8 cc tuyn ng Tr lnPhn ny m t cch RPL pht hin ra v duy tr cc tuyn ng hng ln. N m t vic s dng cc thng tin DODAG Objects (Dios), cc ip c s dng pht hin v duy tr cc ng bay. n ch nh cch RPL to v p ng Dios. N cng m t DODA, Thng tin mi thu (DIS) thng ip, c s dng kch hot Truyn DIO. Nh cp mc 3.2.8, cc nt rng quyt nh tham gia mt iu khon DODAG PHI t nht mt DODAG cha m nh l mt tuyn ng mc nh cho cc V d lin quan. Tuyn ng mc nh ny cho php mt gi tin n c chuyn hng ln cho n khi n cui cng truy cp mt t tin chung t m n s c chuyn i xung n ch. Nu cc ch khng trong DODAG, sau vo th mc gc DODAG c th chuyn tip cc gi tin bng cch s dng kt ni vi bn ngoi ca cc DODAG; nu n khng th chuyn tip cc gi tin bn ngoi, sau vo th mc gc DODAG phi th n. Mt tin nhn DIO cng c th vn chuyn thng tin nh tuyn r rng: DODAGID: Cc DODAGID l mt a ch IPv6 ton cu hay a phng c o ca root. Mt nt tham gia mt d DODAG nn mt tuyn ng chuyn thng qua mt ph huynh DODAG n a ch c s dng bi cc gc nh DODAGI, RIO Prefix: Cc gc TH t mt hoc nhiu ty chn Route Thng tin trong mt tin nhn DIO. RIO c s dng qung co bn ngoi con ng c th truy cp thng qua cc gc, lin kt vi mt u tin, nh trnh by trong phn 6.7.5, trong kt hp RIO t [RFC4191]. N c hiu nh l mt kh nng ca gc nh tri ngc vi mt qung co nh tuyn, v n cm c phn phi trong mt giao thc nh tuyn mc d n nn c s dng bi mt s xm nhp inh tuyn cua RPL chn mt DODAG khi mt gi c tim trong mt min RPL t mt nt gn vo b nh tuyn RPL. Mt chc nang mc tiu C TH s dng cc tuyn ng qung co ti RIO hoc u tin cho nhng tuyn ng ng h mt DODAG so vi mt s khc cho cng mt v d.8.1. Quy tc c c ca DIO 1. i vi cc lnh vc c s ca DIO , mt nt ci m khng phi l mt DODAG gc ch khng phi l qung co gi tr ging nh DODAG m a thch ca mnh(Quy nh ti mc 8.2.1). Bng cch ny, cc gi tr ny stuyn truyn Down the DODAG khng thay i v c qung co bi mi nt s c mt con ng m gc DODAG. Nhng lnh vc nhsau:1. Grounded (G)2. Phng thc hot ng (MOP)3. DAGPreference (PRF)4. Version5. RPLInstanceID6. DODAGID

2. Mt nt TH cp nht cc trng sau ti mi hop:1. Rank2. DTSN

3. Cc lnh vc DODAGID mi b r phi l duy nht trong khong cch ca RPL v phi l mt a ch IPv6 c th nh tuyn thuch thng gc 8.2. S khm ph cc inh tuyn tr ln v s duy tr ca n Khm ph cc inh tuyn tr ln cho php mt nt tham gia vo mt DODAG bng cch khm phnhng g lin quan ci m thuc thnh vin ca DODAG quan tm v xc nh mt t ca cha m. Cc chnh sch chnh xc cho vic la chn cc nc lng ging vcha m l thc hin ph thuc v thc y bi s OF. iu ny gp phn xc nh tp cc quy tc cc chnh sch phi tun theo kh nng tng tc.8.2.1. Hng xm v ph huynh trong mt phin bn DODAGCc thut ton pht hin ng hng ln RPL v ch bin trong iu kinca ba b hp l ca cc nt link-local. u tin, cc ng c vinhng xm tp l mt tp hp con ca cc nt m c th t c thng qua cc mi gn kt multicast a phng. Vic la chn cc thit lp ny l thc hin v OFph thuc. Th hai, cc m t l mt tp hp con b hn ch cang c vin hng xm t. Cui cng, ph huynh a thch l mt thnh vin catp cha m l a thch cc bc k tip trong tuyn ng hng ln.V mt khi nim, cc ph huynh a thch l mt ngi m c thn; mc d, nc th l mt tp hp ca nhiu ph huynh nu cc bc cha m l nh nhau a thch v c Rank ging ht nhau.Chnh xc hn:1. nhng b DOAG PHI l mt tp hp con ca cc ng c vin CA CC B ln cn.2. Mt DODAG gc phi c mt DODAG m ci m l tp hp cc kch thc bng khng.3. Mt nt khng phi l mt gc DODAG c th duy tr mt ph huynh tp DODAGkch thc ln hn hoc bng mt.4. M ci nt u tin phi l thnh vin ca DODAG5.Mt nt RANK phi c ln hn tt c cc yu t ca n DODAGb ph huynh.6. Khi Neighbor Unreachability Detection (NUD) [RFC4861], hoc mtc ch tng ng, xc nh rng mt ngi hng xm khng cnkt ni, mt nt RPL KHNG PHI xem xt nt ny trongng c vin hng xm thit khi tnh ton v cc tuyn ng qung cocho n khi xc nh rng n l mt ln na th truy cp. Tuyn ng quamt ngi hng xm khng th truy cp phi c loi b khi bng nh tuyn.Nhng quy nh ny m bo rng c mt phn th t nht qun trn cc nt trong DODAG. Chng Ranks nt khng thay i, sautrn nguyn tc m bo rng con ng ca mi nt mt gc DODAG l tip vngmin ph, nh Rank gim trn mi hop vo th mc gc.Cc ng c vin c th hng dn ca ngi hng xm tp v thit lp la chn cha m, nh tho lun trong [RFC6552] 8.2.2. Hng xm v ph huynh qua cc phin bn DODAG Cc quy tc trn cai tr mt DODAG bn duy nht. Nhng quy nh trong ny gp phn xc nh cch hot ng ca RPL khi c nhiu DODAG Cc phin bn. 8.2.2.1. DODAG Version 1. Cc tuple (RPLInstanceID, DODAGID, DODAGVersionNumber) duy nht nh ngha mt bn DODAG. Mi phn t ca DODAG m ca mt nt tp hp, nh c truyn t bi cc tin DIO nghe cui cng t mi DODAG cha m, phi thuc v DODAG cng bn. Cc yu t ca mt ng c vin hng xm set nt ca TH thuc DODAG khc nhau ca cc phin bn.2. Mt nt l mt thnh vin ca mt bn DODAG nu mi phn t ca DODAG m tp hp thuc v m DODAG bn, hoc nu nt l gc r ca DODAG tng ng.3. Mt nt PHI KHNG gi Dios cho phin bn DODAG trong n khng phi l mtthnh vin.4. DODAG r TH increment DODAGVersionNumber rng hqung co v do di chuyn n mt DODAG Version mi. Khi mt DODAGgc s gia DODAGVersionNumber ca n, n phi thc hin theo ccc ca Serial Number Arithmetic nh c m t trongMc 7. S kin gy ra s tng ca DODAGVersionNumber s c m t trong