM gia NGN v PSTN Thit lp kt ni do Softswitch iu khin Gi ha tn hiu thoi Tham gia truyn ti lu lng thoi PSTN vi NGN7 Gii thiu chung v MEN Application Server Cung cp cc ng dng v cc dch v gi tr gia tng (VAS) Cung cp cc dch v contents Cc thit b IP: Routers, Switches, Servers 8 Gii thiu chung v MEN Lp tp trung v truy nhp Gn tag Qun l bng thng Cnh bo li Lp tp trung v truy nhp Ethernet switchDSL, ATM, IP, TDM Devices with Ethernet Uplinks Lp bin Metro Routers/Switches Lp li Ring Ethernet 10Gbs+ Net Mgmt Svc Mgmt Lp li Qun l lu lng Chuyn mch nh tuyn Lp bin Chuyn mch ni b nh tuyn 9 Gii thiu chung v MEN Cc dch v mng cung cp EVC: l mt lin kt gia hai hay nhiu UNI. Hai loi hnh dch v E-Line. E-LAN. 10 Gii thiu chung v MEN Cc dch v mng cung cp E-Line: Kt ni cc thu bao thng qua cc EVC im - im. EVC im - im UNI UNI MEN 11 Gii thiu chung v MEN Cc dch v mng cung cp E-LAN: Kt ni thu bao thng qua cc EVC a im. EVC a im UNI UNI UNI MEN 12 Gii thiu chung v MEN Cc dch v mng cung cp Dch v Metro EthernetDch v gi tr gia tng E-LineTruy nhp Internet Truy nhp trung tm d liu VPN Thoi, D liu E-LANTruy nhp Internet Video 13 Gii thiu chung v MEN Cc tham s nh gi cht lng dch v tr khung: D = A+B+C A, B l tr UNI. C l tr truyn lan d liu qua mng. tr ca dch v l tr ln nht o c. ATimeUNI UNI Metro EthernetNetworkHng truyn khungBit cui Cng ca khung i voBCBt ra u tinGiao din vt l UNI14 Gii thiu chung v MEN Cc tham s nh gi cht lng dch v tri khung ( bin ng tr): L s bin i tr ca mt tp cc khung dch v c xt. tri khung= tr khung tr nh nht trong s cc tr ca cc khung ly mu T l tn tht khung: L t l gia s khung b mt v s khung c truyn trong khong thi gian ly mu. L l t l tn tht khung. a l s khung c chuyn n ch thnh cng. b l tng s khung c gi t ngun. 100 1 ((

=baL15 Gii thiu chung v MEN Qun l mng MEN Yu cu cc giao thc vn hnh, qun l v bo dng mng mi: Mng th bao gm mng ca nhiu nh cung cp dch v khc nhau, phc v mt s lng ln khch hng. Cc giao thc hin thi hot ng trn c s point-to-point Cc giao thc qun l chun a ra: 802.3ah - OAM dch v. 802.1ag - OAM lin kt. Giao din qun l ni b ca Ethernet (E-LMI). 16 Gii thiu chung v MEN Qun l mng MEN 802.3ah - OAM dch v: Thc hin qun l cc EVC. Nhn bit EVC sn sng hot ng. Nhn bit v nh tuyn li trnh ch li. Ch ra nhng khch hng b nh hng. Hot ng theo m hnh cc phm vi qun l phn cp 17 Gii thiu chung v MEN Qun l mng MEN CEMng truy nhpMng liMng truy nhpCEKhch hngNh cung cp dch vKhch hngMng ca khch hngMng ca nh cung cpMng nh vn hnhMng nh vn hnhMng nh vn hnhOAM dch vOAM kt ni802.3ah Hot ng 18 Gii thiu chung v MEN Qun l mng MEN 802.1ag:Kimtravxlsccamtktnivtl Ethernet n gin. E-LMI:chophpccCEtcuhnhtrncstraoi cc thng tin v trng thi ca EVC, thuc tnh dch v. 19 nh gi v cng nghmng Metro Ethernet Tnh d s dng DchvEthernetdatrngiaodinEthernetchun,dngrngritrong