quyển quản lý mạng viễn thông

7/31/2019 quyn qun l mng vin thng

1/21

Tm hiu v h thng qun l gim st mng t xa RMON

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HC VIN CNG NGHBU CHNH VIN THNG

KHOA K THUT IN TVIN THNG 1

Tiu Lun

TM HIU V H THNG QUN L GIM STMNG TXA RMON

Mn hc: Qun l mng vin thng

Ging vin: Th.s Dng Th Thanh T

Nhm sinh vin: Phm Vit Cnh

Phan Trn H

ng Th Hng Diu

Nguyn Th Qunh Trang

H ni T3/2012


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MC LC

Chng 1 :CC KHI NIM CHUNG Trang

1.1 Cc khi nim ............................................................................................................... 4

1.1.1Khi nim gim st mng vin thng...................................................................................4

1.1.2 Cc phng php gim st mng vin thng ..........................................................................5

1.1.2.1 Phng php gim st mng thng..5

1.1.2.2 Phng php gim st mng bng ...6

1.1.3 Khi nim RMON.

1.1.3.1 Khi nim gim st mng txa RMON .9

1.1.3.2 S khc bit gia RMON v SNMP..9

1.1.3.3 Mt sc tnh c bn ca RMON9

1.1.3.4 Cu hnh RMON c bn.10

1.1.3.5 iu khin thit bRMON.10

Chng 2 :HOT NG CA RMON

2.1 Hot ng ca RMONv1......................................................................................................12

2.2 Hot ng ca RMONv2 .....................................................................................................18


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DANH MC HNH V

1.1 Cu hnh RMON in hnh.

2.1 S cc nhm ca RMONv1 v RMONv2.

2.2 S quy c EntryStatus.

2.3 S cc nhm chc nng ca RMONv1

2.4 S Chc nng ca cc nhm i tng ca RMONv1

2.5 S chc nng ROMNv2

THUT NGVIT TT

T vit tt Ting anh Ting vitFDDIIETF Internet Engineering Task Force T chc h trk thut InternetMIB Management Information Base C sthng tin qun lNMS Network Management System

Network Management StationH thng qun l mngTrm qun l mng

QoS Quality of Service Cht lng dch vRED Random Early Detection K thut loi b sm ngu nhinSNMP Simple Network Management

ProtocolGiao thc qun l mng n gin


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CHNG 1 : GII THIU CHUNG V RMON

1.1 : CC KHI NIM1.1.1: KHI NIM GIM ST MNG VIN THNG

Gim st mng vin thng l qu trnh dng nhng giao thc nht nh tc ngln h thng nhm mc ch kim tra, gim st hiu nng thc t ca dch vmng vi cc tha thun cung cp cht lng dch v c nh sn, trong sutqu trnh hot ng ca h thng vin thng.

Gim st mng c tip cn theo hai phng php: gim st mng txa thng v gim st mng chng.

o Gim st mng thng :l qu trnh cc thit b mng ghi li cc trng thilu lng mng cung cp thng tin ca mt phn t mng thc t, cngvi cc bn tin thm d polling c pht i nh k t my ch gim st thu thp d liu, qun l, phn tch.Nh vy phng php gim st nych c th theo di tng phn t mng m khng ththeo di c hot

ng tng th ca mng vin thng.

o Gim st mng chng : l qu trnh my ch gim st mng gi i ccgi tin thm d vo mng sau phn tch, nh gi kt qu truyn thngti pha thu, t c th gim st mng t mt lot cc phn t ca mng.

Nh vy phng php ny s c tnh gim st tng thhn , chng hnso vi phng php gim st mng thng.

1.1.2CC PHNG PHP GIM ST MNG

1.1.2.1 PHNG PHP QUN L MNG THNG

Phng php qun l mng bng lin quan n vn gi thng tin gim st gim st trng thi duy tr cc chc nng QoS ang thc hin.Phng php ny thngs dng cc giao thc SNMP n gin thu thp thng tin trong c sd liu qun l


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MIB.Bao gm cc kha cnh: tn sut gi thng tin, trng thi trn tng lin kt, gim sth thng v ma trn lu lng li.Ta s xt ln lt cc kha cnh ny trong phn sau.