phn ny v trong Mc 18.5. Trong thi hn mt DODAG a ra, mt nt l mt khng phi l mt gc khng phi qung co mt DODAGVersionNumber cao hn so vi mc cao nhtDODAGVersionNumber mnh nghe. Cao c nh ngha l ln hn iu hnh ti mc 7.6. Khi mt nt c qung co mt bn DODAG bng cch gi mt DIO, nKHNG PHI l mt thnh vin ca mt DODAG bn trc ca cng mtDODAG (tc l, vi RPLInstanceID cng, cng DODAGID, v mt thp hn DODAGVersionNumber). Thp c nh ngha l qu tiu hnh ti mc 7.Khi ph huynh DODAG thit lp tr nn trng rng trn mt nt khng phi l mt gc,(Tc l, cha m cui cng c g b, gy ra cc node khng cnc lin kt vi DODAG ), sau cc thng tin DODAG nnkhng b n p cho n khi ht mt implementation-gi a phng c th. Trong khong thi gian trc khi n p"c" nh nc DODAG, cc nt s c th quan st nu ccDODAGVersionNumber c tng ln nn bt k bc cha m mixut hin. iu ny s gip bo v chng li kh nng ca cc vng c th xy ra nu nt l v tnh ti gia nhp DODAG cPhin bn trong chnh trc ph DODAG ca n.Khi DODAGVersionNumber c tng ln, mt DODAG Version mi ly lanl ra t gc DODAG. Mt ph huynh rng qung co miDODAGVersionNumber khng th thuc v cc tiu DODAG ca mt nt qung co mt DODAGVersionNumber c. Do , mt nt c th thm mt cch an ton mt ph huynh ca bt k Rank vi mt DODAGVersionNumber mi hnm khng to thnh mt vng.V d, gi s rng mt nt li mt DODAG viDODAGVersionNumber N. Gi s rng mt nt c mt tiu DODAG v lm c gng u c rng ph DODAG bi qung co Xp hng ca INFINITE_RANK, nhng nhng qung co c th tr thnh b mt trong LLN.Sau , nu cc nt quan st mt qung co ng c vin hng xmc mt v tr trong DODAG gc ti DODAGVersionNumber N, l ng c vin hng xm c th c th c c trong tiu cu ca ntDODAG, v c mt trng hp c th, thm ng c vinngi hng xm l mt ph huynh c th gy ra mt vng lp. Trong trng hp ny, nu ng c vin hng xm l quan st qung co cho mt DODAGVersionNumber N + 1,sau l ng c vin hng xm chc chn l an ton, v n lnht nh khng phi l ch nt gc ca tiu DODAG, v n cc th tng DODAGVersionNumber bi nghe t DODAGgc trong khi nt gc c tch ra. V l do ny, n lhu ch cho cc nt tch ra nh DODAG gcthng tin, bao gm c cc DODAGVersionNumber N.Chnh xc khi gia s mt gc DODAG cc DODAGVersionNumber l thc hin ph thuc v ra khi phm vi cho c im k thut ny.V d nh incrementing DODAGVersionNumber nh k,khi can thip hnh chnh, hoc pht hin cp ng dng cc kt ni b mt hoc DODAG km hiu qu.Sau mt nt chuyn tip thnh v qung b mt DODAG Version mi,quy tc trn lm cho n khng th qung co trc DODAG Version (DODAGVersionNumber trc) mt khi n cam kt qung b mi DODAG Version.8.2.2.2 ng. DODAG Roots1. Mt DODAG gc khng c kh nng p ng cc application-Mc tiu c xc nh KHNG PHI thit lp cc bit Grounded.2. Mt DODAG gc PHI qung co mt Rank ca ROOT_RANK.3. Mt nt c DODAG m tp rng C TH tr thnh gc DODAG ca mt DODAG ni. N cng c th t DAGPreference ca n nh vy m n t a thch.Trong trin khai c s dng cc lin kt khng LLN lin hip mt s LLN r, n c th chy trn RPL nhng lin kt khng RPL v s dng mtrouter nh mt "xng sng root". Cc gc xng sng l gc r oca DODAG v phi by mt Rank ca BASE_RANK trn xng sng. Tt cr LLN c parented cho rng gc r xng sng, bao gm c ccng trc gc nu n cng phc v nh l gc LLN thn, phi by mt Rankca ROOT_RANK n LLN. Nhng r o l mt phn ca cng mtDODAG v qung b cng DODAGID. H phi hpDODAGVersionNumbers v cc thng s DODAG khc vi th mc gc otrn xng sng. Phng php phi hp l ra khi phm vi cho c im k thut ny (c xc nh trong tng lai ngthng s k thut).

8.2.2.3 S la chn ca DODAG

Nhng chc nng khch quan v tp hp cc s liu nh tuyn qung co vhn ch ca mt DAG nhm xc nh cch mt nt chn tp hng xm ca mnh,b cha m, v cha m a thch. La chn ny cng ngmxc nh DODAG trong vng mt DAG. La chn ny c th bao gms thch hnh chnh (PRF) cng nh cc s liu hoc khccn nhc.Nu mt node c cc ty chn tham gia mt DODAG a thch hn trong khi vnt c mc tiu ti u ha khc, sau nt s thngui vic tham gia DODAG a thch hn theo quyt nh ca OF. Tt c khc bng nhau, n l tri vi vic thc hin xc nhDODAG c a thch nht (v, nh mt li nhc nh, mt nt ch phi tham giamt DODAG mi RPL Instance).8.2.2.4. Rank v Phong tro trong mt Version DODAG1. Mt nt PHI KHNG qung co mt Rank t hn hoc bng bt k thnh vincha ca n t trong Version DODAG.2. Mt nt TH qung co mt Rank thp hn so vi qung co trc y ca ntrong phin bn DODAG.3. Hy L l Rank thp nht trong vng mt bn DODAG rng mt nt cho trc c qung co. Trong cng mt phin bn ca DODAG , nt khng phi qung co xp hng hiu qu cao hn so vi L +DAGMaxRankIncrease. INFINITE_RANK l mt ngoi l cho quy tc ny:mt nt TH qung co mt INFINITE_RANK trong mt Version DODAG khng hn ch. Nu Rank ca mt nt l s cao hn cho php bi L + DAGMaxRankIncrease, khi qung co Rank, nPHI qung co Rank ca n nh INFINITE_RANK.4. Mt nt MAY, bt c lc no, la chn tham gia mt DODAG khc nhau trong mt khong cch ca RPL. Nh mt tham gia khng hn ch Rank, tr khi DODAG khc nhau l mt bn DODAG trong nt ny c trc y c mt thnh vin; trong trng hp , cc quy tc ca cc trang trcn (3) phi c quan st thy. Cho n mt nt truyn mt DIO ch thnh vin DODAG mi ca n, n phi chuyn tip cc gi tin dc theo DODAG trc.5. Mt nt MY, bt c lc no sau khi nghe DODAGVersionNumber tip theo qung co t cha m DODAG ph hp, la chn di chuyn n cc nt tip theo