cc h thng mng cc b. HunhttcccthitbvmychtrongLANuktnidng Ethernet. Vic m rng s dng Ethernet kt ni cc mng cung cp dch v vi nhau s n gin ha qu trnh hot ng v cc chc nng qun tr, qun l v cung cp (OAM &P). Hiu qu v chi ph DchvEthernetlmgimchiphut(CAPEXgim39%vs.mng SDH v chi ph vn hnh (OPEX gim 49% vs. mng SDH). S ph bin ca Ethernet trong hu ht tt c cc sn phm mng nn giao din Ethernet c chi ph khng t. Gi thnh thit b thp, chi ph qun tr v vn hnh thp hn, t tn km hn nhng dch v cnh tranh khc.20 nh gi v cng nghmng Metro Ethernet Tnh linh hot DchvEthernetchophpnhngthubaothitlpmngcah theo nhng cch hoc l phc tp hn hoc l khng th thc hin vi cc dch v truyn thng khc. Vi dch v Ethenet, cc thu bao cng c th thm vo hoc thay ibngthngtrongviphtthayvtrongvingyngyhoc thmchvitunsovinhngdchvmngtruynhpkhc (Frame Relay, ATM) m khng i hi phi mua mi thit b hay cn b n kim tra, h tr.Tnh chun ha MetroEthernetForumangtiptcnhnghavchunhacc loidchvvccthuctnhcan,chophpccnhcungcp dch v c kh nng trao i gii php ca h mt cch r rng, cc thu bao c th hiu v so snh cc dch v mt cch tt hn.21 ng dng mng MEN Kt ni gia cc LAN Truyn ti a ng dng Mng ring o Metro Kt ni im - im tc cao Mng lu tr LAN Video/Video Training CAD/CAM Cc ng dng sao lu d phng Truyn s liu Y t Hnh nh 22 ng dng mng MEN Scientific Modeling Streaming Media Server Backup Cc ng dng Back-end Server Cc ng dng lu tr (iSCSI) 23 Cc xu hng cng ngh pht trin mng MEN v ng dngCng ngh truyn ti s dng MPLS Cung cp kt ni ng trc tin cy trn c s cng ngh chn mui,cungcpthnhcngccdchvimim,aimv phn tch vng qun tr. MPLS v ang c a s cc nh cung cp thit b h tr. CngnghtruyntisdngT-MPLS(Transport-MPLS/ ITU G.8110) Alcatel Lucent xng v ng vai tr pht trin ch o. LcbmtstnhnngiukhincaMPLSnginha hot ng chuyn mch, nhng vn k tha nhng immnh ca MPLS. Cng ngh ny ln u tin kim th cng khai vi 5 nh cung cp v thit lp thnh cng dch v im im (do EANTC tin hnh kim th nm 2006). Hin c chun ha mt s chun c bn. 24 Cc xu hng cng ngh pht trin mng MEN v ng dngCngnghPBB-TE(802.1QayProviderBackbone Bridging Traffic Engineering) Nortel xut. SdngcctnhnngcbncaEthernet,cngvicccitinv iu khin lu lng, qun l OAM, theo di hiu nng c th s dngctrongmitrngmngcungcpdchvvnihi nghim ngt v cht lng dch v. Hin c chun ha OAM v mt s chun truyn ti.Xu hng dch v tc cao McchchyucamngMENlcungcphtngmbocho ccdchvyucubngthngln,tccao,mmdotrongqun l. Vikhnngbngthngccpphtt1Mbps-10Gps,Ethernet cho php ngi dng ti u ha ngun lc trong vic pht trin mng ca ring mnh.25 Cc xu hng cng ngh pht trin mng MEN v ng dngMt s dch v cn tc cao Truy nhp Internet tc cao Mng lu tr Cc mng ring o lp 2 (L2VPN) Cc dch v gi tr gia tng Dch v LAN trong sut VoIP H tng ng trc mng th LAN - FR/ATM VPN Extranet LAN kt ni n cc ti nguyn mng26 Cc xu hng cng ngh pht trin mng