Metronet MAN

8/8/2019 Metronet MAN

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Metronet - MANP.KTNV - EHTC

04-2006


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1. GII THIU

Mng th h sau (NGN-Next GenerationNetwork) l mng da trn:

cng ngh chuyn mnh gi c kh nng cung cp a dch v

bng rng

cho php qun l cht lng dch v (QoS).


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1. GII THIU

nh ngha theo ITU-T Study Group 13:NGN cung cp cho ngi dng kh nng

truy cp khng hn ch cc dch v chu tuyn ln v tuyn trn mt nn tngcng ngh chung

NGN l mt cch tip cn hng dch v(service driven approach) cho s phttrin ca mng vin thng tin hc.


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1. GII THIU

Metro Ethernet Forum (MEF), mt t chccc nh cng nghip trong lnh vc ICT c

v vic cung cp h tng mng Metro sdng cng ngh Ethernet.


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2. LI CH DNG DCH V ETHERNET

Nhiu nh cung cp dch v cung cpdch v Metro Ethernet.

Mt s nh cung cp m rng dch vEthernet vt xa phm vi mng ni th(MAN) v vun n phm vi mng dinrng (WAN)

Hng ngn thu bao c s dngdch v Ethernet v s lng thu baoang tng ln mt cch nhanh chng.


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Li ch ca dch v Ethernet em li, baogm:

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

Linh hot.


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Tnh d s dng:

Dch v Ethernet da trn mt giao dinEthernet (Ethernet interface) chun.

Ph bin dng rng ri trong cc h thng mngcc b (LAN).

Hu nh tt c cc thit b v my ch trongLAN u kt ni dng Ethernet, v vy vic s

dng Ethernet kt ni vi nhau s n ginha qu trnh hot ng v cc chc nng quntr, 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 ph vn hnh(OPEX-operation expense):

Mt l, do s ph bin ca Ethernet trong hu ht ttc cc sn phm mng nn giao din Ethernet c chiph khng t.

Hai l, t tn km hn nhng dch v cnh tranh khcdo gi thnh thit b thp, chi ph qun tr v vn hnhthp hn.

Ba l, nhiu nh cung cp dch v Ethernet cho phpnhng thu bao tng thm bng thng mt cch khmm do.. iu ny cho php thu bao thm bngthng khi cn thit v h ch tr cho nhng g h cn.


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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 ccdch v truyn thng khc. V d: mt cng ty thu mt giao tip Ethernet

n c th kt ni nhiu mng v tr khc nhau

thnh lp mt Intranet VPN ca h, kt ninhng i tc kinh doanh thnh Extranet VPNhoc kt ni Internet tc cao n ISP.


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Tnh linh hot

Vi dch v Ethenet, cc thu bao cng c ththm vo hoc thay i bng thng trong vi

pht thay v trong vi ngy ngy hoc thm chvi tun khi s dng nhng dch v mng truynhp khc (Frame relay, ATM,).

Ngoi ra, nhng thay i ny khng i hi thubao phi mua thit b mi hay ISP c cn b kthut n kim tra, h tr ti ch.


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3. M HNH DCH V ETHERNET

Tt c cc dch v Ethernet s c mt vi thuctnh chung, nhng dch v khc nhau s khcnhau v mt s cc thuc tnh.

Dch v Ethernet c cung cp bi mngMetro Ethernet Network (MEN) ca nh cungcp.

Thit b khch hng CE (Customer Equipment)

gn vo mng MEN qua giao tip ngi sdng-mng UNI (User-Network Interface) sdng chun giao din Ethernet chun vi tc 10Mbit/s, 100Mbit/s, 1Gbit/s hoc 10Gbit/s.


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C th c nhiu UNIs kt ni n MEN tmt v tr.

Nhng dch v c xc nh theo quanim ca thu bao. Nhng dch v nydng cc cng ngh truyn dn hay ccgiao thc MEN khc nhau nh SONET,

DWDM, MPLS, GFP, Tuy nhin, digc thu bao, kt ni mng v phathu bao ca giao din UNI l Ethernet.


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Kt ni Ethernet o (EVC-Ethernet VirtualConnection):

L mt thuc tnh c bn ca dch vEthernet.

EVC c nh ngha bi MEF l mt skt hp ca hai hay nhiu UNIs, trong

UNI l mt giao din Ethernet, l imranh gii gia thit b khch hng vmng MEN ca nh cung cp dch v.


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EVC thc hin 2 chc nng: Kt ni hai hay nhiu v tr thu bao (chnh xc l

UNIs), cho php truyn cc frame Ethernet giachng.

Ngn chn d liu truyn gia nhng v tr thu bao

(UNI) khng cng EVC tng t. Kh nng ny chophp EVC cung cp tnh ring t v s bo mttng t Permanent Virtual Circuit (PVC) ca FrameRelay hay ATM.