phin bn DODAG trong DODAG.V mt khi nim, mt thc hin c duy tr mt ph huynh tp DODAG trong phin bn DODAG. Phong tro i hi phi thay i cho DODAG b ph huynh. Di chuyn ln khng trnh by cc ri ro to ra mt vng lp nhngdi chuyn xung c th, v vy hot ng l i tng thmhn ch.Khi mt nt di chuyn n phin bn tip theo ca DODAG , nhng DODAG cha me( gc) cn phi c xy dng li vi phin bn mi. S thc hin c thtr hon vic di chuyn cho mt s lng hp l ca thi gian, xem mt snc lng ging khc vi s liu c kh nng tt hn nhng Rank caob mnh. Tng t nh vy, khi mt nt nhy vo mt DODAG mi,n cn phi xy dng mt b DODAG m mi cho DODAG mi ny.Nu mt node cn phi di chuyn xung mt DODAG rng n c gn vo tng Rank ca n, sau n c th u c cc tuyn ng v chm tr ca n trc khidi chuyn nh c m t trong phn 8.2.2.5.Mt nt c php tham gia bt k phin bn DODAG rng n cha bao gi c mt thnh vin trc ca m khng c bt k hn ch, nhng nu cc nt c mtthnh vin trc khi phn phi phin bn DODAG, sau n phi tip tc quan stcc quy tc m n c th khng qung co mt Rank cao hnL + DAGMaxRankIncrease ti bt k thi im no trong cuc sng ca bn DODAG.Quy lut ny phi c quan st khng to ra mt l hng m ccho php cc nt c hiu qu tng Rank ca n tt c cc cch INFINITE_RANK, trong c th c tc ng n cc nt khc v to ra mt ti nguyn lng ph kch bn count-to-v cc8.2.2.5.Hiu ng nhim c 1. Mt nt c tuyn bng cch qung co Xp hng ca INFINITE_RANK.2. Mt nt PHI KHNG c bt k nt vi Xp hng ca INFINITE_RANK trong m ca n thit lp.Mc d mt thc hin c th qung co cho INFINITE_RANK mc ch ca ng c, lm nh vy l khng ging nh thit lp Rank INFINITE_RANK. V d, mt nt c th tip tc gi cc gi d liu m RPL Packet thng tin bao gm Rank khng phi l INFINITE_RANK, nhng vn qung co INFINITE_RANK trong Dios ca n.Khi doanh nghip (c) cha m l quan st qung co cho mt Rank ca INFINITE_RANK, rng (c) ph huynh tch ra t cc DODAG v khng cn c th hnh ng nh mt ngi m, cng khng c cch no m mt nt khc c th c xem xt c mt Rank ln hn INFINITE_RANK. V vy, rng (c) ph huynh khng th hot ng nh mtm lu hn v c ly ra t tp cha m.8.2.2.6. Tch1. Mt nt khng th duy tr kt ni vi mt DODAG trong vng mtphin bn DODAG , v d, rng khng th gi li khng trng b cha m m khngvi phm cc quy nh ca quy chun ny, TH tch t ny DODAG Version. Mt nt tch ra tr thnh gc ca ring mnh ni DODAG v ngay lp tc NN qung co mi nytnh hnh mt DIO nh mt thay th u c.8.2.2.7. Sau Mott khi u1. Nu mt nt nhn c mt DIO t mt trong nhng cha m DODAG ca n,ch ra rng ph huynh ri DODAG, nt NN li DODAG hin ti ca mnh thng qua mt DODAG m thay th, nuc th. N C TH lm theo cha m li.Mt ph huynh DODAG th di chuyn, di c n cc DODAG Version tip theo, hocnhy vt ln mt DODAG khc. Mt nt phi a ra mt s u tin chocn li trong DODAG hin, nu c th thng qua mt ph huynh thay th,nhng phi theo cha m nu khng c la chn khc.8.2.3. Truyn thng DIO nhnKhi mt tin nhn DIO c nhn, cc nt tip nhn phi u tinxc nh c hay khng cc thng ip DIO nn c chp nhn cho x l tip, v sau trnh by s ip cho DIOtip tc x l nu iu kin.1. Nu nhn DIO b thay i, sau tin nhn DIO khng phi l iu kin tip tc x l v mt nt phi m thm b n. (Xem phn 18 li ng nhp).2. Nu ngi gi tin nhn DIO l thnh vin ca cc ng c vin b xm v thng ip DIO l khng d hnh, nt PHI x l DIO.8.2.3.1. DIO nhn ch binKhi hp DIO nhn c t cc nc lng ging ng c vin, nhng ngi hng xm c th c thc y cha m DODAG bng cch lm theo cc quy tc ca DODAG pht hin nh m t trong Phn 8.2. Khi mt nt t mt ngi hng xm vo ph huynh tp DODAG, nt tr nn gn lin vi DODAG thng qua cc nt cha mi DODAG.Ph huynh a thch nht nn c s dng hn ch m khcnt c th tr thnh cha m DODAG. Mt s cc nt trong cc ph huynh tp DODAGc th c mt Rank t hn hoc bng vi DODAG a thch nht cha m. (Trng hp ny c th xy ra, v d, nu mt hn ch nng lngthit b l mt Rank t hn nhng nn trnh mi mt ti u ha,Mc tiu, kt qu l mt ph huynh a thch nhiu hn mt Rank cao hn.)8.S chuyn giao ca DIONt RPL truyn Dios s dng mt b m thi gian gin [RFC6206]. Mt DIO tmt ngi gi vi mt DAGRank t m khng gy nhng thay i trongthit lp ca ngi nhn cha, m a thch, hoc Rank NN coi ph hp i vi cc b m thi gian tia nc vi.Cc gi d liu v cc s kin sau y phi c coi l mu thuni vi cc b m thi gian gin, v vi b m thi gian gy ra tia nc thit lp li:o Khi mt nt pht hin s khng thng nht khi chuyn tip mt gi tin, nhchi tit trong Phn 11.2.o Khi mt nt nhn c mt tin nhn DIS multicast m khng c mt s thu htla chn thng tin, tr khi mt l c DIS hn ch hnh vi ny.o Khi mt nt nhn c mt DIS multicast vi mt thng tin dduojc thu ht la chn v cc nt ph hp vi tt c cc v t trong cc la chn thng tin, tr khi mt l c DIS hn ch hnh vi ny.o Khi mt nt tham gia mt DODAG Version mi (v d, bng cch cp nht ca nDODAGVersionNumber, gia nhp mt RPL Instance mi, vv).Lu rng danh sch ny khng phi l y , v thc hin MAY xem xt cc thng ip hoc cc s kin khc c s mu thun.Mt nt KHNG NN thit lp li b m thi gian DIO tia nc ca n p ng vi unicast.Bn tin DIS. Khi mt nt nhn c mt DIS unicast m khng c mt Solicited La chn thng tin, n PHI unicast mt DIO cho ngi gi trong phn ng.DIO ny phi bao gm mt ty chn DODAG Configuration. Khi mt nt nhn c tin nhn DIS unicast vi mt la chn Solicited Thng tinv ph hp vi cc v t la chn Solicited Thng tin, n PHI