MEN v ng dngXu hng pht trin cng ngh MEN27 Kin trc mng MEN theoMetro Ethernet Forum Theo MEF 4, mng MEN c xy dng theo 3 lp Lp truyn ti dch v Lp dch v Ethernet Lp dch v ng dng Milpmngcthitktheoccmtphngiukhin,d liu, qun tr 28 Kin trc mng MEN theoMetro Ethernet Forum M hnh mng theo cc lp 29 Kin trc mng MEN theoMetro Ethernet Forum Lp truyn ti dch v H tr kt ni gia cc phn t ca lp dch v Ethernet. Sdngnhiucngnghkhcnhauthchinvichtrktni: IEEE 802.1, SONET/SDH, ATM VC, OTN ODUK, PDH DS1/E1, MPLS LSP Cccngnghtruyntitrn,nltmnhlicthdonhiucng nghkhchtr,ctiptcnhvychonlpvtlnhcpquang, cp ng, khng dy.Lp dch v Ethernet (ETH layer) Lpdch v Ethernetcchcnng truynticc dchv hng kt ni chuyn mch da trn a ch MAC. Cc bn tin Ethernet s c truyn qua h thng thng qua cc giao din hng ni b, hng bn ngoi c quy nh r rng, gn vi cc im tham chiu. 30 Kin trc mng MEN theoMetro Ethernet Forum Lp dch v Ethernet (ETH layer) (tt) LpETHcngphicungcpccckhnngvOAM,kh nngphttrindchvtrongvicqunlccdchvEthernet hng kt ni. TiccgiaodinhngbnngoicalpETH,ccbntinbao gm:Ethernetunicast,multicasthocbroadcast,tuntheochun IEEE 802.3 2002. Lp dch v ng dng Htrccdchvsdngtruynti trnnnmngEthernetca mng MEN. CnhiudchvtrongbaogmcccvicsdnglpETH nh mt lp TRAN cho cc lp khc nh: IP, MPLS, PDH DS1/E1 31 Kin trc mng MEN theoMetro Ethernet Forum Ccimthamchiu:ccimtiphntchbin qun l khi kt ni i qua cc giao din trong MEN. ThubaoktniviMENquagiaodinUNI(User-Network Interface). Cc thnh phn bn trong MEN kt ni vi nhau qua giao din NNI trong (Internal Network-Network Interface). Hai mng MEN kt ni vi nhau qua giao din NNI ngoi (External Network-Network Interface).

32 Kin trc mng MEN theoMetro Ethernet Forum Service Interworking NNI Network Interworking NNI Network Interworking NNI Subscriber UNI Other L1Transport Networks(e.g., SONET, SDH, OTN) MENService Provider Z1 Other L2/L2+ Services Networks (e.g., ATM, FR, IP) External NNI EthernetWide Area Network (E-WAN)Service Provider Y MENService Provider Z2 MEN Service Provider X Metro Ethernet Network(MEN) Service Provider X External NNI Subscriber Subscriber UNI UNI M hnh cc im tham chiu33 Kin trc mng MEN ca CISCO Theo CISCO, kin trc mng MEN c chia thnh 5 lp Lp truy nhp - Access Lp thu gom - Aggregation Lp bin - Edge Lp mng li- Core Lp thu gom dch v - Service Application 34 Kin trc mng MEN ca CISCO Kin trc mng MEN theo nh ngha ca CISCO35 Kin trc mng MEN ca CISCO Lp truy nhp Cung cp truy nhp bng rng cho cc dch v doanh nghip v dn c trong m hnh retail v wholesale, da trn DSL (ADSL, ADSL 2+, VDSL), cc nt truy cp Ethernet ghp lu lng thu bao trong 802.1q v 802.1ad. ThitbvichcnngU-PE-imphntchgiakhchhng vmngnhcungcpdchvlthitblp2ttilptruy nhp ti CP, nhng c qun l bi nh cung cp dch v. Cc chc nng ca U-PE Tng hp nhiu ng khch hng