Niaj hnub no peb yuav pib kawm EIGRP raws tu qauv, uas, nrog rau kev kawm OSPF, yog lub ntsiab lus tseem ceeb tshaj plaws ntawm chav kawm CCNA.
Peb yuav rov qab mus rau Tshooj 2.5 tom qab, tab sis tam sim no, txoj cai tom qab Tshooj 2.4, peb yuav tsiv mus rau Tshooj 2.6, "Configuring, Verifying, and Troubleshooting EIGRP over IPv4 (tsis suav nrog Kev lees paub, Lim, Phau Ntawv Qhia, Kev xa rov qab, thiab Stub Configuration). "
Hnub no peb yuav muaj ib zaj lus qhia uas kuv yuav qhia koj txog lub tswv yim ntawm Enhanced Internal Gateway Routing Protocol EIGRP, thiab hauv ob zaj lus qhia tom ntej no peb yuav saib txog kev teeb tsa thiab teeb meem cov txheej txheem cov neeg hlau. Tab sis ua ntej kuv xav qhia rau koj hauv qab no.
Ob peb tshooj dhau los peb tau kawm txog OSPF. Tam sim no kuv xav kom koj nco ntsoov tias thaum peb saib RIP ntau lub hlis dhau los, peb tau tham txog routing loops thiab thev naus laus zis uas tiv thaiv kev khiav tsheb los ntawm kev voj voog. Koj tuaj yeem tiv thaiv routing loops li cas thaum siv OSPF? Nws puas tuaj yeem siv txoj hauv kev xws li Route Poison lossis Split Horizon rau qhov no? Cov no yog cov lus nug uas koj yuav tsum teb rau koj tus kheej. Koj tuaj yeem siv lwm cov kev pabcuam thematic, tab sis nrhiav cov lus teb rau cov lus nug no. Kuv xav kom koj kawm paub yuav ua li cas thiaj nrhiav tau cov lus teb koj tus kheej los ntawm kev ua haujlwm nrog ntau qhov chaw, thiab kuv xav kom koj tawm koj cov lus hauv qab no video kom kuv thiaj li pom tias kuv cov tub ntxhais kawm tau ua tiav txoj haujlwm no li cas.
EIGRP yog dab tsi? Nws yog hybrid routing raws tu qauv uas sib txuas cov yam ntxwv tseem ceeb ntawm ob qho tib si vector raws tu qauv xws li RIP thiab ib qho txuas-xeev raws tu qauv xws li OSPF.
EIGRP yog Cisco proprietary raws tu qauv uas tau tsim muaj rau pej xeem nyob rau hauv 2013. Los ntawm qhov txuas-xeev kev taug qab raws tu qauv, nws tau txais ib lub zej zog tsim algorithm, tsis zoo li RIP, uas tsis tsim cov neeg nyob ze. RIP kuj pauv cov rooj sib tham nrog lwm tus neeg koom nrog hauv cov txheej txheem, tab sis OSPF tsim ib qho chaw nyob ua ntej pib qhov kev sib pauv no. EIGRP ua haujlwm ib yam nkaus.
RIP raws tu qauv ncua sij hawm hloov kho tag nrho cov lus qhia txhua 30 vib nas this thiab faib cov ntaub ntawv hais txog txhua qhov kev sib tshuam thiab txhua txoj hauv kev rau txhua tus neeg nyob ze. EIGRP tsis ua txhua lub sijhawm hloov tshiab ntawm cov ntaub ntawv, es tsis txhob siv lub tswv yim ntawm kev tshaj tawm nyob zoo cov lus zoo ib yam li OSPF ua. Txhua txhua ob peb vib nas this nws xa ib tug nyob zoo kom paub tseeb tias tus neeg nyob ze tseem " ciaj sia."
