Vim tias LAN switches siv virtual circuit switching, lawv tuaj yeem ua kom ntseeg tau tias qhov bandwidth ntawm txhua qhov chaw nres nkoj nkag thiab tawm tsis muaj kev sib cav, ua rau muaj kev sib kis cov ntaub ntawv ceev ceev ntawm cov chaw nres nkoj yam tsis tsim kev sib kis bottlenecks. Qhov no ua rau cov ntaub ntawv ntau ntxiv ntawm cov ntsiab lus hauv network thiab ua kom zoo dua tag nrho lub network system. Tsab xov xwm no piav qhia txog tsib lub thev naus laus zis tseem ceeb uas koom nrog.
1. Programmable ASIC (Daim Ntawv Thov Tshwj Xeeb Integrated Circuit)
Qhov no yog ib lub chip integrated circuit tshwj xeeb uas tsim los kom zoo dua Layer-2 switching. Nws yog lub hauv paus tseem ceeb ntawm kev sib koom ua ke siv rau hauv cov kev daws teeb meem network niaj hnub no. Ntau lub luag haujlwm tuaj yeem koom ua ke rau hauv ib lub chip, muab cov txiaj ntsig xws li kev tsim qauv yooj yim, kev ntseeg siab siab, kev siv hluav taws xob tsawg, kev ua haujlwm siab dua, thiab tus nqi qis dua. Cov chips ASIC programmable uas tau txais kev pom zoo dav dav hauv LAN switches tuaj yeem hloov kho los ntawm cov chaw tsim khoom - lossis txawm tias los ntawm cov neeg siv - kom ua tau raws li cov kev xav tau ntawm daim ntawv thov. Lawv tau dhau los ua ib qho ntawm cov thev naus laus zis tseem ceeb hauv LAN switch daim ntawv thov.
2. Cov Kav Dej Faib Tawm
Nrog rau kev faib cov kav dej, ntau lub cav xa mus rau lwm qhov tuaj yeem xa lawv cov pob ntawv sai thiab ywj pheej. Hauv ib qho kav dej, ntau lub ASIC chips tuaj yeem ua tiav ntau lub thav duab tib lub sijhawm. Qhov kev sib koom ua ke thiab kev xa mus rau lwm qhov no ua rau kev ua haujlwm xa mus rau qib tshiab, ua tiav kev ua tau zoo ntawm kab-tus nqi rau unicast, tshaj tawm, thiab ntau lub tsheb khiav ntawm txhua qhov chaw nres nkoj. Yog li ntawd, kev faib cov kav dej yog ib qho tseem ceeb hauv kev txhim kho LAN switching speeds.
3. Kev Nco Ntsoov Dynamically Scalable
Rau cov khoom siv hloov LAN siab heev, kev ua haujlwm siab thiab kev ua haujlwm zoo feem ntau vam khom lub cim xeeb ntse. Cov thev naus laus zis nco dynamically scalable tso cai rau lub hloov kom nthuav dav lub peev xwm nco ntawm qhov ya raws li qhov xav tau ntawm tsheb khiav. Hauv Layer-3 switches, ib feem ntawm lub cim xeeb yog txuas ncaj qha nrog lub cav xa mus, ua kom muaj kev ntxiv ntawm ntau lub interface modules. Raws li tus lej ntawm cov cav xa mus nce ntxiv, lub cim xeeb txuas ntxiv nthuav dav raws li. Los ntawm kev ua tiav ASIC raws li pipeline, buffers tuaj yeem tsim dynamically kom nce kev siv cim xeeb thiab tiv thaiv kev poob pob ntawv thaum lub sijhawm loj ntawm cov ntaub ntawv.
4. Cov Txheej Txheem Kab Siab Tshaj Plaws
Txawm hais tias lub cuab yeej network muaj zog npaum li cas los xij, nws tseem yuav raug kev txom nyem los ntawm kev sib tsoo hauv cov ntu network txuas nrog. Ib txwm muaj, tsheb khiav ntawm qhov chaw nres nkoj raug khaws cia rau hauv ib kab tso zis, ua tiav raws li FIFO kev txiav txim tsis hais qhov tseem ceeb. Thaum kab puv, cov pob khoom ntau dhau raug tso tseg; thaum kab ntev dua, kev ncua sijhawm nce ntxiv. Lub tshuab kab ke ib txwm no tsim teeb meem rau lub sijhawm tiag tiag thiab cov ntawv thov multimedia.
Yog li ntawd, ntau tus neeg muag khoom tau tsim cov thev naus laus zis siab heev los txhawb cov kev pabcuam sib txawv ntawm Ethernet ntu, thaum tswj kev ncua thiab jitter. Cov no tuaj yeem suav nrog ntau theem ntawm cov kab ib qho chaw nres nkoj, ua kom muaj kev sib txawv zoo dua ntawm cov theem tsheb khiav. Multimedia thiab cov ntaub ntawv tiag tiag-lub sijhawm tau muab tso rau hauv cov kab tseem ceeb, thiab nrog rau qhov hnyav ncaj ncees queuing, cov kab no tau ua tiav ntau zaus - yam tsis quav ntsej txog cov tsheb khiav qis dua. Cov neeg siv daim ntawv thov ib txwm tsis pom kev hloov pauv hauv lub sijhawm teb lossis throughput, thaum cov neeg siv khiav cov ntawv thov lub sijhawm tseem ceeb tau txais cov lus teb raws sijhawm.
5. Kev faib tawm tsheb khiav tsis siv neeg
Hauv kev xa xov hauv network, qee cov ntaub ntawv ntws tseem ceeb dua lwm tus. Cov hloov pauv LAN txheej-3 tau pib siv cov thev naus laus zis faib tsheb khiav tsis siv neeg los sib txawv ntawm ntau hom thiab qhov tseem ceeb ntawm tsheb khiav. Kev xyaum qhia tau hais tias nrog kev faib tsheb khiav tsis siv neeg, cov hloov pauv tuaj yeem qhia cov kav dej ua tiav pob ntawv kom sib txawv cov dej ntws uas tus neeg siv xaiv, ua tiav qis latency thiab kev xa mus rau qhov tseem ceeb. Qhov no tsis tsuas yog muab kev tswj hwm zoo thiab kev tswj hwm rau cov kwj deg tsheb khiav tshwj xeeb, tab sis kuj pab tiv thaiv kev sib tsoo hauv network.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-20-2025