Hauv kev tsim network niaj hnub no, Layer 2 redundancy tsis yog qhov sib tham tau rau kev ua kom muaj kev lag luam txuas ntxiv mus, txo qhov downtime, thiab zam kev tshaj tawm cua daj cua dub los ntawm network loops. Thaum nws los txog rau kev siv Layer 2 redundancy, peb lub thev naus laus zis tswj hwm thaj av: Spanning Tree Protocol (STP), Multi-Chassis Link Aggregation Group (MLAG), thiab Switch Stacking. Tab sis koj xaiv qhov yog rau koj lub network li cas? Phau ntawv qhia no rhuav tshem txhua lub thev naus laus zis, piv lawv cov txiaj ntsig thiab qhov tsis zoo, thiab muab cov kev nkag siab ua tau los pab koj txiav txim siab zoo - tsim rau cov kws ua haujlwm network, cov thawj coj IT, thiab txhua tus neeg uas muaj lub luag haujlwm tsim kom muaj kev txhim khu kev qha, scalable Layer 2 infrastructure.
Nkag Siab Txog Cov Ntsiab Lus Tseem Ceeb: Txheej 2 Redundancy Yog Dab Tsi?
Txheej 2 redundancy yog hais txog kev xyaum tsim cov network topology nrog cov txuas sib txuas, cov hloov pauv, lossis txoj kev kom ntseeg tau tias yog tias ib qho khoom tsis ua haujlwm, cov tsheb khiav yuav rov qab mus rau qhov thaub qab. Qhov no tshem tawm cov ntsiab lus tsis ua haujlwm ib zaug xwb (SPOFs) thiab ua kom cov ntawv thov tseem ceeb khiav - txawm tias koj tswj hwm lub network chaw ua haujlwm me me, lub tsev kawm ntawv loj, lossis lub chaw khaws ntaub ntawv ua haujlwm siab. Peb qhov kev daws teeb meem tseem ceeb - STP, MLAG, thiab Stacking - txhua txoj hauv kev redundancy sib txawv, nrog rau kev sib pauv tshwj xeeb hauv kev ntseeg tau, kev siv bandwidth, kev tswj hwm nyuaj, thiab tus nqi.
1. Spanning Tree Protocol (STP): Tus Txheej Txheem Redundancy Ib Txwm Muaj
STP ua haujlwm li cas?
Tsim los ntawm Radia Perlman xyoo 1985, STP (IEEE 802.1D) yog cov thev naus laus zis qub tshaj plaws thiab txhawb nqa dav tshaj plaws ntawm Layer 2 redundancy. Nws lub hom phiaj tseem ceeb yog los tiv thaiv kev sib txuas ntawm network los ntawm kev txheeb xyuas thiab thaiv cov kev sib txuas uas tsis tseem ceeb, tsim ib qho logical "ntoo" topology. STP siv Bridge Protocol Data Units (BPDUs) los xaiv lub hauv paus choj (lub qhov hloov nrog Bridge ID qis tshaj plaws), xam txoj kev luv tshaj plaws mus rau hauv paus, thiab thaiv cov kev sib txuas tsis tseem ceeb kom tshem tawm cov loops.
Raws li lub sijhawm dhau los, STP tau hloov zuj zus los daws nws cov kev txwv thawj zaug: RSTP (STP ceev, IEEE 802.1w) txo lub sijhawm sib sau ua ke los ntawm 30-50 vib nas this mus rau 1-6 vib nas this los ntawm kev ua kom yooj yim rau cov xwm txheej chaw nres nkoj thiab qhia txog Kev Sib Tham / Kev Pom Zoo (P / A) kev sib koom tes. MSTP (Ntau Txoj Kev Sib Tham Tsob Ntoo Protocol, IEEE 802.1s) ntxiv kev txhawb nqa rau ntau VLANs, tso cai rau ntau pawg VLAN siv cov kev xa mus sib txawv thiab ua kom VLAN-level load balancing - daws qhov "txhua VLANs sib koom ib txoj kev" qhov tsis zoo ntawm classic STP.
Qhov zoo ntawm STP
- Sib xws dav dav: Txhawb nqa los ntawm txhua lub TAP keyboards niaj hnub no, tsis hais tus muag khoom (Mylinking).