unicast mt DIO cho ngi gi trong phn ng. DIO PHI unicast ny bao gm mt ty chn DODAG Configuration. Do , mt nt TH truyn mt unicast DIS tin nhn n mt DODAG m tim nng thm d DODAG cu hnh v cc thng s khc.8.3.1. Cc thng s tia ncCc thng s cu hnh ca b m thi gian tia nc c quy nh nhsau:Imin: hc c t tin nhn DIO l (2 ^ DIOIntervalMin) ms. Ccgi tr mc nh ca DIOIntervalMin l DEFAULT_DIO_INTERVAL_MIN.Imax: hc c t tin nhn DIO nh DIOIntervalDoublings. Ccgi tr mc nh ca DIOIntervalDoublings lDEFAULT_DIO_INTERVAL_DOUBLINGS.k: hc c t tin nhn DIO nh DIORedundancyConstant. Ccgi tr mc nh ca DIORedundancyConstant lDEFAULT_DIO_REDUNDANCY_CONSTANT. Trong RPL, khi k c gi trca 0x00, iu ny c coi l mt hng s thav hn RPL, tc l, tia nc khng bao gi ngn chn tin nhn.8.4. S la chn ca DODAG Vic la chn DODAG l thc hin v OFF ph thuc. m hn ch c ng tht thng, v tt c cc s liu u bng nhau, cc nt SHOULD gi la chn trc y ca h. Ngoi ra, cc nt NN cung cp mt phng tin lc ra mt ph huynh c sn sng c pht hin nh l dao ng bt thng, ti nht l khi s la chn n nh hn c sn.Khi kt ni vi mt DODAG cn c l khng th hoc khng thch hp choan ninh hoc cc l do khc, DODAGs ri rc TH tng hp nhiu nh tt vo DODAGs ln hn cho php kt ni trong phm vi LLN.Mt nt SHOULD xc minh rng kt ni hai chiu v y cht lng lin kt c sn vi mt ngi hng xm ng c vin trc khi n cho rng ng c vin l ph huynh DODAG.8.5. Hot ng nh mt l NodeTrong mt s trng hp, mt nt RPL c th nh km vo mt DODAG nh l mt nt l ch.Mt v d v mt trng hp nh vy l khi mt nt khng hiu hoc khng h tr (chnh sch) ca cc RPL Instance ca qung co hoc s liu /hn ch. Theo quy nh ti mc 18.6, lin quan n chnh schchc nng, cc nt, hoc c th tham gia cc DODAG nh l mt nt l hoc c thkhng tham gia DODAG. Nh cp trong Mc 18.5, l sau khuyn khch ng nhp mt li.Mt nt l khng m rng kt ni DODAG; Tuy nhin, trong mt strng hp, cc nt l vn c th cn phi truyn Dios .c bit, khi cc nt l c th khng lun lun c hot ng nh mtnt l v s khng thng nht c pht hin.Mt nt hot ng nh l mt nt l phi tun theo cc quy tc sau y:1. N KHNG PHI truyn Dios cha DAG Metric Container.2. Dios PHI qung co mt DAGRank ca INFINITE_RANK.3. N C TH n p truyn DIO, tr khi vic truyn DIO cc kch hot do pht hin khng thng nht khi mt gi tin lc chuyn tip hoc phn ng vi tin DIS unicast, trong trng hp vic truyn DIO KHNG PHI c dp tt.4. N C TH truyn DAO unicast nh c m t trong Phn 9.2.5. N C TH truyn DAO multicast cho '1 hop' khu ph nh m t trong Phn 9.10.Mt trng hp c th m i hi phi c mt nt l gi mt DIO l nu nt l l mt thnh vin trc ca mt DODAG v mt nt khcchuyn tip tin nhn gi topo c, gy ra mtkhng thng nht. Cc nt l cn truyn ti mt DIO sa cha s khng thng nht. Lu rng do tnh cht lossy ca LLNs,mc d cc nt l c th lc quan u c cc tuyn ng ca nbng cch qung co Xp hng ca INFINITE_RANK trong DODAG c trctr thnh mt nt l, qung co c th tr thnh b mt v mtnt l phi c kh nng gi mt DIO sau ny sa chakhng thng nht.Trong trng hp chung, cc nt l PHI KHNG qung co chnh n nh l mtb nh tuyn (v d, gi Dios).8.6. Rank hnh chnhTrong mt s trng hp, n c th l c li iu chnh Rank qung cobng mt nt ngoi m tnh bng nhng HNH da trn mt schnh sch v cc thuc tnh ca nt thc hin c th. V d, mt nt m c mt pin c gii hn nn c mt l trkhng c la chn no khc, v sau c th lm tng thm tnh Ranktheo quy nh ca HNH phi by mt Rank phng i.9. Tuyn ng i xungPhn ny m t cch RPL pht hin ra v duy tr i xungcc tuyn ng. RPL xy dng v duy tr cc tuyn ng i xung vi im n Qung co Object (DAO) tin nhn. Cc tuyn ng xungh tr P2MP chy, t r DODAG v pha l. i xungtuyn cng h tr P2P chy: tin nhn P2P c th chy v pha mt DODAGroot (hoc mt t tin chung) thng qua mt ng hng ln, sau i tgc DODAG n mt ch thng qua mt ng i xung.c im k thut ny m t hai ch mt RPL Instance c th chnt cho vic duy tr cc tuyn ng i xung. Trong ch u tin, c gi l"Lu tr", cc nt lu tr bng nh tuyn i xung cho h ph DODAG.Mi hop trn mt tuyn ng i xung trong mt mng lu tr kim tra ca n bng nh tuyn quyt nh bc k tip. Trong ch th hai, gi l"Non-Lu tr", cc nt khng lu tr bng nh tuyn i xung. i xungcc gi tin c nh tuyn vi cc tuyn ng ngun dn c ca mt gc DODAG[RFC6554].RPL cho php mt one-hop ti u ha P2P n gin cho c lu tr vcc mng khng c lu tr. Mt nt c th gi mt gi tin P2P mnh mtone-hop hng xm trc tip n nt .9.1. im n Qung co Parents thit lp cc tuyn ng i xung, cc nt RPL gi tin nhn DAO Tr ln.Cc im n tip theo-hop ca nhng tin nhn DAO c gi l "DAO cha m ". Cc b su tp ca cha m DAO ca mt nt c gi l" DAO b cha m ".1. Mt nt TH gi tin nhn bng cch s dng tt c cc O-RPL-node multicasta ch, l ti u ha cho mt-hp cng routing.Cc bit 'K' PHI c xa trn truyn ca DAO multicast.DAO m set 2. A ca nt phi l mt tp hp con ca tp DODAG cha ca n.3. Trong lu tr ch hot ng, mt nt PHI KHNG gii quyt DAO unicast cc tin nhn n cc nt ang khng dao cha m.4. Lu tr ch hot ng, ngun IPv6 v cha ch ca mt thng ip DAO PHI l a ch link-local.5. Trong Non-Lu tr ch hot ng, mt nt PHI KHNG gii quyt unicast Thng DAO cc nt ang khng DODAG r.6. Trong ch khng hot ng bo qun, ngun IPv6 v cha ch ca mt thgAO PHI l mt c o-a phng hoc a ch ton cuVic la chn ca cha m DAO l thc hin v v ch nang khch quan c th.