Tn sut gi thng tin:Tn sut gi thng tin gim st c xc nh bng s cn bng khnng x l

ca h thng qun l mng , ti nguyn ca cc thit b v snh hng ca lu lnggim st trn mng. Chu k gim st ln c kch thc mu ln v c thc s dngcho cc mc tiu mang tnh chin lc.Tuy nhin, d liu gim st c th c gi tr trungbnh trong khong thi gian di v khng th hin c sthay i trong h thng. Vvy, cc chu k ngn c a chung hn v cc php o a li kt qu tt hn mc dcn bng vi lu lng gim st.

Cc trng thi trn tng lin kt: Cc trng thi trn tng lin kt c s dng vicc mc ch khc nhau ty thuc vo v tr trong mng v chia lm 2 kiu: linkt truy nhp v lin kt li.

o Cc lin kt truy nhp c th bao gm c vng phn bit dch v v c vngnh cung cp dch v v khch hng.V vy, trng thi lin kt truy nhpc s dng cho c mc ch pht hin li v bo co trng thi ti khchhng s dng dch vcng nh ti cc lp QoS ca thit b mng.

o Trn cc lin kt li, trng thi cht lng dch vc s dng cho cmc ch pht hin li v nh mt tham su vo ca tin trnh quy hochmng li.

Cc trng thi trn tng lin kt c xc nh bng 1 sphng php nh sau:gim st lp, gim st chnh sch gim st hng i v mt gi.o Gim st lp: Mc ch s dng chnh ca cc trng thi phn lp l

xc minh lu lng c nm trong lp hay khng.Cc trng thi lp cnc thc s dng xc minh hoc suy ra cc trng thi khc.Gimst phn lp c thc hin trn tng lp hoc trn nhiu lp cng 1lc.

o Gim st chnh sch: Gm kiu p buc ti a cho dch v thi gianthc v nh du cc lu lng trong trng hp ng lu lng.

o Gim st hng i v mt gi: Phng php thng thng gim sthng i v t l loi bc gi thc hin qua slng gi tin truyni v slng gi tin ri trn ng truyn. Vic gim st t l tn thtcn c thucxc nh thng qua slng gi tin hy b theo trngs ti phn ui ca lu lng hoc thng qua gim st k thut loi bsm gi RED (Random Early Detection)


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Gim st h thng:V nguyn tc, cc gi tin b loi b ti nt mng. Ty theo kin trc ca cc nt

mng m cc gi tin c th b loi cc vtr khc nhau theo cc iu kin rng buc cah thng. Vic mt gi tin l iu khng th trnh khi, v vy vic gim st cc trng

hp mt gi l rt cn thit nhm cung cp thng tin v cc vn gy nh hng tricht lng dch v.Ta c mt vi kiu h thng loi bgi tin in hnh nh:

o Loi bgi khng lu m: b nhm c chia s gia cc hng itrong h thng. Ti , nu slng gi tin n qu ln gy nn qu tis dn n tc nghn l ri gi.

o Loi b gi ti u vo: do khng b nhm cho cc gi tin uvo mc d cc qu trnh chuyn mch v nh tuyn vn ang thchin

Ma trn lu lng li:L mt ma trn ca cc yu cu lu lng u vo v u ra trong mng li.Ma

trn lu lng c tho hoc nh gi t cc trng thi thu thp c qua cc k thutgim st thng. Li ch chnh ca ma trn lu lng li l lp k hoch mng, don mc tng trng lu lng v m hnh cc kch bn c th xy ra nhm don snh hng ca li trong cc thnh phn mng li ti hiu nng ton mng.