- Tus nqi qis: Tsis tas yuav muaj khoom siv kho vajtse lossis daim ntawv tso cai ntxiv—ua haujlwm los ntawm lub neej ntawd ntawm feem ntau cov keyboards.
- Yooj yim rau kev siv: Kev teeb tsa yooj yim yog qhov tsawg heev, ua rau nws zoo tagnrho rau cov tes hauj lwm me me mus rau nruab nrab (SMBs) nrog cov peev txheej IT tsawg.
- Kev ntseeg tau zoo: Ib qho thev naus laus zis laus nrog ntau xyoo ntawm kev siv hauv ntiaj teb tiag tiag, ua haujlwm ua "kev nyab xeeb" rau kev tiv thaiv kev voj voog.
Qhov tsis zoo ntawm STP
- Kev pov tseg Bandwidth: Cov kev sib txuas redundant raug thaiv (tsawg kawg 50% hauv cov xwm txheej dual-uplink), yog li koj tsis siv tag nrho cov bandwidth muaj.
- Kev sib txuas qeeb qeeb (STP qub): STP ib txwm siv sijhawm 30-50 vib nas this los rov zoo los ntawm qhov tsis ua haujlwm ntawm qhov txuas—qhov no tseem ceeb rau cov ntawv thov xws li kev lag luam nyiaj txiag lossis kev sib tham video.
- Kev sib npaug ntawm qhov hnyav tsawg: Classic STP tsuas yog txhawb nqa ib txoj kev ua haujlwm xwb; MSTP txhim kho qhov no tab sis ntxiv qhov nyuaj rau kev teeb tsa.
- Txoj kab uas hla ntawm lub network: STP tsuas yog txwv rau 7 hops, uas tuaj yeem txwv cov qauv tsim network loj.
Cov Qauv Siv Zoo Tshaj Plaws rau STP
STP (los yog RSTP/MSTP) yog qhov zoo tagnrho rau:
- Cov lag luam me thiab nruab nrab (SMBs) uas muaj cov kev xav tau yooj yim thiab cov peev nyiaj IT tsawg.
- Cov tes hauj lwm qub uas tsis tuaj yeem hloov kho mus rau MLAG lossis Stacking.
- Ua ib txoj kab tiv thaiv kawg los tiv thaiv cov voj voog hauv cov tes hauj lwm uas twb siv MLAG lossis Stacking lawm.
- Cov tes hauj lwm nrog cov khoom siv sib xyaw ua ke, qhov twg kev sib raug zoo yog qhov tseem ceeb tshaj plaws.
2. Kev Hloov Chaw Sib Sau Ua Ke: Kev Tswj Xyuas Yooj Yim nrog Kev Ua Haujlwm Virtualization
Kev Hloov Stacking Ua Haujlwm Li Cas?
Kev Sib Tshuam Hloov (piv txwv li, Mylinking TAP Switch) txuas 2-8 (lossis ntau dua) cov hloov pauv zoo sib xws siv cov chaw nres nkoj thiab cov xov hlau tshwj xeeb, tsim ib qho kev hloov pauv logical. Lub hloov pauv virtualized no sib koom ib qho IP tswj hwm, cov ntaub ntawv teeb tsa, lub dav hlau tswj, lub rooj chaw nyob MAC, thiab STP piv txwv. Ib qho kev hloov pauv master raug xaiv (raws li qhov tseem ceeb thiab chaw nyob MAC) los tswj hwm lub stack, nrog rau cov hloov pauv thaub qab npaj txhij los siv yog tias tus tswv tsis ua haujlwm. Tsheb khiav raug xa mus hla lub stack ntawm lub backplane ceev ceev, thiab cov pab pawg sib koom ua ke ntawm cov tswv cuab (LAGs) ua haujlwm hauv hom nquag-active yam tsis muaj STP thaiv.
Qhov Zoo ntawm Switch Stacking
- Kev tswj hwm yooj yim: Tswj ntau lub cev hloov pauv ua ib lub cuab yeej siv logical—ib qho IP, ib qho kev teeb tsa, thiab ib qho chaw saib xyuas.
- Kev siv bandwidth siab: Cov kev sib txuas redundant yog nquag (tsis muaj kev thaiv), thiab stack backplanes muab cov bandwidth sib sau ua ke.