Tsis zoo li cov txheej txheem vector nyob deb, uas tshuaj xyuas tag nrho cov network topology ua ntej txiav txim siab los tsim ib txoj hauv kev, EIGRP, zoo li RIP, tsim txoj hauv kev raws li cov lus xaiv. Thaum kuv hais lus xaiv, kuv txhais tau tias thaum ib tus neeg nyob ze tshaj tawm ib yam dab tsi, EIGRP pom zoo nrog nws yam tsis muaj lus nug. Piv txwv li, yog tias ib tug neeg nyob ze hais tias nws paub yuav ua li cas mus txog 10.1.1.2, EIGRP ntseeg nws yam tsis tau nug, "Koj paub li cas? Qhia kuv txog topology ntawm tag nrho lub network!
Ua ntej xyoo 2013, yog tias koj siv Cisco nkaus xwb, koj tuaj yeem siv EIGRP, txij li cov txheej txheem no tau tsim rov qab rau xyoo 1994. Txawm li cas los xij, ntau lub tuam txhab, txawm tias siv cov cuab yeej Cisco, tsis xav ua haujlwm nrog qhov sib txawv no. Hauv kuv lub tswv yim, EIGRP yog qhov zoo tshaj plaws dynamic routing raws tu qauv niaj hnub no vim nws yooj yim dua rau siv, tab sis tib neeg tseem nyiam OSPF. Kuv xav tias qhov no yog vim qhov tseeb tias lawv tsis xav muab khi rau Cisco cov khoom. Tab sis Cisco tau ua cov txheej txheem no rau pej xeem vim nws txhawb nqa cov cuab yeej sib txuas thib peb xws li Juniper, thiab yog tias koj koom nrog lub tuam txhab uas tsis siv cov cuab yeej Cisco, koj yuav tsis muaj teeb meem.
Cia wb mus ncig ua si luv luv rau hauv keeb kwm ntawm cov txheej txheem network.
RIPv1 raws tu qauv, uas tshwm sim nyob rau hauv 1980s, muaj ib tug xov tooj ntawm cov kev txwv, piv txwv li, ib tug ntau ntawm cov hops ntawm 16, thiab yog li ntawd tsis muaj peev xwm muab routing nyob rau hauv loj network. Ib me ntsis tom qab, lawv tau tsim lub rooj vag sab hauv routing raws tu qauv IGRP, uas zoo dua li RIP. Txawm li cas los xij, nws yog ntau dua ntawm qhov nrug vector raws tu qauv tshaj qhov txuas lub xeev raws tu qauv. Thaum xyoo 80s lig, tus qauv qhib tau tshwm sim, OSPFv2 txuas lub xeev raws tu qauv rau IPv4.
Nyob rau thaum ntxov 90s, Cisco txiav txim siab tias IGRP yuav tsum tau txhim kho thiab tso tawm Enhanced Internal Gateway Routing Protocol EIGRP. Nws tau ua haujlwm zoo dua li OSPF vim tias nws ua ke cov yam ntxwv ntawm RIP thiab OSPF. Thaum peb pib tshawb nrhiav nws, koj yuav pom tias EIGRP yooj yim dua rau kev teeb tsa dua li OSPF. Cisco sim tsim cov txheej txheem uas yuav ua kom muaj kev sib koom ua ke sai tshaj plaws.
Nyob rau hauv lub lig 90s, ib tug tshiab classless version ntawm lub RIPv2 raws tu qauv raug tso tawm. Hauv xyoo 2000s, qhov thib peb version ntawm OSPF, RIPng thiab EIGRPv6, uas txhawb nqa IPv6 raws tu qauv, tau tshwm sim. Lub ntiaj teb no maj mam nce mus rau tag nrho kev hloov pauv mus rau IPv6, thiab cov txheej txheem kev tsim tawm xav tau npaj rau qhov no.
Yog tias koj nco qab, peb tau kawm tias thaum xaiv txoj kev zoo tshaj plaws, RIP, raws li qhov kev ncua deb vector raws tu qauv, yog coj los ntawm tsuas yog ib qho kev ntsuas - qhov tsawg kawg nkaus ntawm hops, lossis qhov tsawg kawg nkaus nyob deb ntawm qhov chaw sib cuam tshuam. Yog li, router R1 yuav xaiv txoj kev ncaj qha mus rau router R3, txawm hais tias qhov ceev ntawm txoj kev no yog 64 kbit / s - ob peb zaug tsawg dua qhov ceev ntawm txoj kev R1-R2-R3, sib npaug rau 1544 kbit / s. RIP raws tu qauv yuav xav txog txoj kev qeeb ntawm ib lub hop ntev kom zoo dua li txoj kev ceev ntawm 2 hops.