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Hai quy tc c bn chi phi, iu khin victruyn cc Ethernet frame trn EVC:

Th nht, cc Ethernet frame i vo MEN khng baogi c quay tr li UNI m n xut pht. Th hai, cc a chMAC trong Ethernet frame gi

nguyn khng thay i t ngun n ch. Ngc livi mng nh tuyn (routed network), cc tiu

(header) Ethernet frame b thay i khi qua router.Da trn nhng c im ny, EVC c th c sdng xy dng mng ring o lp 2 (Layer 2Virtual Private Network-VPN).


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MEF nh ngha 2 kiu ca EVCs: im-im(Point-to-point).

a im - im (Multipoint-to-Multipoint).

Ngoi nhng im chung ny, dch v

Ethernet c th thay i vi nhiu cchkhc nhau.


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Khun kh nh ngha dch v Ethernet(Ethernet Definition Framework)

gip nhng thu bao c th hiu r hn s

khc nhau trong cc Dch v Ethernet, MEF pht trin cc Khun kh nh ngha dch vEthernet.

Mc tiu ca h thng ny l:

nh ngha v t tn cho cc kiu dch v Ethernet. nh ngha nhng thuc tnh (attribute) v cc thngs ca thuc tnh (attribut parameters) c dng nh ngha mt dch v Ethernet ring bit.


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Hin ti MEF v ang xc nh (v chathnh chun) hai kiu dch v Ethernet: Kiu Ethernet Line (E-Line) Service dch v

im-im (point-to-point)

Kiu LAN (E-LAN) Service dch v a im -a im (multipoint-to-multipoint)


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nh r mt cch hon ton v dch vEthernet, nh cung cp phi xc nh kiudch v v UNI.

Cc thuc tnh ca dch v EVC kthp vi kiu dch v .


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Khun kh nh ngha dch v Ethernet (EthernetDefinition Framework)

Cc thuc tnh ny c th c tp hp li theo nhngdng sau: Giao din vt l (Ethernet Physical Interface). Thng s lu lng (Traffic Parameters) Thng s v hiu nng (Performance Parameters). Lp dch v (Class of Service). Service Frame Delivery

H tr cc th VLAN (VLAN Tag Support) Ghp dch v (Service Multiplexing). Gp nhm (Bundling). Lc bo mt (Sercurity Filters).


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Kiu dch v Ethernet Line:

Kiu Ethernet Line (E-Line Service) cung

cp kt ni o im-im (point-to-point)Ethernet Virtual Connection (EVC)(hnhtrang sau).

E-Line Service c dng cho vic kt niEthernet im-im.


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Kiu dch v Ethernet Line: Dng n gin nht, dch v E-Line c th

cung cp bng thng i xng cho d liugi nhn trn hai hng khng c ccm bo tc gia hai UNI 10 Mbps.

Dng phc tp hn, dch v E-line c th

cung cp CIR (Commited InformationRate) v thuc tnh v SLA ( tr, loss,jitter,)


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Ghp dch v (service multiplexing) cho

php kt hp nhiu EVC trn mt cng vtl UNI duy nht.

Mt dch v E-Line c th cung cp point-to-point EVCs gia UNIs tng t nhvic s dng Frame Relay PVCs nilin cc site vi nhau.


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S tng t gia Frame Relay v dch v E-Line


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Mt dch v E-Line cng cung cp vic kt nipoint-to-point gia UNIs tng t vi mt dch

v thu knh ring TDM. Dch v E-Line cng c mt vi c im c bn

nh Frame Delay, Fram Jitter v Frame Loss tithiu v khng c ghp dch v (ServiceMultiplexing), tc l yu cu giao din vt l UNIring bit cho mi EVC.


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S tng t gia knh thu ring v kiu dch v E-Line


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Tm li, mt E-Line Service c th

c dng xy dng nhng dchv tng t nh Frame Relay haythu knh ring (private leased line).

Tuy nhin, bng thng Ethernet vvic kt ni th tt hn nhiu


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Kiu dch v Ethernet LAN:

Kiu dch v Ethernet LAN (E-LAN)

cung cp kt ni a im, tc l nc th kt ni 2 hoc hn nhiu UNIs.

D liu ca thu bao c gi t mt

UNI c th c nhn ti mt hocnhiu UNIs khc.


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Kiu dch v Ethernet LAN: Mi site (UNI) c kt ni vi mt

multipoint EVC.

Khi nhng site mi (UNIs) c thm vo,chng s c lin kt vi multipoint EVCnu trn do vy nn n gin ha viccung cp v kch hot (activation) dch v.

Theo quan im ca thu bao, dch v E-LAN lm cho MEN trng ging mt mngLAN o.


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Kiu dch v Ethernet LAN: Dch v E-LAN Service c th cung cp:

CIR (Committed Information Rate), CBS (Committed Burst Size),

EIR (Excess Information Rate)

EBS (Excess Burst Size)

SLA (Service Level Agreement) gm: tr,jitter, v tn tht khung (frame lost).


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Kiu dch v Ethernet LAN:E-LAN Service type dng Multipoint EVC


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Dch v E-LAN vi cu hnh point-to-point: Dch v E-LAN c th c s dng lin kt

ch vi 2 UNIs (sites). Trong khi iu ny c th

xy ra tng t mt E-Line Service, c nhiu skhc bit kh quan trng.