1.1.2.2 PHNG PHP QUN L MNG CHNG

Gim st chng t mc mng s dng mt s lung lu lng trong c cha cc gi tin thm d. phng to lu lng mng nhmnh gi cc tham s hiu nng. Trong cc mi trng phn bit dchv, gim st mng chng c th s dng o hiu nng ca tt ccc phn lp lu lng.

Qu trnh ny yu cu cc h thng thm d tch cc c c agent giva nhn thng tin thm d.Cc agent o cc lung lu lng n vphn tch cc kt quo.Cc kt qu c th ly nh k t cc thit bochng qua giao thc SNMP. Thm vo , cc thit b gim st c

tha ra cc by nu c cc ngng xc n nhm gim st hiu nngkhi cc h thng qu ti.

Qu trnh gim st chng bao gm cc kha cnh sau :o Cc tham slu lng kim tra : Cc kt quo ch hu dng

khi n th hin c chnh xc hiu nng ca cc ng dnghoc lp lu lng ca mng. iu ny dn n yu cu phi


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xc nh cc tham s lung lu lng thch hp phn nhchnh xc c tnh mng. Cc phng php o khc nhau s dnti cc tham s khc nhau.

o Kch thc gi :Kch thc cc gi tin gim st c thnhhng ln ti tr ni tip ca cc lin kt tc thp, cc gi tingim st cng kch thc phn nh chnh xc tr ca ccng dn. Cc gi tin gim st c kch thc ln c th b loib ti cc im tc nghn do trn bm. Trong mi trng ccc lin kt tc thp, cc gi tin gim st c kch thc nhc s dng v mc tiu kinh t. Hn na, khi s dng cc gitin gim st kch thc ln s nh hng ti lu lng mngcn gim st.

o Chin lc ly mu : Chin lc ly mu thm d xc inh phnb ca tr t cc gi tin gim st lin tc gm 3 kiu : Kiu lymu nh k gi thng tin theo tng khong thi gian, trong tipcn ny c thkhng thu c cc thng tin s kin trongkhong thi gian gia hai ln ly mu. Kiu ly mu ngu nhingi tin gim st ngu nhin c phn b theo mt dng hmmt xc sut nhm a ra cc mc o ph hp hn vi sphn blu lng mng. Ly mu theo tng t l s kt hpca cc gi tin gim st theo tng nhm v khong cch gia ccnhm c ththeo nh k hoc ngu nhin.

o Tc kim tra gim st : Tc kim tra, gim st c xcnh qua slng gi tin gi i trong chu trnh kim tra gimst, tc kim tra c th gy xo trn lu lng trongmng nu c mt lng ln cc gi tin c gi qua cc lin ktc bng thng thp v gy ra kt quo sai. Vic xc nh chnhxc tc kim tra thch hp da trn tnh cn bng gia chnh xc ca cc php o v mc nh hng ti cc lung lulng trn mng. Trn thc t, tc ny ph thuc vo ccc tnh ca ng dng hoc lp ng dng b gim st.

o Thi gian kim tra v tn sut : Thi gian kim tra v tn sutcn ln nhm m bo tnh chnh xc ca php o. Ngngthp nht ca (thi gian x tn sut) ch ra mt ca sp ng xcsut s kin cn gim st, khung ca s cng ln dn ti xc sutmt s kin cng nhiu. Thm vo , nu cc thit b gim st


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chng lu gi thng tin trng thi qua cc chu k kim tra, tc kim tra nh hng rt ln ti kt quo.

Cc tham so chng C th l mt tham sn hoc mt tptham sc xc nh qua lung lu lng gim st. Cc tham s

thng dng thng l :tr, bin ng tr, tn tht gi, bng thng v thng qua, s sp xp li, kh dng v cht lng cm nhn tpha ngi dng QoE.