ti lp truy nhp.nh ngha cc dch v Ethernet bng cch cung cp c im UNI ph hp, v d 802.1Q tunneling (Q-in-Q) v 802.1Q trunking. ClplulngkhchhngbngcchgngitrVLANIDsduynht ca nh cung cp mi dch v. m bo bng thng ph hp SLA bng cch phn loi lu lng, p t chnh sch, nh du v xp hng. 36 Kin trc mng MEN ca CISCO Lp thu gom Cung cp dch v vn chuyn gia lp mng truy cp v lp mng bin, bao gm c cc nt phn phi v tng hp kt ni trong topo vt l khc nhau. CngnghCarrierEthernetmngtnghpdatrnMPLS/IPvcho php cc ty chn vn chuyn L2 v L3 ( P2P v MP) da trn cc yu cu dch v c bit. ThitbchoAggregation-PE-AGG:tnghplulng,qunltc nghn, ghp dch v, chuyn mch cc b cho cc dch v Ethernet. Lp bin Ghp lu lng v qun l tc nghn: lin quan n QoS nh phn lp, thit lp chnh sch, nh du v xp hng, nh x bit 802.1p. Giao din kt ni s dng cp quang hoc cp ng. Cc dch v mng MEN c bt u nh ngha ti y.37 Kin trc mng MEN ca CISCO Lp mng li Chuyntipgitinnhanh(IP/MPLS),qunltcnghnvk thut iu khin lu lng phc tp, giao din quang tc cao, s hi t ca x l gi tin v cng ngh quang, cng ngh ATM.Lp thu gom dch v cung cp Cc giao din quang mt cao Chuyn mch tc cao Qun l tc nghn v lu lng phc tp CngdchvIPvMPLS:lpnhnghadchvVPLSv VPWS,cnglinktlmvicdchvL2VPN,lpdchv L3VPN Thit b ng dng dch v lp 3: dch v ni dung, Firewall, pht hin xm nhp

38 Khuyn ngh TR-101 Tng quan v TR-101 Hin nay, mng xDSL ca cc nh khai thc ti Vit Nam ch yu da trn kin trc ATM.Ccmngnycphttrincchyvinmtheo khuynnghTR-059vTR-025cadinnDSL,tuy pngcnhucusdngInternettccao nhng dn l r nhng nhc im cn khc phc.DinnDSLarakhuynnghTR-101vvic chuynmngxDSLtkintrcdatrn ATMsangkin trc da trn Ethernet.TR-101 nh hng pht trin cho mng truy cp DSL htrcccngnghADSL2+vVDSL,QoS,IP Multicast bng cch tn dng cc li im do cng ngh Metro Ethernet mang li. 39 Khuyn ngh TR-101 Tng quan v TR-101 Trongthigianspti,VNPTsthchinuttp trung trn din rng h thng mng MEN ti cc tnh. VicnghincuvhiurnhngkhuynnghcaTR-101 l rt cn thit cho vic vn hnh v qun tr h thng mng,vtndngctianhnguimmh thng mng Metro Ethernet em li. TR-101baogmnhngkhuynnghvirtnhiuthnh phn.Tronggiihncachngtrnhny,chcp nnhngvnchungnhtvTR-101vmtsvn p dng trong mng vin thng ca VNPT.40 Khuyn ngh TR-101 Tng quan v TR-101 NidungchnhcaTR-101baogmnhngphnsau y: Phn1:GiithiukhinimtngquanvmhnhTR-101 khuyn ngh tun theo. Phn 2: Cc khuyn ngh cho Access node. Phn 3: Cc khuyn ngh cho Ethernet Aggregation node. Phn 4: Cc khuyn ngh cho BNG (BROADBAND NETWORK GATEWAY). Phn 5: Cc vn v Multicast. Phn 6: Cc vn v OAM. Phn 7: Cc vn trong qun tr mng.41 Khuyn ngh TR-101 ATM v nhng vn lin quan Mng DSL hin nay da trn m hnh tham chiu TR-025 hay mi hn l da trn TR-059.C hai m hnh ny u dng ATM thu gom cc mng truy cp vo mng ca nh cung cp dch v bng thng rng khu vc.TrongTR-025,BRASctmngbngrngkhu vchocnhcungcpdchvvinhimvchnhl kt cui