Vi dch v E-LAN, khi mt UNI (site) mi c

thm vo, mt EVC mi phi c thit lp lin kt UNI mi vi mt trong nhng UNIs hinthi.


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Dch v E-LAN vi cu hnh point-to-point: Vi dch v E-LAN, khi UNI mi cn c thm

vo ta khng cn thm EVC mi m n gin

ch thm UNI mi vo EVC a im c. V th,E-LAN Service i hi ch mt EVC hon ttvic kt ni multi-site.

Ni chung, dch v E-LAN c th kt ni nhiu

a im (Multi-site) vi nhau, t phc tp hnvic s dng nhng cng ngh nh FrameRelay hoc ATM.


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Dch v E-LAN vi cu hnh point-to-point: Tm li, MEF nh ngha hai kiu dch v chnh

E-Line v E-LAN, tuy nhin cc hng, t chc

tham gia MEF c cch s dng tn cho hai laidch v ny khc nhau. V d: Cisco a ra cc dch v Ethernet Relay

Service (ERS) v Ethernet Wire Service (EWS)

cho loi E-Line; Ethernet Relay MultipointService (ERMS) v Ethernet Multipoint Service(EMS) cho loi E-LAN.


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Cc thuc tnh dch v Ethernet:Ghp dch v (service multiplexing): Ghp dch v cho php nhiu UNI thuc v cc

EVC khc nhau. UNI nh vy gi l UNI cghp dch v (service multiplexed UNI). Khi UNIch thuc mt EVC th UNI ny gi l UNI khngghp dch v (non - multiplexed UNI).

Li ch ca ghp knh dch v cho php ch cnmt cng giao din UNI c th h tr nhiu ktni EVC. iu ny lm gim chi ph thm cngUNI v d dng trong vic qun tr.


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Ghp dch v (service multiplexing):


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Ghp dch v (service multiplexing): VLAN c cu hnh ti cng thit b khch hng CE kt

ni vi UNI c gi l CE-VLAN. Nh vy, ti mi UNIc mt nh x (mapping) gia CE-VLAN v EVC. iu

ny gn ging nh nh x gia DLCI v PVC trongFrame Relay.

Tnh trong sut VLAN (VLAN transparency): Mt EVC ctnh trong sut VLAN khi CE-VLAN khng thay i khikhi qua giao din UNI. Ngha l, CE-VLAN ca khung ira (egress frame) hng t MEN ra mng ca khchhng lun ging CE-VLAN ca khung i vo (ingressframe). Tnh nng ny c u im lm gim vic nhs li (renumbering) VLAN ca khch hng.


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Ghp dch v (service multiplexing): V d: nh x CE-VLAN v EVC.

EVC1, EVC2 l c tnh trong sut VLAN cn

EVC3 th khng.


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Gp nhm (Bundling):

Trong cu trc frame ca 802.1Q th c mttrng 12 bit l VLAN tag. Nh vy 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 ttc VLAN u c nh x vo mt EVC th

EVC c thuc tnh gp nhm tt c trong mt(All-to-one Bundling).


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c tnh bng thng (Bandwidth profile):

MEF ng ngha c tnh bng thng c ngdng UNI hay cho mt EVC.

c tnh bng thng l mt gii hn m khungEthernet c th xuyn qua UNI.

C th c c tnh bng thng ring r chonhng khung vo bn trong MEN v cho nhngkhung i ra khi MEN. Thng s CIR(Committed Information Rate) cho mt FrameRelay PVC l mt v d ca c tnh bng thng.


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MEF nh ngha ba thuc tnh sau y cac tnh bng thng:

c tnh bng thng ti UNI.

c tnh bng thng theo EVC.

c tnh bng thng theo m xc nhlp dch v (CoS Identifier).


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c tnh bng thng bao gm 4 thng s lulng. Nhng gii hn ny nh hng n

thng lng m dch v cung cp. c tnh bng thng cho mt dch v Ethernet

bao gm nhng thng s lu lng sau y: CIR (Committed Information Rate)

CBS (Committed Burst Size) EIR (Excess Information Rate)

EBS (Excess Burst Size)


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Mt dch v c th h tr ln n 3 dngkhc nhau ca c tnh bng thng UNI. Mt trong nhng dng c th ng dng

ti UNI, theo EVC hay theo m xc nh

lp dch v.


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Thng s hiu nng (Performance parameters):

Cc thng s ny nh hng n cht lngdch v m thu bao cm nhn c. Cn gi lSLA (service level Agreement)

Thng s hiu nng c nh gi qua ccthng s sau: kh dng (Availability)

tr khung (Frame Delay) trt khung (Frame Jitter) T l tn tht khung (Frame Loss)


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Vn an ninh mng (Network security)

Mng Metro Ethernet cung cp mngring o lp 2 (layer 2 VPN) nn nhng

vn an ninh tn ti cn c bit quantm 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)

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