Cc kha cnh trin khai gim st chng:Mt h thng o chng s dng cc agent gim st chng gi v nhn cc gi tingim st. Cc agent ny c th gn hoc nhng vi cc thitb mng. Cc agent gn ngoi c th l phn cng c bit chyphn mm gim st ch ng. Tip cn ny a ra c cch nhnkhch quan nht tpha ngi s dng, tuy nhin n yu cu b

sung cc thit bv lm tng gi thnh. i ngc vi cch tip cntrn, mt s nh cung cp thit b h trsn cc agent gim stchng trong cc sn phm,cho php trin khai nhanh cc hthng gim st m khng cn b sung thit b ph tr. Do ccthng so t gim st chng th hin cc c tnh ng dng nncc thit b gim st chng cng gn vi cc h thng ng dngu cui cng tt. Tuy nhin, iu ny ty thuc vo cu hnh mngtrin khai trong thc tin v thng c cc dng cu hnh nh : cuhnh kt ni hnh li y , cu hnh kt ni hnh li tng phn

v cu hnh kt ni hnh li phn cp. Ngoi ra cn mt svn nh hng ti m hnh trin khai h thng gim st chng nh : o cc ng dn a ng cn bng gi v ng hng bcng l nhng vn quan trng nh hng ti h thnggim st chng.

1.1.3 : KHI NIM RMON1.1.3.1Khi nim gim st mng t xa RMON

o Gim st t xa RMON (Remote MONitoring) l mt tiu chun mcnh ngha bi IETF v n bao gm 2 phin bn l RMONv1 (RFC2819),


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RMONv2 (RFC2021).RMON cung cp cc thng tin tiu chun cho ngiqun tr mng c th s dng gim st, phn tch, sa li cho mt nhmmng cc b phn tn v kt cui T1/E1, T2/E3 ti cc trm trung tm.

1.1.3.2Skhc bit gia RMON v SNMP :o

RMON da trn tht b,trong s dng cc phn cng c bit iuhnh.o RMON gi thng tin theo phng php chng nhm s dng ti u

bang thng.o RMON cung cp mt h thng gim st mnh m vi chi ph thp, cc

thm d RMON thng c ci t trong cc lin kt ng trc v mych.

o H thng RMON c th cu hnh cung cp d liu nh: Cc thng tin lin quan n hiu sut mng. Cc thng tin thng k cho phn tch trng thi v chin lc mng. Thng tin m t truyn thng gia cc h thng v lng d liu

trao i.

1.1.3.3 Mt sc tnh c bn ca RMON

o iu hnh ngoi tuyn :RMON cho php mt phn tthm d thc hincc cng tc chn on v thu thp thng tin lin tc ngay c khi truynthng vi trm qun l khng kt ni.

o Gim st chng : RMON vi thit b gim st t xa (phn tthm d)c mt ngun ti nguyn thchin chn on v lu gi thng tin hiunng mng, n c th thng bo ti trm qun l li v lu tr thng tintrng thi v li.

o Pht hin v bo co li :Phn tthm d c thc cu hnh nhm nhndng cc iu kin li v kim tracc li. Khi mt trong cc iu kin b vi

phm, s kin c ghi li v c thng bo ti cc trm qun l theo mts cch thc khc nhau.

o Dliu gia tng gi tr: thit bgim st t xa c th thm cc gi tr vo dliu thu thp nhm h trcc phn tthm d a ra c cc thng tinchnh xc hn ti thit b gim st t xa.


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o a qun l : Do mi trnga qun l rt ph bin trong thc t, cc thitb gim st t xa cn c chc nng phn phi thng tin ti nguyn ti cctrm qun l khc nhau.

1.1.3.3Cu hnh RMON c bn:

Hnh 1.1 cu hnh RMON in hnh

Gm mt trung tm qun l mng NMS v mt thit b gim st t xa RMON. Trung tm qun l mng NMS c th hot ng trn cc my ch windows,unix

hoc my PC chy cc ng dng qun l mng nhm thc hin cc nhim v tphp trng thi qua vic gim st cc gi tin d liu trn mng, lu tr cc thng tinph hp vi c tnh ca RMON.