PPP (PPP termination). TrongTR-059,BRASctmngbngrngkhu vc,nhngcmrngthmsoviTR-025cc chcnngqunlthubao,qunlchtlngdchv QoS, qun l lu lng nng cao.42 Khuyn ngh TR-101 M hnh tham chiu TR-101 TrongTR-101,khinimcngmngbngrngBNG (BroadbandNetworkGateway)baogmcchcnng BRAS c m t trong TR-092 v cc chc nng khc, nhtlkhicsdnglmbnhtuynngoibin (Edge Router) c a ra. MngthugomcnhnghatrongTR-101lphn mng kt ni t Access Node n BNG (BRAS trong TR-025 hay TR-059).Trong TR-025 v TR-059, mng kt tp u da trn nn tng ATM; cn trong TR-101 mng kt tp l Ethernet. 43 Khuyn ngh TR-101 M hnh tham chiu TR-101 4 thnh phn c bn: 1) RG for home gateway 2) Access Node3) Ethernet Aggregation Equipments 4) BB network gateway namely BRAS Hai giao din: 1) U interface Gia AN v RG 2) V interface Gia AN and EA Mng Bng rng Mng truy nhp Access Node (DSLAM) Access Loop MDF Ethernet AggregationIP BB Network Gateway L2TS IP -QoS L2TP Mng khch hng CPE NSP 1 ASP 1 A10- ASP A10- NSP U User 1 User 2 T NID NSP 2 A10- NSP IP -QoS A10- ASP V ASP/BBNetworkGateway Mng thu gom 44 Khuyn ngh TR-101 M hnh tham chiu TR-101 GiaodinVsdngEthernetlmgiaothctruynti, khng s dng ATM. Mng thu gom l Ethernet. H tr s dng hai hay nhiu BNG. Cung cp dch v tc cao hn. Tnh kh dng cao hn (high availability). GiaodinUcthhtrkhungEthernettrctiptrn DSL.45 Khuyn ngh TR-101 Giao din U Ty chn a n d c m t trong TR-043. Ty chn a: IPoEoATM. Ty chn b: PPPoEoATM. Ty chn c: IPoATM. Ty chn d: PPPoATM. Tychne,fcsdngtrongtrnghphtr khung Ethernet trc tip v c gi l IPoE hay PPPoE. 46 Khuyn ngh TR-101 Giao din U Ngn xp giao din U47 Khuyn ngh TR-101 Access Node Access node l im thu gom u tin ca mng truy cp DSL, c kh nng: Kt ni vi lp ATM. C giao din Ethernet hng ln (uplink). Khi cung cp ATM giao din U, access node c chc nng kt nigiaATMphangidng vEthernetphamng,cung cpchuynigiaothc,xcnhmchvngtruycp(access loop),chtlngdchv(QoS),anninh(security),botr,bo dng, qun l (OAM). H tr Native Ethernet framing. H tr Multicast. H tr tch bit ngi dng (user isolation)48 Khuyn ngh TR-101 Access Node Chc nng kt ni ATM-Ethernet49 Khuyn ngh TR-101 Giao din V Giao din V cung cp cc chc nng sau: Thu gom lu lng. Phn bit lp cc dch v (class of service). Ngn cch (isolation) v d vt (traceability) ngi dng.V mng kt tp l Ethernet nn c Access Node v BNG u trang b giao din Ethenet giao din V l Ethernet.CchphntchccmngEthernetthnhccmng LANo(VLAN)sdnggiaothc802.1qvcb sung trong 802.1ad.Cc th VLAN (VLAN tag) cho php nhm cc lu lng cchungtnhcht,mcdchvthnhmtVLANc VID=x,ccnhmlulngkhcthnhmtVLANc VID=y. 50 Khuyn ngh TR-101 Giao din V Nh vy chng ta nh du c lp cc dch v nh s dng trng u tin gm 3 bit (3-bit priority) v do phn bit c cc dch v ny. Ngoira,giaodinVcnchophplng2thVLAN (doubletagging)cungcpmtthp16triu(224) VLAN khc nhau. Giao din U c th cung cp th VLAN gi l C-VLAN tag bn trong (inner tag). Giao din V cung cpthVLANgilS-VLANtagbaobnngoi(outer tag). 