OSPF yuav kawm tag nrho cov network topology thiab txiav txim siab siv txoj hauv kev los ntawm R3 raws li txoj kev nrawm dua rau kev sib txuas lus nrog router R2. RIP siv tus naj npawb ntawm hops raws li nws cov metric, thaum OSPF's metric yog tus nqi, uas feem ntau yog proportional rau bandwidth ntawm qhov txuas.
EIGRP tseem tsom mus rau cov nqi ntawm txoj kev, tab sis nws qhov kev ntsuas yog qhov nyuaj dua li OSPF thiab tso siab rau ntau yam, suav nrog Bandwidth, ncua sijhawm, kev ntseeg siab, Loading, thiab siab tshaj MTU. Piv txwv li, yog tias ib lub node loaded ntau dua li lwm tus, EIGRP yuav txheeb xyuas cov load ntawm tag nrho cov kev thiab xaiv lwm qhov nrog tsawg load.
Hauv chav kawm CCNA peb tsuas yog coj mus rau hauv tus account xws li metric tsim yam xws li Bandwidth thiab Delay; cov no yog cov qauv metric yuav siv.
Qhov nrug vector raws tu qauv RIP siv ob lub ntsiab lus: nrug thiab kev taw qhia. Yog tias peb muaj 3 routers, thiab ib qho ntawm lawv txuas nrog 20.0.0.0 network, ces qhov kev xaiv yuav raug ua los ntawm kev ncua deb - cov no yog hops, qhov no 1 hop, thiab los ntawm kev taw qhia, uas yog, raws li txoj kev - sab sauv. los yog qis dua - xa tsheb khiav.
Tsis tas li ntawd, RIP siv cov ntaub ntawv hloov tshiab raws sijhawm, faib cov lus ua tiav thoob plaws hauv lub network txhua 30 vib nas this. Qhov kev hloov tshiab no ua 2 yam. Qhov thib ib yog qhov hloov tshiab tiag tiag ntawm lub rooj sib tham, qhov thib ob yog tshuaj xyuas cov neeg nyob ze. Yog tias lub cuab yeej tsis tau txais cov lus teb hloov tshiab lossis cov ntaub ntawv qhia txog txoj kev tshiab los ntawm cov neeg nyob ze tsis pub dhau 30 vib nas this, nws nkag siab tias txoj kev mus rau cov neeg nyob ze yuav siv tsis tau lawm. Lub router xa qhov hloov tshiab txhua 30 vib nas this kom paub seb tus neeg nyob ze puas tseem muaj sia nyob thiab yog txoj hauv kev tseem siv tau.
Raws li kuv tau hais, Split Horizon thev naus laus zis yog siv los tiv thaiv txoj kev voj voog. Qhov no txhais tau hais tias qhov hloov tshiab tsis xa rov qab mus rau lub interface uas nws tuaj. Qhov thib ob thev naus laus zis los tiv thaiv lub voj voog yog Route Poison. Yog tias qhov kev sib txuas nrog 20.0.0.0 network qhia hauv daim duab cuam tshuam, lub router uas nws tau txuas nrog xa ib "txoj kev raug mob" rau nws cov neeg nyob ze, uas nws tshaj tawm tias lub network tam sim no nkag tau rau hauv 16 hops, uas yog, xyaum tsis ncav cuag. Qhov no yog li cas RIP raws tu qauv ua haujlwm.
EIGRP ua haujlwm li cas? Yog tias koj nco qab los ntawm cov lus qhia txog OSPF, cov txheej txheem no ua peb txoj haujlwm: nws tsim ib lub zej zog, siv LSA los hloov kho LSDB raws li kev hloov pauv hauv lub network topology, thiab tsim lub rooj sib tham. Tsim kom muaj ib lub zej zog yog ib txoj kev nyuaj uas siv ntau yam kev txwv. Piv txwv li, kuaj xyuas thiab hloov qhov kev sib txuas 2WAY - qee qhov kev sib txuas tseem nyob hauv ob txoj kev sib txuas lus, qee qhov mus rau FULL xeev. Tsis zoo li OSPF, qhov no tsis tshwm sim hauv EIGRP raws tu qauv - nws tsuas yog kuaj 4 qhov tsis muaj.
