Txheej 3 hloov tshuab=Txheej 2 hloov ntxiv rau txheej 3 kev ua haujlwm txoj cai
Thaum cov ntaub ntawv tau txais los ntawm qhov chaw nres nkoj nti, qhov chaw sib txuas MAC chaw nyob yog thawj zaug tshawb hauv Txheej 2 hloov nti. Yog tias pom, Layer 2 forwarding yog ua, txwv tsis pub cov ntaub ntawv raug xa mus rau Tier 3 engine.
Hauv peb txheej cav, ASIC nti tshawb nrhiav cov ntaub ntawv sib txuas lus sib tham, sib piv nrog qhov chaw nyob IP ntawm cov ntaub ntawv, thiab tom qab ntawd xa cov ntaub ntawv ARP mus rau tus tswv tsev kom tau txais MAC chaw nyob ntawm tus tswv tsev, thiab xa MAC chaw nyob rau txheej thib ob nti. Cov txheej nti xa mus rau pob ntawv.
(1) Kev cai MLS
tseem hu ua network flow-based switching. Lub cav peb txheej ntawm qhov hloov pauv tsuas yog yuav tsum tau ua cov ntaub ntawv thawj zaug hauv cov ntaub ntawv ntws, thiab tag nrho cov ntaub ntawv txuas ntxiv raug xa mus los ntawm kev kho vajtse (txoj kev no yog hu ua "ib zaug routing, ntau yam hloov"), yog li ua tiav peb- txheej switching hlau-speed forwarding.
(2) Raws li topology-based forwarding qauv ntawm MLS raws li CEF
, tag nrho cov ntaub ntawv routing yog ntxiv rau cov ntaub ntawv xa mus hauv FIB ua ntej, thiab qhov hloov pauv tuaj yeem tshawb nrhiav IP chaw nyob, chaw nyob tom ntej thiab MAC chaw nyob.