51 Khuyn ngh TR-101 Giao din V Ngn xp giao din V52 Khuyn ngh TR-101 Mng thu gom Ethernet CcmngkttpEthernetcnphicungcpcctnh nngm mngdatrnATMcungcp,ngoiran cn cung cp cc tnh nng khc: H tr u tin lu lng (prioritize traffic) iu kin nghn. H tr Multicast. Cung cp tnh nng kh dng cao. H tr kt ni 802.1ad. Ngn tch ngi dng. Mng thu gom phi h tr cc mng truy cp trin khai vmngMetroEthernet.ngthiphihtrcctnh nng multicast. 53 Khuyn ngh TR-101 Mng thu gom Ethernet Mt s m hnh mng thu gom Ethernet54 Khuyn ngh TR-101 BNG CnckhnngktcuilpEthernetvccgiaothc tng ng. Cn b sung cc tnh nng tng ng vi tnh nng trn AccessNodenhxcnhmchvng,chtlngdch v trn Ethernet, an ninh v tnh nng bo tr, bo dng, qun tr OAM. KintrcTR-101htrdnghaiBNGsongsong(dual BNG node). Theo kin trc ny th c hai BNG khng cn phihtrtonbtnhnngmchcn1BNGhtr, BNG cn li v d dng lm BNG cho video khng cn ci t tnh nng qun l thu bao (kt cui PPP, cht lng dch v tng user per user QoS) nh BNG kia. 55 Khuyn ngh TR-101 Kin trc Multicast Mt trong nhng ng lc chnh chuyn sang kin trc mng kt tp Ethernet l kh nng cung cp dch v hnh nh (broadcast ln unicast).Cc tnh nng h tr multicast trong khuyn ngh TR-101 bao gm: S dng lp 2 hu hiu thng qua c ch VLAN N:1. H tr IGMP phin bn 2 v 3. H tr m hnh ASM v SSM. H tr nhiu im truy xut ni dung. H tr multicast-VLAN trong mng truy nhp. IP (v cIGMP) c ng gi trc tip bng khung Ethernet. Cng ngi s dng (user port) c th thuc nhiu VLAN. 56 Nguyn tc cu trc mngMEN - VNPT H thng mng MEN c VNPT xy dng vi mc tiu: XydngcutrcmngMENvtrinkhaimngtruynhp quang, chun b tt h tng sn sng cung cp cc dch v bng rng, dch v tc cao. DunglngmngMENcxydngpngnhucud bophttrinccdchv:Internet,truynsliu,dchvbng rng v dch v thoi. 57 Nguyn tc cu trc mngMEN - VNPT CutrcmngMENvtruynhpquangtimitnh, thnh gm cc phn sau: MngMENlmchcnngthugomlulngcaccthitb mngtruynhp(MSAN/IP-DSLAM),lulngcckhchhng kt ni trc tip vo mng MEN chuyn ti lu lng trong ni tnh,ngthiktnilnmngtrcIP/MPLSNGNcaVNPT chuyn lu lng i lin tnh, i quc t . H thng mng cp quang truy nhp, c s dng kt ni cc thitbmngMENvcungcpcpquangtruynhpncc building, khu cng nghip, khu ch xut, cc khch hng ln. 58 Nguyn tc cu trc mngMEN -VNPT Mng MEN c t chc thnh 2 lp: Lp trc - ring core Lp truy nhp - access Lp trc (ring core): Bao gm cc CES c ln lp t ti cc trung tm ln nht ca tnh, vi s lng hn ch (ti a t 2 n 3 im), v tr lp t cc CES core ti im thu gom truyn dn v dung lng chung chuyn qua cao. Cc thit b ny c kt ni ring vi nhau bng mt isicpquangtrctip,sdnggiaodinktni Ethernet cng 1Gbps hoc 10Gbps. 59 Nguyn tc cu trc mngMEN - VNPT mbomnghotngnnhcao,ktnit mngMENtimngtrcIP/MPLSNGNsthngqua2 thitbcoreCEScamngMEN(dphngvphn ti lu lng), kt ni nh sau: Ti tnh, thnh ph chc nng BRAS v PE tch hp trn cng mt thit b th mi thit b core CES s kt ni ti BRAS/PE. Titnh,thnhphchcnngBRASvPEctchring ththitbcoreCESsc2ktnisdnggiaodin Ethernet,trongmtktnitiBRAS(cungcpdchv truy nhp Internet tc cao), mt kt ni ti PE ( cung cp cc dchvkhc,nh:thoi,Multimedia(VoD,IP/TV,IP conferencing). 