9.2Khm ph Router i xuong v s duy trS cng khai ch c th c cu hnh c hon ton b v hiu ha,hoc hot ng mt bo qun hoc ch khng lu tr, theo nh boMOP trong tin nhn DIO.1. Tt c cc nt ngi tham gia mt DODAG PHI tun theo cc thit lp MOP troot. Cc nt m khng c kh nng tham gia y nh mt b nh tuyn, v d, rng khng ph hp vi MOP c qung co, C TH tham giacc DODAG nh mt chic l.2. Nu MOP l 0, cho thy khng c nh tuyn i xung, cc nt Khng phitruyn ti thng ip DAO v C TH b qua tin nhn DAO.3. Trong khng lu tr ch , gc DODAG NN lu tr d liu nh tuynmc bng cho khu hc t DAO. Cc gc DODAGPhi c kh nng to ra cc tuyn ng ngun cho nhng khu hc t DAO c lu tr.4. Trong ch lu tr, tt c khng phi root, cc nt l khng phi lu tr nh tuyn mc bng cho khu hc t DAO.Mt DODAG th c mt trong mt s ch c th hot ng, nhc xc nh bi trng MOP. Hoc l n khng h tr Xung cc tuyn ng, n h tr cc tuyn ng i xung thng qua nh tuyn ngun t DODAG r, hoc n h tr cc tuyn ng i xung thng qua cc mng nh tuynbng.Khi tuyn ng i xung c h tr thng qua nh tuyn ngun t DODAG r, n thng c d kin rng gc DODAG c lu tr ngun thng tin nh tuyn hc c t DAO xy dng cc tuyn ng ngun. Nu gc DODAG khng lu tr mt sthng tin, sau mt s im n c th truy cp c.Khi tuyn ng i xung c h tr thng qua cc mng li cc bng nh tuyn,cc hot ng a hng c nh ngha trong c t ny c th hoc khng c h tr, cng nh c ch ra bi trng MOP.Khi tuyn ng i xung c h tr thng qua cc mng li cc bng nh tuyn,nh c m t trong c t ny, l mong rng din xut ca cc nt nh cc router c cp gi cc yu cunh tuyn trng thi bng. Nu mt nt hot ng nh mt b nh tuyn l khng th gi trng thi bng nh tuyn y th nh nc nh tuyn khng hon chnh,tin nhn c th c gim xung nh mt h qu, v mt li c th c ng nhp(Mc 18.5). Phn m rng trong tng lai RPL c th xy dng trn tinh chhnh ng / hnh vi qun l trng hp ny.Theo cc vn bn ca cc c im k thut ny, RPL khng h tr mixed-ch hot ng, ni mt s tuyn ng nt ngun v ca hng nh tuyn khc-bng: phn m rng trong tng lai c th h tr RPL ch ny hot ng.9.2.1. Bo tr ng dn trnh ti vi mi mc tiu l lin kt vi (thuc) mt node, node l trch nhim pht ra thng ip DAO cung cp khc.Cc tuyn ng xung. Cc thng tin Target + Transit cha trong nhng tin nhn DAO sau lan truyn Up DODAG. Sequence ng dntruy cp vo cc ty chn thng tin Transit c s dng ch rati mi v cp nht thng tin nh tuyn c i xung nh m tti Mc 7.i vi mt mc tiu l lin kt vi (thuc) mt node, nodePHI tng quy ng dn trnh t, v to ra mt DAO mitin nhn, khi:1. Lifetime Path l c cp nht (v d, lm mi hoc mt khng-Path).2. Danh sch a ch Parent trng con DODAG l phi c thay i.i vi mt mc tiu l lin kt vi (thuc) mt nt, nt THNG tng quy ng dn trnh t, v to ra mt thng ip DAO mi,dp lm mi cc thng tin nh tuyn i xung. Trongch lu tr, nt to ra mt DAO nh vy mi DAO ca mnhcha m cho php a ng. Tt c DAO to ra ti cng mtthi gian cho cc mc tiu tng t phi c gi vi cc trnh t trong cng mt con ngchuyn tip thng tin.9.2.2. Th h ca tin nhn DAOMt nt c th gi tin nhn DAO khi n nhn c tin nhn DAO, nh mt kt qu ca nhng thay i trong thit lp DAO m ca n, hoc phn ng vi nhau s kin nh ht hn ca mt tin t cuc i lin quan. Trong trng hp nhn DAO, n quan trng cho d thng ip DAO l "mi" hoccha thng tin mi. Trong khng lu tr ch , mi DAO nhn mt nt nhn l "mi". Trong ch lu tr, mt tin nhn DAO l "mi" nu n p ng bt k cc tiu ch cho mt mc tiu c cha:1. n c mt s dy con ng mi hn,2. n c thm bit ng dn Control, hoc ma ng,,vn vn,,,,3. n l mt thng ip DAO No-Path m loi b cc tuyn ng i xung cui cng mt tin t.Mt nt m nhn c mt tin nhn t DAO ca n ph DODAG TH n plch mt thng ip truyn DAO nu nhn DAO khng phi l mi.9.3. DAO Rules c s1. Nu mt nt gi mt thng ip DAO vi thng tin mi hn, hay khc nhau hn cc thng ip truyn DAO trc, n PHI gia tnglnh vc DAOSequence bi t nht mt. Mt thng ip truyn DAO l ging ht nhau truyn ti thng ip DAO trc THNGtng trng DAOSequence.2. Cc trng RPLInstanceID v DODAGID ca mt thng ip DAO PHI l cng mt gi tr nh cc thnh vin ca cng ty m tp ca nt v cc Diosn truyn ti.3. Mt nt TH t c 'K' trong mt thng ip unicast DAO thu ht mtunicast DAO-ACK trong phn ng xc nhn vic th.4. Mt node nhn c mt thng ip unicast DAO vi 'K' flagNN p ng vi mt DAO-ACK. Mt node nhn c tin nhn DAOkhng c 'K' flag TH p ng vi mt DAO-ACK, c bitbo co tnh trng li.5. Mt nt m b c 'K' trong mt thng ip unicast DAO nhng khng nhn c mt DAO-ACK phn ng TH sp xp li cc thng DAOtruyn cho mt n lc khc, cho n khi mt implementation-s c th ca ln th li.6. Cc nt NN b qua DAO m khng s th t mi hn v MUSTKHNG x l chng hn na.Khng ging nh cc lnh vc bn ca mt DIO, m ch c gia tng bi mtGc DODAG v lp i lp li khng thay i bi cc nt, cc gi tr DAOSequence khcl duy nht cho mi nt. Khng gian s th t cho unicast vthng ip multicast DAO c th l ging nhau hoc khc nhau. N l RECOMMENDED s dng khng gian s th t nh nhau.9.4. Cu trc ca tin nhn DAODAO theo mt cu trc ph bin c lu tr v khng lu tr trn mng. Trong cc hnh thc chung nht, mt tin nhn DAO c th bao gm mt vi nhm ty chn, trong mi nhm bao gm mt hoc nhiu la chn mc tiu theo sau bi mt hoc nhiu tu chn thng tin Transit.Ton b nhm cc ty chn thng tin Transit p dng cho ton bcc nhm chn Target. Phn sau s m t chi tit chomi phng thc hot ng.1. nt RPL PHI bao gm mt hoc nhiu ty chn RPL mc tiu trong mi DAO thng ip m h truyn ti. Mt la chn RPL Target phi c mt tin t bao gm a ch IPv6 ca nt nu nt cn DODAG cung cp cc tuyn ng i xung n nt . Cc RPL Target ty chn C TH c ngay lp tc theo sau bi mt RPL Target cla chn m t ng cc tiu ch .2. Khi mt nt cp nht cc thng tin trong mt thng tin