1.1.3.4iu khin thit b RMON Mt si tng trong MIB cung cp mt c ch thc hin cc hot ng

ca thit bgim st txa. Cc i tng ny c th thc hin cc hot ng

khi c sthay i trng thi ca i tng.o Chia s ti nguyn gia cc trm qun l: Khi s dng h thng a

trm qun l , ngun ti nguyn c chia s gia cc trmqun l.nh b nhv ngun ti nguyn tnh ton phc v cho cc yu cuchc nng. Mt s vn tranh chp thng xy ra gm:

Hai trm qun l cng mun s dng ngun ti nguyn vtqu khnng cathit b.


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Mt trm qun l s dng mt lng ti nguyn nht nhtrong mt khongthi gian di.

Mt trm qun l s dng cc ti nguyn v khng gii phngsau khi s dng.

oBsung hng gia cc trm qun l: Trong c sthng tin qunlMIB, cc hng thng xuyn c b sung vo trong mt bng cu hnh mt chcnng. Cu hnh ny thng gm cc tham siu hnh chc nng. Agent cn kimtra cc tham sny m bo chng ph hp vi cc gii hn c nh nghatrongMIB cng nh gii hn v ti nguyn.

Cc khi thc thi Agent c th nhm ln khi kim tra cctham s ny v bo li ti trm qun l rng cc tham sny khng cgi tr do hai khnng sau:Khi mt trm qun

l t ring lcc i tng tham s, khi trm qun l tmt i tng trng thi khng chnh xc.


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CHNG II : HOT NG CA RMON

2.1 RMONv1

RMONv1 gm 9 nhm c nh ngha bi RFC 1757vmt nhm mrng cho TokenRing RFC 1513. Cc nhmtrong RMONv1 c thhin qua hnh 2.1

Hnh 2.1 cc nhm ca RMONv1 v RMONv2

Hai loi d liu c nh ngha trong RMON1 c quyc l chui d liuca ngi qun l (OwnerString) vtrng thi khon mc (EntryStatus). Hai kiu dliu nyc s dng bi h thng qun l gim st v thit b chu

qun l gim st. D liu trng thi khon mc EntryStatus c s dng

gii quyt xung tc th xut hin gia h thng qun lbng phng php nhn cng. i vi mtbng iu khinnhiu ngi s dng, mt ct c s dng ring cho dliu trngthi khon mc EntryStatus v gm 4 trng thi:


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(1) valid, (2) createRequest, (3)underCreation, v (4) invalidnh hnh 2.2 sau:

Hnh 2.2 Quy c EntryStatus.

Cc nhm chc nng ca RMONv1 th hin trn hnh 2.3 sau

Hnh 2.3 cc nhm chc nng ca RMONv1

o Module thu thp d liu nhn cc thng tin gim st vchuyn titng khi chc nng qun l . Cc d liu c a vo 5 khichc nngtrong c 3 khi s dng gim st lu lng thng


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k cho cc kiu mng v thitb (tokenRing, Ethernet v mytrm).

o Cc u ra ca cc module ny a rapha qun l mng cc thngtin thng k di dng bng biu hoc biu . Nhmchc nng

lc bao gm chc nng lc gi theo chui v la chn cc knhtng ng,khi lc a ra cc thng tin cnh bo hoc cc s kinkhi cc d liu vt qu giihn hoc khng hp l. Cc thng tinca nhm lc c thc lu tr trong modulebt gigi tin phn tch cc mu lu lng hoc cc s kin bt thngtrongmng.

o Tt ccc nhm trong c sthng tin qun l MIB ny u l tychn,b sung ca MIB ny u ko theo s b sung nhm giaodin v h thng ca MIBII.MIB-II cng c thy thc s b sung

ca cc nhm ph. Cc nhm ny c nhngha cung cp mtphng tin gn nhn dng i tng v cung cp mtphngphp cho cc agents qun l bit i tng no cn cb sung.