60 Nguyn tc cu trc mngMEN - VNPT LptruynhpMEN(access):BaogmccCESlpt ticctrmVinthng,ktnivinhauvktniti ring core bng mt i cp quang trc tip. Ty theo iu kin, lp truy nhp c th s dng kt ni dng hnh sao, ring (trong mt ring ti a t 4 - 6 thit b CES), hoc u ni tip nhau (ti a u ni tip t 4 - 6 thit b CES), v trlptccCEStruynhpthngtticcim thuntinchovicthugomtruyndnktnincc thit b truy nhp (nh MSAN/IP-DSLAM). Cc thit b truy nhp (MSAN, IP DSLAM) dng giao din Ethernet(FE/GE)scktninccthitbmng truynhpMANE(CES)chuyntilulngtrong tnh, thnh ph v chuyn lu lng ln lp trn. 61 Nguyn tc cu trc mngMEN - VNPT Thit b MEN c th cung cp cc kt ni FE/GE trc tip ti khch hng. SdngthitbMSAN+cpquangnhmrtngn khong cch cp ng dng cho cc khu vc c nhu cu cungcpdchvthoi,kthpccdchvbngrng. Trongtrnghpcungcpdchvthoisktnivi cc tng i Host hin c bng giao din V5.2. m bo an ton cho phn lp truy nhp th cc vng ring access hoc cc kt ni star c kt ni ti 2 node core. Tuy nhin vic trin khai nh vy c th khng kh thitronggiaionhinnaykhitichngtakhngc si cp quang cho kt ni.62 Nguyn tc cu trc mngMEN - VNPT Nh vy trong cu trc mng MEN ca cc n v s xy dng 2 cu trc mng nh sau: Cu hnh qu : khi khng c si quang cho cc kt nivcctuyncpquangchactrinkhaicha y . Cu hnh ny s c thay i ti cu hnh mc tiu khi c y si quang. Cu hnh mc tiu: khi cc n v trin khai lp t sn cctuyncpquangchoccktnithxydngcu hnh mc tiu theo cc nguyn tc trn. Cu hnh ny c uimlclunmboantonmngcaotrong trng hp xy ra s c hng node hoc t cp quang trn tuyn. 63 Nguyn tc cu trc mngMEN - VNPT IP/MPLS BackBoneCESCESCESCESCESCESCESCESCESCESCESH thng qun lCES CESRing accessRing accessRing access CESCESCES..km..km..km..km..km..km..km..km..km..km..km..km..km..km..km..kmBRASPEDch v MegaVNNDch v Thoi, Multimedia, Mega WANNG-SDH..km..km..km..kmRing core..kmCu hnh qu mng MEN 64 Nguyn tc cu trc mngMEN - VNPT IP/MPLS BackBoneCESCESCESCESCESCESCESCESCESCESH thng qun lCESCESRing accessRing accessRing access CESCESCES..km..km..km..km..km..km..km..km..km..km..km..km..km..km..km..km..kmBRASPEDch v MegaVNNDch v Thoi, Multimedia, Mega WANNG-SDH..km..km..km..km..km Ring core..km..km..km..kmCu hnh mc tiu mng MEN 65 Nguyn tc cu trc mngMEN - VNPT CcthitbthugomlulngtrongmngMANgil CES, c kt ni vi nhau bng i si quang trc tip. Vidunglngyucut2ktni10Gbpstrlnth ccthitbCESnysktnivinhauquathitb truyn dn C/DWDM ghp bc sng. Vi dung lng yu cu t 2.5 Gbps tr ln s dng kt ni10Gbpsgiaccthitb,nu>2Gbpsv