Centralized Routing vs Distributed Routing | Centralized Routing vs Distributed Routing
Routing yog tus txheej txheem ntawm kev xaiv txoj hauv kev uas yuav siv los xa cov tsheb khiav hauv lub network, thiab xa cov pob ntawv raws li cov kev xaiv sub-network. Centralized routing qauv yog ib tug qauv routing nyob rau hauv uas routing yog centrally nqa tawm siv ib tug centralized database. Ntawm qhov tsis sib xws, cov qauv kev faib tawm yog tus qauv routing, uas cuam tshuam nrog kev ua haujlwm routing siv cov ntaub ntawv faib tawm.
Dab tsi yog Centralized Routing?
Centralized routing qauv yog tus qauv routing nyob rau hauv uas routing yog centrally nqa tawm siv ib tug centralized database. Hauv lwm lo lus, lub rooj sib tham tau khaws cia ntawm ib qho "central" node, uas yuav tsum tau sab laj thaum lwm cov nodes yuav tsum tau txiav txim siab routing. Qhov no centralized database muaj lub ntiaj teb no network saib. Centralized routing yog qhov tsim nyog tshaj plaws hauv cov npe tshwj xeeb nrog cov tshuab muab DWDM (Dense Wavelength Division Multiplexing) kis. Yog vim li cas rau qhov no yog tias cov tshuab DWDM no muaj OADM (Optical Add-Drop Multiplexer) uas tuaj yeem kho dua tshiab, nyob rau hauv qhov chaw pib thiab qhov kawg ntawm kev sib txuas lus nruab nrab. Cov neeg tawm tswv yim ntawm kev sib tham hauv nruab nrab qhia tias vim hais tias feem ntau cov ntaub ntawv xws li cov ntsiab lus ntawm SRLG (Shared Risk Link Group) thiab cov kev ua tau zoo tsis hloov ntau zaus (thiab cov ntaub ntawv no yuav tsis pom tus kheej lossis tshaj tawm), lawv yog qhov zoo tshaj plaws nyob hauv central database. Hauv cov qauv hauv nruab nrab, cov ntaub ntawv ntawm lub xeev tuaj yeem nkag tau yooj yim. Yog li, cov ntaub ntawv ntawm kev vam khom (nrog rau kev sib txuas lus) ntawm circuits (kom paub tseeb tias muaj ntau haiv neeg) tuaj yeem ua haujlwm tau yooj yim thaum cov terminals tsis sib koom ntawm circuits, thiab qhov no yog qhov zoo tagnrho rau cov qauv kev coj ua hauv nruab nrab. Cov qauv hauv nruab nrab siv cov ntaub ntawv hauv lub xeev thoob ntiaj teb. Cov kev suav uas tau ua tiav (xws li kev suav ua ntej txoj hauv kev rau kev kho dua tshiab) tuaj yeem tau txais txiaj ntsig zoo los ntawm cov ntaub ntawv thoob ntiaj teb no thiab yog li qhov no tsim nyog rau tus qauv hauv nruab nrab.
Dab tsi yog kev xa khoom?
Nyob rau hauv cov qauv routing, txhua tus ntawm khaws cov lus sib txawv. Distributed routing qauv yog tus qauv routing, uas yog qhov zoo tshaj plaws rau cov npe uas tuaj yeem txheeb xyuas tau tag nrho opaque. Qhov laj thawj tseem ceeb ntawm qhov no yog qhov kev txwv ntawm kev puas tsuaj tsis ua lub luag haujlwm hauv kev coj mus rau hauv cov lus hais saum toj no. Nyob rau hauv cov ntaub ntawv ntawm ib tug tsis ua hauj lwm (thaum muaj ib tug yuav tsum tau rov qab sai sai), kev faib routing system muaj peev xwm tso siab rau los ris lub luag hauj lwm ntawm kev xav tau kev suav ntawm ib txoj kev ntawm kev rov qab los rau txhua lub teeb-paths uas ua tsis tau tejyam (txawm ntawm qhov taw tes ntawm kev kuaj pom qhov tsis ua tiav). Thaum kawg, cov qauv kev faib tawm tau zoo sib xws nrog cov Internet uas twb muaj lawm tus kheej txoj kev faib tawm txoj kev xav.
Qhov txawv ntawm Centralized Routing thiab Distributed Routing yog dab tsi?
Centralized routing qauv nqa tawm routing siv ib tug centralized database, thaum faib routing qauv deals nrog nqa tawm routing siv ib tug faib database. Hauv cov ntsiab lus yooj yim, ib lub hauv paus ntawm lub hauv paus tuav lub rooj sib tham hauv cov qauv hauv nruab nrab, thaum txhua tus ntawm khaws lub rooj sib tham hauv cov qauv faib. Vim tias ntau cov ntaub ntawv tsis hloov ntau zaus, ntau tus ntseeg tias cov ntaub ntawv no yog qhov tsim nyog yuav tsum tau nyob hauv lub hauv paus database. Cov kev suav ua ntej uas xav tau rau kev kho dua tshiab tuaj yeem ua kom zoo dua ntawm cov ntaub ntawv thoob ntiaj teb muaj nyob rau hauv cov ntaub ntawv hauv nruab nrab. Tab sis, tsis zoo li cov txheej txheem kev xa tawm, lub hauv paus system tsis tuaj yeem tso siab rau lub luag haujlwm ntawm kev xav tau kev suav ntawm txoj hauv kev ntawm kev rov qab los rau txhua txoj kev teeb pom kev zoo uas ua tsis tau tiav (thaum lub sijhawm kuaj pom qhov tsis ua tiav). Tsis zoo li cov hauv paus ntsiab lus, cov qauv kev faib tawm tau zoo sib xws nrog cov Internet uas twb muaj lawm tus kheej txoj kev faib tawm txoj kev xav.