Zoo li OSPF, cov txheej txheem no xa cov lus nyob zoo uas muaj 10 qhov tsis raug txhua 4 vib nas this. Thawj yog qhov kev lees paub qhov tseeb, yog tias nws tau raug teeb tsa yav dhau los. Hauv qhov no, txhua yam khoom siv nrog qhov sib thooj tsim los yuav tsum muaj tib qhov kev lees paub tsis raug.
Qhov thib ob parameter yog siv los xyuas seb cov khoom siv puas yog tib yam kev tswj hwm tus kheej, uas yog, tsim kom muaj kev sib raug zoo siv EIGRP raws tu qauv, ob qho khoom siv yuav tsum muaj tib tus lej tswj hwm tus kheej. Qhov thib peb parameter yog siv los xyuas tias nyob zoo cov lus xa los ntawm tib qhov chaw IP chaw nyob.
Qhov thib plaub parameter yog siv los xyuas qhov sib xws ntawm qhov sib txawv ntawm K-Values ββcoefficients. EIRGP raws tu qauv siv 5 coefficients ntawm K1 txog K5. Yog tias koj nco ntsoov, yog tias K = 0 qhov tsis raug tsis quav ntsej, tab sis yog K = 1, ces cov kev txwv yog siv rau hauv cov qauv rau kev suav cov metric. Yog li, qhov tseem ceeb ntawm K1-5 rau cov khoom siv sib txawv yuav tsum yog tib yam. Nyob rau hauv chav kawm CCNA peb yuav coj qhov tseem ceeb ntawm cov coefficients no: K1 thiab K3 sib npaug rau 1, thiab K2, K4 thiab K5 sib npaug rau 0.
Yog li, yog tias 4 qhov tsis sib xws, EIGRP tsim kom muaj kev sib raug zoo ntawm cov neeg nyob ze thiab cov cuab yeej nkag mus rau ib leeg rau hauv lub rooj sib tham. Tom ntej no, kev hloov pauv tau ua rau lub rooj topology.
Tag nrho cov lus nyob zoo raug xa mus rau multicast IP chaw nyob 224.0.0.10, thiab cov kev hloov tshiab, nyob ntawm qhov kev teeb tsa, raug xa mus rau unicast chaw nyob ntawm cov neeg nyob ze lossis mus rau qhov chaw nyob multicast. Qhov kev hloov tshiab no tsis tuaj dhau UDP lossis TCP, tab sis siv cov txheej txheem sib txawv hu ua RTP, Txhim khu kev thauj mus los. Cov txheej txheem no xyuas seb tus neeg nyob ze puas tau txais qhov hloov tshiab, thiab raws li nws lub npe qhia, nws txoj haujlwm tseem ceeb yog los xyuas kom meej kev sib txuas lus. Yog tias qhov hloov tshiab tsis ncav cuag tus neeg nyob ze, qhov kev sib kis yuav rov qab mus txog thaum tus neeg nyob ze tau txais nws. OSPF tsis muaj lub tswv yim los xyuas cov khoom siv, yog li lub kaw lus tsis paub tias cov cuab yeej nyob sib ze tau txais qhov hloov tshiab lossis tsis tau.
Yog tias koj nco qab, RIP xa tawm qhov hloov tshiab ntawm qhov ua tiav network topology txhua 30 vib nas this. EIGRP tsuas yog ua qhov no yog tias lub cuab yeej tshiab tau tshwm sim hauv lub network lossis qee qhov kev hloov pauv tau tshwm sim. Yog tias lub subnet topology tau hloov pauv, cov txheej txheem yuav xa tawm qhov hloov tshiab, tab sis tsis yog tag nrho cov lus topology, tab sis tsuas yog cov ntaub ntawv nrog qhov kev hloov pauv no. Yog tias lub subnet hloov pauv, tsuas yog nws cov topology yuav hloov kho. Qhov no zoo li yog qhov hloov tshiab ib nrab uas tshwm sim thaum xav tau.