Transit la chn cho mt la chn mc tiu bao gm mt trong cc a ch ca n, n PHI tng s ng dn trnh t trong TransitLa chn thng tin. S ng dn trnh t C TH c tng ln i khi gy ra mt refresh cc tuyn ng i xung.3. Mt hoc nhiu ty chn RPL mc tiu trong mt thng ip unicast DAO PHItheo sau bi mt hoc nhiu tu chn Thng tin Transit. Tt cty chn vn chuyn p dng cho tt c cc ty chn Target m ngay lp tc i trc h.4. DAO Multicast PHI KHNG bao gm cc DODAG Chnh a ch trng controng cc ty chn thng tin Transit.5. Mt nt nhn v x l tin nhn DAO cha thng tin cho mt mc tiu c th, v c thng tin trccho mc tiu , phi s dng s lng ng dn trnh t trong Transit la chn cc thng tin lin quan n mc tiu xc nh c hay khng cc thng ip DAO cha cp nht thng tin cho mi mc 7.6. Nu mt nt nhn c mt tin nhn DAO m khng tun theo cc trn quy tc, n phi loi b cc tin DAO m khng cn thmch bin.Trong khng lu tr ch , gc xy dng mt tiu nh tuyn ngun nghim ngt,hp-by-hp, bng cch quy tm ln mt-hp thng tin rng quan h mt Target (a ch hoc tin t) v mt a ch qu cnh vi nhau. Trong mt s trng hp, khi mt a ch con c ngun gc t mt tin t c s hu v c qung co bi cha m, rng mi quan h cha-con c th suy ra bi cc gc cho cc mc ch xy dng cc ngun tiu nh tuyn. Trong tt c cc trng hp khc, n l cn thit thng bo chogc r ca mi quan h qu cnh-Target t mt mc tiu c th truy cp, v vy sau ny cho php xy dng quy ca tiu nh tuyn.Mt a ch c qung co nh l mt mc tiu trong mt thng ip DAO PHI sp xp trong cng mt router, hoc c th truy cp vo lin kt bi cc b nh tuyn s hu cc a ch c ch nh trong cc Transit thng tin lin quan. Cc quy nh b sung sau y c p dng m botnh lin tc ca con ng ng ngun end-to-end:1. a ch ca mt ph huynh s dng trong cc ty chn qu cnh phi c thc hint mt PIO t ph huynh vi 'R' flag. Cc 'R' ctrong mt PIO ch ra rng trng tin t thc s c cha cca ch m y nhng con KHNG NN gi nh rng a ch m l trn-link.2. Mt PIO bng 'A' flag ch ra rng cc nt con RPL th s dng tin t autoconfigure mt a ch. Mt ph huynh qung co mt tin t trong mt PIO vi 'A' flag PHI m borng a ch hoc ton b tin t trong PIO c th truy cp tgc bng cch qung co n nh l mt mc tiu DAO. Nu ph huynh cng t 'L' c ch ra rng cc tin t l on-link, sau nPHI qung co ton b tin t nh mc tiu trong mt thng ip DAO. Nu cc 'L' c c xa v 'R' c c thit lp, ch ra rng ph huynh cung cp a ch ring ca mnh trong PIO, sau ph huynhPHI qung co rng a ch nh l mt mc tiu DAO.3. Mt a ch c qung co nh l mc tiu trong mt thng ip DAO PHi collocated trong cng mt router hoc c th truy cp vo lin kt bi cc b nh tuyns hu cc a ch c ch nh trong cc thng tin lin quan ti Transit 4. kch hot mt nn ti u ca tiu nh tuyn,ph huynh NN thit lp 'R' c trong tt c PIOs vi 'A' thit lp v 'L' c xa, v a tr NN thch s dngnh chuyn a ch ca ph huynh c tm thy trong cc PIOc s dng autoconfigure a ch c qung co lnhm mc tiu trong tin nhn DAO.5. Mt router c th c nhng mc tiu m khng c bit n l trn-link cho l cha m, hoc v h l nhng a ch nm trn mt giao din thay th hoc v h thuc v cc nt cbn ngoi RPL, v d kt ni vi my ch. m c mt mc tiu nh vy trong mng RPL, router PHI qung co mnh l DODAG a ch Parent trng con trong Transit ty chn thng tin cho mc tiu , bng cch s dng mt a ch ml trn-link cho rng cc nt DAO m. Nu mc tiu thuc v mt nt bn ngoi, sau router phi thit lp c ngoi 'E' trong Thng tin Transit.Mt nt con t cu hnh mt a ch t mt ph huynh PIO vi 'L' c t khng cn phi qung co m a ch nh l mt DAO Target k t khi cha m m bo rng ton b tin t l truy cp t gc. Tuy nhin, nu cc 'L' c khng c thit lp, sau n l cn thit, trong ch Non-Tng tr, cho cc nt con thng bogc r ca mi quan h cha-con, bng cch s dng mt a ch c th truy cpca ph huynh, gip xy dng quy chiu tiu nh tuyn. iu ny c thc hin bng cch kt hp mt a ch ca ph huynhnh cnh hng ha vi cc a ch ca cc con nh l mc tiu trong mt tin nhn DAO.9.5. Scheduling DAO TransmissionBi v DAO chy hng ln, nhn mt DAO unicast c th kch hot gimt DAO unicast cho cha m DAO.1. Khi nhn c tin nhn DAO unicast vi thng tin cp nht, chng hn nh c cha mt la chn thng tin Transit vi mt con ng theo trnh t mi, mt nt NN gi mt DAO. N KHNG NN gi DAO nynhn ngay lp tc. N NN tr hon vic gi tin nhn trong O tng hp thng tin O t cc nt khc m nl mt ph huynh DAO.2. Mt nt NN tr hon vic gi tin nhn DAO vi mt gi (DelayDAO).S Nhn tin t DAO bt u hn gi DelayDAO.Thng DAO nhn c trong khi b m thi gian DelayDAO ang hot ng khng ci t li thi gian. Khi thi gian DelayDAO ht hn, cc nt gi mt O.3. Khi mt nt b sung thm mt nt DAO m thit lp ca n, n NN lchmt thng ip truyn DAO.Gi tr v tnh DelayDAO l thc hin ph thuc. Mtgi tr mc nh ca DEFAULT_DAO_DELAY c nh ngha trong c t ny.9.6. Tin nhn kch hot DAOCc nt c th kch hot ca h ph DODAG gi tin nhn DAO. Mi ntduy tr mt Trigger DAO Sequence Number (DTSN), m n giao tipthng qua tin nhn DIO.1. Nu mt nt nghe mt trong nhng cha m DAO ca n tng DTSN ca n, lnt phi sp xp mt thng ip truyn DAO s dng quy tc trongPhn 9.3 v 9.5.2. Trong khng lu tr ch , nu mt nt nghe mt trong nhng cha m ca n DAOtng DTSN ca n, nt PHI tng DTSN ring ca mnh.Trong mt ch lu tr hot ng, nh l mt phn ca bng nh tuyn thng thng cp nht v bo tr, mt nt lu tr TH tng DTSN trong trt t ng tin cy kch hot mt tp hp cc thng tin cp nht DAO t con mt ca n.Trong mt ch lu tr hot ng, n khng phi l cn thit kch hot DAOcp nht t cc ph bn DODAG, t thng tin nh nc stuyn truyn hop-by-hop Up DODAG.Trong mt ch khng lu tr cc hot ng, tng DTSN cng s gy racon mt ca mt nt tng DTSN ca h ln lt,gy ra mt tp hp cc thng tin cp nht DAO t ton b tiu