Chc nng ca cc nhm i tng ca RMONv1 c th hin trn bng 2.4 sau.o Nhm thng k Ethernet cha cc d liu thng k o bi cc phn tthm

d trnmi giao din Ethernet ca thit b. Nhm ny gm bng d liuthng k Ethernet (etherStatsTable). Da trn cng m hnh ny, cc nhmkhc c thc nh nghacho cc kiu phng tin khc nh FDDI v

TokenRing.o Nhm iu khin lch siu khin mu trng thi thng k nh k ca d

liu t cckiu mng khc nhau. Trong nhm ny gm bng iu khin lchs(historyControlTable).

o Nhm lch s Ethernet ghi li cc mu thng k nh k t mng Ethernetv lu tr tcc ln ly d liu sau cng. Nhm ny gm bng lch sethernet (ethHistoryTable).Cc nhm ny c thnh ngha cho cc kiu

phng tin khc nh FDDI vTokenRing.o Nhm cnh bo nh ka ra cc mu thng k t cc bin trong d liu

thm d vso snh chng vi cc ngng c cu hnh. Mt s kinc to ra nu cc binvt qu ngng nh sn. Mt c ch gy trc thc hin nhm gii hn cc bntin cnh bo, trnh sgia tng cacc bn tin cnh bo gy tc ng xu ti hiu nngmng. Nhm ny gmbng cnh bo (alarmTable) v cc c ch thc thi s kin.


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Hnh 2.4 Chc nng ca cc nhm i tng ca RMONv1

o Nhm my trm cha cc d liu thng k lin quan ti cc s kin phthin mytrm trong mng, cha danh sch cc a ch MAC ngun/ch tcc gi tin trongmng. Nhm ny gm cc bng: bng iu khin my trm(hostControlTable); Bng my trm (hostTable) v bng thi gian mytrm (hostTimeTable).

o Nhm hostTopN c s dng cho cc bo co m t gim st cc mytrm trn t trn xung di theo th t thng k gm N my trm. Ccthng k kh dng l ccmu thng k thu c theo thi gian xc lp bitrm qun l . V vy, mu thng k ny da trn tc ly mu. Trm

qun l cng la chn slng cc my trm boco (N). Nhm ny gmbng iu khin my trm nh (hostTopControlTable), bng my trmnh (hostTopTable) v yu cu thc hin trong nhm my trm(hostgroup).

o Nhm ma trn lu tr d liu thng k lu lng s dng cho nhim vtrao i thngtin gia hai tp a ch. Mt khon mc mi trong bng nhtuyn c to ra khi mtthit b nhn dng c mt qu trnh trao i.Nhm ny gm bng iu khin matrn (matrixControlTable), bng matrn ngun (matrixSDTable) v bng ma trn ch(matrixDSTable).

o Nhm lc cho php lc cc gi thch hp nhm phc v cho qu trnh gimst. Nhmny gm bng lc gi (filterTable) nhm cho php cc gi tinthch hp c chuynqua knh truyn v bng knh (channelTable) thhin knh thng tin truyn cc gitin gim st.

o Nhm bt gi cho php cc gi c thu thp sau khi chuyn qua knhtruyn. Nhmny gm bng iu khin m (bufferControlTable), bng b


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m bt gi(captureBufferTable), cc nhim v bt gi gi tin trong bm c thc thi trongnhm lc gi.

o Nhm s kin iu khin chc nng to v thng bo cc s kin t ccthit b. Nhmny gm bng s kin (eventTable) m t cc s kin s

c thng bo v bng luvt (logTable) lu li lch s cc s kin.2.2 RMONv2

RMONv2 gm 9 nhm c nh ngha bi RFC 2021 vmt nhm mrng choTokenRing RFC 1513. Cc nhm trong RMONv1 c th hin qua hnh 2.1 vhnh 2.5


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HNH 2.5 chc nng ROMNv2


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o Th mc giao thc l mt phng php cho php mt ng dng RMONv2d dnglin kt iu hnh vi cc giao thc c trin khai trong cc agent.