Raws li koj paub, OSPF xa tawm LSAs txhua 30 feeb, tsis hais seb puas muaj kev hloov pauv rau lub network. EIGRP yuav tsis xa tawm qhov hloov tshiab rau lub sijhawm txuas ntxiv mus txog thaum muaj qee qhov kev hloov pauv hauv lub network. Yog li, EIGRP muaj txiaj ntsig ntau dua li OSPF.
Tom qab cov routers tau pauv cov pob hloov tshiab, theem thib peb pib - tsim lub rooj sib tham raws li cov metric, uas yog suav nrog cov qauv qhia hauv daim duab. Nws suav cov nqi thiab txiav txim siab raws li tus nqi no.
Cia peb xav tias R1 xa nyob zoo rau router R2, thiab tus router xa nyob zoo rau router R1. Yog tias txhua qhov tsis sib xws, routers tsim ib lub rooj ntawm cov neeg nyob sib ze. Nyob rau hauv cov lus no, R2 sau ib qho nkag txog router R1, thiab R1 tsim ib qho kev nkag txog R2. Tom qab no, router R1 xa cov hloov tshiab rau lub network 10.1.1.0/24 txuas rau nws. Nyob rau hauv lub rooj sib tham, qhov no zoo li cov ntaub ntawv hais txog IP chaw nyob ntawm lub network, lub router interface uas muab kev sib txuas lus nrog nws, thiab tus nqi ntawm txoj kev los ntawm qhov interface no. Yog tias koj nco qab, tus nqi ntawm EIGRP yog 90, thiab tom qab ntawd tus nqi Distance yog qhia, uas peb yuav tham txog tom qab.
Cov qauv metric tiav zoo li qhov nyuaj dua, vim nws suav nrog cov txiaj ntsig ntawm K coefficients thiab ntau yam kev hloov pauv. Cisco lub vev xaib muab ib daim ntawv ua tiav ntawm cov qauv, tab sis yog tias koj hloov cov txiaj ntsig tsis zoo, nws yuav hloov mus rau hauv daim ntawv yooj yim - qhov ntsuas yuav sib npaug rau (bandwidth + Delay) * 256.
Peb yuav siv cov qauv yooj yim no los xam cov metric, qhov twg bandwidth nyob rau hauv kilobits yog sib npaug rau 107, muab faib los ntawm qhov tsawg tshaj plaws bandwidth ntawm tag nrho cov interfaces ua rau lub hom phiaj network tsawg-bandwidth, thiab cumulative-delay yog tag nrho. ncua nyob rau hauv kaum ntawm microseconds rau tag nrho cov interfaces coj mus rau lub hom phiaj network.
Thaum kawm EIGRP, peb yuav tsum nkag siab txog plaub lub ntsiab lus: Feasible Distance, Reported Distance, Successor (neighbor router with the lowest path cost to the destination network), thiab Feasible Successor (cov neeg zej zog thaub qab router). Txhawm rau nkag siab lawv txhais li cas, xav txog cov hauv qab no network topology.
Cia peb pib los ntawm kev tsim lub rooj routing R1 los xaiv txoj hauv kev zoo tshaj plaws rau network 10.1.1.0/24. Tom ntej no mus rau txhua lub cuab yeej qhov kev nkag mus hauv kbit / s thiab latency hauv ms tau qhia. Peb siv 100 Mbps lossis 1000000 kbps GigabitEthernet interfaces, 100000 kbps FastEthernet, 10000 kbps Ethernet, thiab 1544 kbps serial interfaces. Cov txiaj ntsig no tuaj yeem pom los ntawm kev saib cov yam ntxwv ntawm qhov sib thooj ntawm lub cev cuam tshuam hauv cov chaw router.