DODAG.Thng thng, trong mt ch khng lu tr hot ng, ch gc sc lp increment DTSN khi lm mi DAO l cn thit nhng mtsa cha ton cu (chng hn nh bng cch tng DODAGVersionNumber) khng phi lmong mun. Thng thng, trong mt ch khng lu tr hot ng, tt c khng phi root nt s tng DTSN ca h ch khi cha m ca h (s) l quan st lm nh vy.Ni chung, mt nt c th kch hot cp nht DAO theo thc hin c th logic, chng hn nh da trn nhng pht hin ca mtTuyn ng khng thng nht gim hay i khi da trn mt ni bhn gi.Trong mt mng lu tr, la chn mt DelayDAO thch hp cho O kch hot rt c th lm gim s lng O truyn. Chy trigger Xung DODAG; trong trng hp tt nht, DAO chy Up DODAG nh vym l gi DAO u tin, vi mi nt gi tin nhn DAO ch mt ln. Mt lch trnh nh vy c th c xp x bng cch thit lp DelayDAO t l nghch vi Rank. Lu rng ngh ny c d nh nh l mt ti u ha cho php kt hp hiu qu (n l khng cn thit cho hot ng chnh xc trong trng hp chung).9.7. Non-Lu tr Ch Trong ch khng lu tr, RPL tuyn thng ip i xung bng cch s dng ngun IPnh tuyn. Cc quy tc sau p dng cho cc nt c trong Non-Lu tr ch . Ch lu tr c mt b ring bit ca quy tc, c m t trong Mc 9.8.1. DODAG a ch Parent trng con ca mt la chn thng tin Transit PHI cha mt hoc nhiu a ch. Tt c nhng a ch PHI c a ch ca cha m DAO ca ngi gi.2. DAO c gi trc tip vo th mc gc cng mt tuyn ng mc nhci t nh mt phn ca s la chn ca ph huynh.3. Khi mt nt xa mt nt t DAO m thit lp ca n, n THNGto ra mt thng ip DAO mi vi thng tin cp nht Transitty chn. Trong khng lu tr ch , mt nt s dng DAO bo co cha m DAO ca n gc DODAG. Cc gc DODAG c th mnh vi nhau mt con ng i xung n mt nt bng cch s dng DAO cha m t ra t mi nt trong cc tuyn ng. Cc thng tin ng dn trnh t c th c s dng pht hin thng tin c ca DAO .Mc ch ca vic tnh ton l trnh mi hp ny l gim thiu lu lng khi cha m O thay i. Nu nt bo co hon chnh tuyn ng ngun, sau vo mt s thay i DAO ph huynh, ton b ph DODAGs phi gi DAO mi vo th mc gc DODAG. V vy, trongkhiCh lu tr, mt nt c th gi mt DAO duy nht, mc d n c th chngi nhiu tin nhn DAO tng nhiu cha DAO.Cc nt ng gi DAO bng cch gi tin nhn DAO duy nht vi nhiu RPLTy chn Target. Mi la chn RPL Target c ring ca mnh, ngay lp tcsau y, ty chn Thng tin Transit.9.8. Ch lu trTrong ch lu tr, RPL tuyn thng ip i xung bi ch n a ch IPv6. Cc quy nh sau y p dng cho cc nt c trong lu trch :1. DODAG a ch Parent trng con ca mt thng tin Transmit c la chn phi c sn phm no.2. Khi nhn c mt DAO unicast, mt nt phi tnh ton nu DAO s thay i cc thit lp ca cc tin t chnh nt qung co. iu nytnh ton NN bao gm t vn ca cc dy ngthng tin trong cc ty chn lin quan n thng tin TransitDAO, xc nh xem cc tin DAO cha mi hnthng tin thay th cc thng tin c lu tr tinode. Nu vy, cc nt phi to ra mt thng ip mi v DAOtruyn ti n, theo cc quy nh ti mc 9.5. Mt s thay i nh vybao gm nhn mt O N-Path.3.Khi mt nt to ra mt O mi, n NN unicast n micha m O ca n. N KHNG PHI unicast thng ip DAO hch m khng phi l o cha m.4. Khi mt nt xa mt nt t DAO m thit lp ca n, n NN gi tin nhn Khng-Path DAO (mc 6.4.3) cho rng DAO xa ph huynh lm mt hiu lc cc tuyn ng hin c.5. Nu thng ip n mt a ch i xung c qung co b mt giao nhn li, Neighbor Unreachable Detection (NUD), hoctht bi tng t, mt nt TH nh du cc a ch nh khng th truy cp vto ra mt DAO No-Path thch hp.DAO qung co m a ch ch v tin t mt nt c cc tuyn ng. Khng ging nh trong ch khng lu tr, cc DAO khng giao tip thng tin v cc tuyn ng chnh mnh: thng tin c lu tr trong mng v l tim n t cc ngun a ch IPv6.Khi mt nt lu tr to ra mt DAO, n s dng cc trng thi lu tr ca DAO,n nhn c to ra mt tp hp cc ty chn v RPL Target ca h ty chn lin quan Transmit Thng tin.Bi v thng tin ny c lu tr trong bng nh tuyn ca mi nt,trong ch lu tr, DAO c truyn t trc tip cho cha m DAO, ngilu tr thng tin ny.9.9. ng dn iu khinMt tin nhn DAO t mt nt cha mt hay nhiu ty chn Target. MimtTarget ch nh hoc l mt tin t c qung co bi cc node, mtprefix ca a ch c th bn ngoi LLN, a ch ca mtch trong ca nt ph DODAG, hoc mt nhm multicast m mt nt trong sub-DODAG ang lng nghe. Cc lnh vc ng Kim sot caThng tin la chn Transit cho php cc nt yu cu hoc cho php nhiu tuyn ng i xung. Mt nt xy dng cc lnh vc ng dn iu khin ca mt la chn thng tin Transit nh sau:1. Chiu rng bit ca trng ng dn kim sot phi c bnh ng vigi tr (PCS + 1), ni PCS c quy nh trong lnh vc kim sot caty chn DODAG Configuration. Bit ln hn hoc bnggi tr (PCS + 1) phi c xa trn truyn v phi cb qua khi tip nhn. Bit thp hn gi tr c coi l Bit "hot ng".2. Cc nt PHI logic xy dng nhm ca cha m DAO ca n trong khi dn c lnh vc ng dn Control, trong mi nhmbao gm cha m DAO u tin bng nhau. Nhng nhm MUSTsau c t hng theo s thch, cho php mtlp bn logic ca cha m DAO vo trng con ng iu khin (xemHnh 27). Nhm C TH c lp i lp li m rng trnton b chiu rng bit ca trng iu khin v, nhng th t,bao gm cc nhm lp i lp li, phi c gi li u tin lthng bo ng n.3 i vi mt la chn RPL Target m t a ch ca ring ca mt nt hoc mttin t bn ngoi LLN, t nht l mt cht tch cc ca con ng.Lnh vc kim sot phi c thit lp. Bit tch cc hn ca Control ng dnlnh vc TH c thit lp.4. Nu mt nt nhn c nhiu DAO bng ty chn RPL Target cng,n PHI bitwise OR cc lnh vc kim sot con ng m n nhn c. iu nyc tng hp bitwise OR i din cho s tuyn i xung cc yu cu tin t.5. Khi mt nt gi mt thng ip DAO mt trong nhng cha m DAO ca n, nPHI chn mt hoc nhiu ca cc bit c thit lp hot ng trongtrng con l nh x ti cc nhm c cha DAO mt lnh vc ng dn iu khin tng hp. Mt cht a ra ch c th ctrnh by nh l hot ng cha m tr. Cc