Nhm th mcgiao thc m t nhn dng cc giao thc thng qua cc thamsc phn t gim stthu thp (v d, ch s cng UDP) cho tt c cc

giao thc lp pha trn lp IP. Cctham s cu hnh cho phn t gim stc thay i trong bng th mc giao thc(ProtocolDirTalbe), mi giaothc c nhn dng thng qua mt ch s ID trn ctduy nht trong bng.Cc giao thc th hin trong th mc giao thc c nh nghatrong RFC2074.

o Nhm phn phi giao thc cung cp thng tin vlu lng tng quangia cc giaothc khc nhau trn c scc octet hoc cc gi. Thn vo ,nhm phn phi giaothc thc hin vic nh x cc d liu thu thp cbi phn t gim st v ti tngiao thc hin thcho ngi qun l

mng. Bng d liu phn phi giao thc(protocolDistControlTable) ccu hnh theo d liu c tp hp v lu tr tibng thng k phn phigiao thc (protocolDistStatsTable).

o Nhm nh xa ch thc hin bin dch a ch lp MAC v lp mngthng quaphn t gim st nhm cung cp thng tin ti ngi qun l mngv nn tng qun l. nh xa chc thc hin trn cc giao din thngqua hai bng d liu: bngthng k phn phi giao thc(protocolDistStatsTable) v bng iu khin nh xach(addressMapControlTable).

o Nhm my trm lp mng cung cp thng k thng tin lp mng c phnloi theoa ch mng. Nhm ny gim st v thng k lu lng i/n cca ch mng thngqua phn tthm d. Nhm gm mt bng nh xach lp mng(addressMapTable) v bng iu khin my trm(HostControlTable).

o Nhm ma trn lp mng lu tr cc thng k lu lng ng dng ctruyn thnggia cc tp a ch lp mng. Nhm ny gm bng iu khinma trn lu lng(matrixHostTable) v bng d liu lu lng gia cccp my ch (hostTable).

o Cc chc nng lp ng dng trong my trm c chia thnh hai nhmgm nhm lpng dng my trm v nhm ma trn lp ng dng. Ccthng tin vng dng v lulng d liu giao thc c th hin qua ccbng ca lp ng dng lu tr s liuthng k va ch, lu lng i vn my trm v bng iu khin.


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o Nhm ma trn lp ng dng thng k lu lng giao thc c chuyngia cc cpmy trm.

o Cc thng tin cnh bo v lch sngi s dng c thu thp trong nhmthu thp

othng tin lch sngi s dng. Cc chc nng ny c thc hin bi cch thng

o qun l mng. Cc i tng d liu c tp hp trong cc nhm bucket,mi nhmbucket gn lin vi mt i tng MIB v cc phn t trongnhm l cc trng hpca i tng MIB. Ngi dng c ththay i dliu c tp hp bng vic nhpd liu trong bng iu khin lch sngi s dng (usrHistoryControlTable), khi sc kt hp vi cchng ca cc trng hp trong bng i tng lch sngis dng(usrHistoryObjectTable).

o Chc nng ca nhm cho php mt ng dng RMON ca mt nh cungcp thit b cth cu hnh t xa cc tham s ca phn tthm d thuc vnh cung cp thit bkhc. RMONv2 bsung thm tnh nng tng thchvi cc c tnh bt buc hoc tychn nhm h trcc nh cung cp thitb b sung cc tham s gim st cho cc hthng gim st t xa. Cc chcnng cu hnh gm: Cu hnh truy nhp ni tip(modem); cu hnh a chIP; cu hnh cc kt ni ni tip cho by (trap) v cu hnhcc tham s by.


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TI LIU THAM KHO :

o 1: Bi ging Qun l mng vin thng ,TS. Nguyn Tin Ban,Ths HangTrng Minh, Ths Nguyn Th Thu Hng , Ths Dng Thanh T .Hc vincng nghbu chnh vin thng,Nm2010.

o 2: Sline bi ging Qun l mng vin thng , Khoa k thut in t vinthng 1, Hc Vin Cng NghBu Chnh Vin Thng.

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