Lub neej dhau los ntawm Serial interfaces yog 1544 kbps, thiab txawm tias koj muaj 64 kbps kab, qhov kev nkag mus yuav tseem yog 1544 kbps. Yog li ntawd, ua tus thawj tswj hwm network, koj yuav tsum paub tseeb tias koj siv tus nqi bandwidth raug. Rau ib qho kev sib tham tshwj xeeb, nws tuaj yeem teeb tsa siv bandwidth hais kom ua, thiab siv cov lus txib ncua, koj tuaj yeem hloov pauv tus nqi ncua sijhawm. Koj tsis tas yuav txhawj xeeb txog lub neej ntawd bandwidth qhov tseem ceeb rau GigabitEthernet lossis Ethernet interfaces, tab sis ceev faj thaum xaiv kab ceev yog tias koj siv Serial interface.
Thov nco ntsoov tias hauv daim duab no qhov kev ncua yuav tsum tau qhia hauv milliseconds ms, tab sis qhov tseeb nws yog microseconds, Kuv tsuas yog tsis muaj tsab ntawv ΞΌ los ua kom raug microseconds ΞΌs.
Thov ua tib zoo mloog rau qhov tseeb hauv qab no. Yog tias koj muab qhov kev qhia interface g0/0 hais kom ua, lub kaw lus yuav tso saib qhov latency hauv kaum tawm microseconds es tsis yog microseconds xwb.
Peb yuav saib qhov teeb meem no kom meej nyob rau hauv cov yees duab tom ntej ntawm configuring EIGRP, rau tam sim no nco ntsoov tias thaum hloov latency qhov tseem ceeb rau hauv cov mis, 100 ΞΌs los ntawm daim duab hloov mus rau 10, vim cov mis siv kaum ntawm microseconds, tsis units.
Nyob rau hauv daim duab, kuv yuav qhia nrog liab dots lub interfaces uas qhia throughputs thiab qeeb cuam tshuam.
Ua ntej tshaj plaws, peb yuav tsum txiav txim siab txog qhov Ua Tau Li Cas. Qhov no yog FD metric uas suav nrog cov qauv. Rau ntu ntawm R5 mus rau sab nraud network, peb yuav tsum tau faib 107 los ntawm 106, vim li ntawd peb tau txais 10. Tom ntej no, rau tus nqi bandwidth no peb yuav tsum ntxiv qhov ncua sijhawm sib npaug rau 1, vim tias peb muaj 10 microseconds, uas yog, ib ten. Qhov txiaj ntsig ntawm 11 yuav tsum tau muab faib ua 256, uas yog, tus nqi metric yuav yog 2816. Qhov no yog FD tus nqi rau ntu ntawm lub network.
Router R5 yuav xa tus nqi no mus rau router R2, thiab rau R2 nws yuav dhau los ua qhov tshaj tawm Tshaj Tawm Tshaj Tawm, uas yog, tus nqi uas tus neeg nyob ze tau hais rau nws. Yog li, qhov kev tshaj tawm RD nrug rau tag nrho lwm yam khoom siv yuav sib npaug rau qhov ua tau FD qhov deb ntawm lub cuab yeej uas tau tshaj tawm rau koj.
Router R2 ua haujlwm FD xam raws li nws cov ntaub ntawv, uas yog, faib 107 los ntawm 105 thiab tau txais 100. Tom qab ntawd nws ntxiv rau qhov txiaj ntsig ntawm kev ncua ntawm txoj kev mus rau lwm lub network: R5 ncua sijhawm, sib npaug ntawm kaum microseconds, thiab nws tus kheej ncua, sib npaug rau kaum kaum. Tag nrho ncua sij hawm yuav yog 11 kaum microseconds. Peb ntxiv nws mus rau qhov tshwm sim puas thiab tau 111, muab tus nqi no los ntawm 256 thiab tau txais tus nqi FD = 28416. Router R3 ua tib yam, tau txais tom qab kev xam tus nqi FD = 281856. Router R4 xam tus nqi FD = 3072 thiab xa mus rau R1 li RD.