tin DAO n truyn ti cha m ca n phi c cc hot ng thit lp bit v tt c ccbit hot ng xa.6. i vi cc ty chn RPL Target v DAOSequence s, DAO mt nt gi cho cha m DAO khc nhau phi c b tch ri ca hot ngBit ng dn Control. Mt nt KHNG PHI thit lp cc bit hot ng trn cng mt DAO hai cha m DAO khc nhau.7. bt ng dn iu khin NN c phn b theo s thchlp bn ca cha m O vo trng con ng dn Control, nh vy m bt hot ng ng dn Control, hoc cc nhm bit, m thuc v mtc bit trng con ng iu khin c phn b cho o cha mtrong nhm c nh x ti trng con m. 8.Trong mt ch khng lu tr hot ng, mt nt C TH vt qua DAO quam khng thc hin vic x l thm v kim sot con nglnh vc.9. Mt nt PHI KHNG unicast nhn DAO m khng c bit hot ng lnh vc ng dn iu khin thit lp. C th l, i vi mt nhTu chn Target, mt nt khng c ng dn iu khin tng hpbit gi mt tin nhn c cha DAO Target mi mnhCha m DAO, trong trng hp nhng ngi a thch nht DAO Cha m c thkhng nhn c tin nhn DAO cho mc tiu .Cc lnh vc ng dn Control cho php mt nt rng buc bao nhiu i xungng bay mi s c to ra vi n. N t ra mt s bit trong PathTrng iu khin bng s lng ti a ca cc tuyn ng i xung thch. Ti hu ht, mi bit c gi n mt DAO m; cmbit c th c gi cho cha m DAO duy nht cho n phn chia gia ca ncha m DAO ring.Mt nt quy nh mt l trnh DAO cho mt mc tiu m c mtlnh vc ng Kim sot lin NN s dng cc ni dung ca con ng Lnh vc kim sot xc nh mt th t u tin gia ccnhiu tuyn ng DAO thay th cho mc tiu . Control ng dnphn cng lnh vc c ngun gc t s thch (ca cha m O), nhxc nh trn c s kin thc tt nht ca nt ny ca "end-to- kt thc "cc s liu tng hp theo hng i xung theo Chc nng quan. Trong ch khng bo qun gc c th xc nhng xung bng cch tp hp cc thng tin t mi nhn DAO,trong bao gm cc ch dn ng kim sot ca cha m DAO a thch.9.9.1. ng dn iu khin V dGi s rng c mt LLN hot ng ch c cha lu trmt N Node vi bn cha m, P1, P2, P3, v P4. Hy N c batr em, C1, C2, C3 v trong ca n ph DODAG. Hy PCS l 7, nh vy ms c 8 bit hot ng trong lnh vc kim sot Path: 11111111b.Xt v d sau:Cc lnh vc ng dn iu khin c chia thnh bn trng con, PC1 (11000000b),PC2 (00110000b), PC3 (00001100b), v PC4 (00000011b), nh vy mbn trng con i din cho bn cp khc nhau v s thch mi Hnh 27. Vic thc hin ti Node N, trong v d ny, cc nhm {P1, P2} c u i bnh ng vi nhau v hu hta thch chung ca nhm. {} P3 l t a thch {P1, P2}, v nhiu hn nathch {P4}. Hy Node N sau thc hin lp bn ng kim sot ca mnhnh vy m:

{P1, P2} -> PC1 (11000000b) trong lnh vc ng dn iu khin{P3} -> PC2 (00110000b) trong lnh vc ng dn iu khin{P4} -> PC3 (00001100b) trong lnh vc ng dn iu khin{P4} -> PC4 (00000011b) trong lnh vc ng dn iu khin

Lu rng vic thc hin lp i lp li {P4} c c y vng ph sng ca cc lnh vc ng dn Control.1. Hy C1 gi mt DAO cha mt Target T vi mt iu khin ng dn10000000b. Node N ca hng mt mc lin kt vi 10000000b lnh vc ng dn iu khin cho C1 v Target T.2. Hy C2 gi mt DAO cha mt Target T vi mt iu khin ng dn00010000b. Node N ca hng mt mc lin kt vi 00010000blnh vc ng dn iu khin cho C1 v Target T.3. Hy C3 gi mt DAO cha mt Target T vi mt iu khin ng dn00001100b. Node N ca hng mt mc lin kt vi 00001100blnh vc ng dn iu khin cho C1 v Target T.4. Ti mt s thi gian sau , Node N to mt DAO cho Target T. Node Ns xy dng mt trng ng dn iu khin tng hp bi ORING cngs ng gp ca mi ngi con ca mnh a ra mt DAOcho Target T. Do , cc lnh vc ng dn iu khin tng hp cbit hot ng thit lp nh: 10011100b 5. Node N sau phn phi cc bit ng dn kim sot tng scha m ca n P1, P2, P3, P4 v chun b DAOtin nhn.6. P1 v P2 c iu kin nhn c bit hot ng t nhiu nhttrng con a thch (11000000b). Nhng bit c 10000000b trongtng hp lnh vc ng dn Control. Node N phi thit lp cc bit n mt trong hai cha m ch. Trong trng hp ny, Node P1 c phn bbit v c cc lnh vc ng dn iu khin 10000000b cho O ca n.Khng c cc bit cn li phn b cho Node P2; do , Node P2s c mt lnh vc ng kim sot ca 00000000b v mt DAO khng thto ra Node P2 v khng c bit hot ng.7. Cc trng con nhiu th nh a thch (00110000b) c cc hot ngbit 00010000b. Node N nh x P3 n trng con ny. Node Nc th phn b cc bit hot ng P3, xy dng mt DAO cho P3cha Target T vi mt iu khin Path of 00010000b.8. Cc trng con th ba nht a thch (00001100b) c cc hot ngbit 00001100b. Node N nh x P4 n trng con ny. Node Nc th phn b c hai bit P4, xy dng mt DAO cho P4 cha Target T vi mt iu khin Path of 00001100b.9. Cc trng con a thch nht (00000011b) khng c bit hot ng. c c bit hot ng, nhng bit c th c thm volnh vc ng kim sot ca DAO xy dng cho P4.10. Qu trnh tng dn c thng ip DAO mnh cho P1, P2,P3, P4 vi cc mc tiu khc (tr T) x l tu theocc lnh vc ng dn iu khin tng hp thu thp cho cc mc tiu .9.10. Multicast Destination Qung co Tin nhnMt trng hp c bit ca hot ng DAO, phn bit vi hot ng DAO unicast,l hot ng multicast DAO m c th c s dng c '1-hop'entry bng nh tuyn.1. Mt nt TH multicast nhn DAO phm vi link-local tt c cc-RPL-nt a ch multicast.2. Mt thng ip multicast DAO PHI c ch c s dng qung cothng tin v nt chnh n, tc l, tin t trc tipkt ni hoc thuc s hu ca cc nt, chng hn nh mt nhm multicast mcc nt c k kt hoc mt a ch ton cu thuc s hu ca cc nt.2. Mt thng ip multicast DAO KHNG PHI c s dng chuyn tip kt nithng tin hc (v d, thng qua DAO unicast) t khcnode.4. Mt nt KHNG PHI thc hin bt k ch bin DAO lin quan khc trn nhn c tin nhn multicast DAO; c bit, mt nt PHI KHNG thc hin cc hnh ng ca cha m DAO khi nhn c mt multicast DAO. Cc DAO multicast c th c s dng cho php truyn thng P2P trc tip, m khng cn cc DODAG chuyn tip cc gi tin.