Thov nco ntsoov tias thaum xam FD, router R1 tsis hloov nws tus kheej bandwidth ntawm 1000000 kbit / s rau hauv cov qauv, tab sis qis bandwidth ntawm router R2, uas yog sib npaug rau 100000 kbit / s, vim tias cov qauv ib txwm siv qhov tsawg kawg nkaus bandwidth ntawm. lub interface ua rau lub hom phiaj network. Nyob rau hauv cov ntaub ntawv no, routers R10.1.1.0 thiab R24 nyob rau hauv txoj kev mus rau lub network 2/5, tab sis txij li thaum lub thib tsib router muaj ib tug loj bandwidth, qhov tsawg tshaj plaws bandwidth tus nqi ntawm router R2 yog hloov mus rau hauv lub mis. Tag nrho ncua sij hawm raws txoj kev R1-R2-R5 yog 1 + 10 + 1 (tens) = 12, qhov kev txo qis yog 100, thiab cov lej ntawm cov lej sib npaug los ntawm 256 muab tus nqi FD = 30976.
Yog li, txhua yam khoom siv tau suav FD ntawm lawv cov kev sib tshuam, thiab router R1 muaj 3 txoj hauv kev ua rau lub hom phiaj network. Cov no yog txoj kev R1-R2, R1-R3 thiab R1-R4. Lub router xaiv qhov tsawg kawg nkaus tus nqi ntawm qhov kev ncua deb FD, uas yog sib npaug rau 30976 - qhov no yog txoj hauv kev rau router R2. Lub router no dhau los ua tus Successor, lossis "successor". Cov lus routing kuj qhia txog Feasible Successor (backup successor) - nws txhais tau hais tias yog tias qhov kev sib txuas ntawm R1 thiab Successor puas lawm, txoj kev yuav raug xa mus los ntawm kev thaub qab Feasible Successor router.
Cov Neeg Ua Haujlwm Ua Tau Zoo tau raug xaiv raws li ib txoj cai: qhov kev tshaj tawm deb RD ntawm lub router no yuav tsum tsawg dua FD ntawm lub router nyob rau ntu mus rau Successor. Nyob rau hauv peb cov ntaub ntawv, R1-R2 muaj FD = 30976, RD nyob rau hauv seem R1-K3 yog sib npaug rau 281856, thiab RD nyob rau hauv seem R1-R4 yog sib npaug rau 3072. Txij li thaum 3072 <30976, router R4 yog xaiv raws li Feasible Successors.
Qhov no txhais tau hais tias yog kev sib txuas lus cuam tshuam rau ntawm R1-R2 network seem, kev khiav mus rau 10.1.1.0/24 network yuav raug xa mus raws txoj kev R1-R4-R5. Hloov txoj kev thaum siv RIP yuav siv sij hawm ntau kaum vib nas this, thaum siv OSPF nws yuav siv sij hawm ob peb feeb, thiab hauv EIGRP nws tshwm sim tam sim ntawd. Qhov no yog lwm qhov kom zoo dua ntawm EIGRP dua lwm cov kev cai routing.
Yuav ua li cas yog tias ob qho tib si Successor thiab Feasible Successor raug txiav tawm tib lub sijhawm? Hauv qhov no, EIGRP siv DUAL algorithm, uas tuaj yeem suav cov kev thaub qab los ntawm qhov yuav ua tiav. Qhov no yuav siv sijhawm li ob peb feeb, thaum lub sijhawm EIGRP yuav pom lwm tus neeg nyob ze uas tuaj yeem siv los xa cov tsheb thauj mus los thiab tso nws cov ntaub ntawv hauv lub rooj sib tham. Tom qab no, cov txheej txheem yuav txuas ntxiv nws txoj haujlwm ib txwm ua.
Ua tsaug uas koj nyob nrog peb. Koj puas nyiam peb cov ntawv? Xav pom cov ntsiab lus nthuav ntxiv? Txhawb nqa peb los ntawm kev tso ib qho kev txiav txim lossis qhia rau cov phooj ywg, 30% luv nqi rau cov neeg siv Habr ntawm qhov tshwj xeeb analogue ntawm nkag-theem servers, uas tau tsim los ntawm peb rau koj: (muaj nrog RAID1 thiab RAID10, mus txog 24 cores thiab mus txog 40GB DDR4).
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Tau qhov twg los: www.hab.com