- Kev ua haujlwm sai: Qhov hloov pauv Master-backup failover siv sijhawm 1-3 milliseconds, ua kom lub sijhawm tsis ua haujlwm yuav luag xoom.
- Kev nthuav dav: Ntxiv cov switches rau hauv pawg "them-raws li-koj-loj hlob" yam tsis tau rov teeb tsa tag nrho lub network - zoo tagnrho rau kev nthuav dav cov txheej txheem nkag mus.
- Kev sib koom ua ke ntawm LACP: Cov servers uas muaj ob lub NICs tuaj yeem txuas rau lub stack ntawm LACP, tshem tawm qhov xav tau STP.
Qhov tsis zoo ntawm Switch Stacking
- Kev pheej hmoo ntawm ib lub dav hlau tswj: Yog tias lub qhov hloov pauv tseem ceeb ua tsis tau (lossis tag nrho cov xov hlau sib dhos tawg), tag nrho cov xov hlau sib dhos yuav rov pib dua lossis faib ua ob ntu—ua rau lub network tsis ua haujlwm tag nrho.
- Kev txwv ntawm qhov deb: Feem ntau cov xov hlau sib dhos yog 1-3 meters (txog li 10 meters siab tshaj plaws), ua rau nws tsis yooj yim sua kom sib dhos cov qhov hloov pauv hla cov txee lossis hauv pem teb.
- Kev xauv kho vajtse: Cov hloov pauv yuav tsum yog tib tus qauv, tus muag khoom, thiab firmware version - kev sib xyaw ua ke muaj kev pheej hmoo lossis tsis muaj kev txhawb nqa.
- Kev hloov kho tshiab mob heev: Feem ntau cov stacks xav tau kev pib dua tag nrho rau kev hloov kho firmware (txawm tias nrog ISSU, qhov kev pheej hmoo ntawm downtime yog siab dua).
- Kev nthuav dav tsawg: Qhov loj ntawm pawg tau txwv (feem ntau yog 8-10 lub pob hloov), thiab kev ua tau zoo poob qis dua qhov txwv ntawd.
Cov Qauv Siv Zoo Tshaj Plaws rau Kev Hloov Chaw Sib Sau Ua Ke
Kev Hloov Stacking yog qhov zoo meej rau:
- Nkag mus rau cov txheej txheem hauv cov tsev kawm ntawv lossis cov chaw khaws ntaub ntawv, qhov twg qhov chaw nres nkoj ceev thiab kev tswj hwm yooj yim yog qhov tseem ceeb.
- Cov tes hauj lwm nrog cov keyboards hauv tib lub khib lossis txee dai khaub ncaws (tsis muaj kev txwv qhov deb).
- Cov lag luam me thiab nruab nrab (SMEs) lossis cov lag luam me uas xav tau kev ua haujlwm ntau yam tsis muaj kev nyuaj ntawm MLAG.
- Cov chaw uas cov pab pawg IT me me thiab xav tau txo cov nqi tswj hwm.
3. MLAG (Multi-Chassis Link Aggregation Group): Kev Ntseeg Siab Rau Cov Network Tseem Ceeb
MLAG ua haujlwm li cas?
MLAG (tseem hu ua vPC rau Cisco Nexus, MC-LAG rau Juniper) tso cai rau ob lub switches ywj pheej ua haujlwm ua ib qho logical switch rau cov khoom siv downstream (servers, access switches). Cov khoom siv downstream txuas ntawm ib qho LACP Port-Channel, uas siv ob qho uplinks hauv hom active-active - tshem tawm STP blocking. Cov khoom tseem ceeb ntawm MLAG suav nrog:
- Peer-Link: Ib qho kev sib txuas ceev ceev (40/100G) ntawm ob lub MLAG switches los sib txuas MAC cov rooj, ARP entries, STP states, thiab configuration.
- Keepalive Link: Ib qho txuas sib cais los saib xyuas kev noj qab haus huv ntawm cov phooj ywg thiab tiv thaiv cov xwm txheej sib cais ntawm lub hlwb.
- Kev Sib Txuas Lus ID System: Ob lub switches sib koom tib lub LACP System ID thiab virtual MAC address, yog li cov khoom siv downstream pom lawv ua ib lub switch.
Tsis zoo li stacking, MLAG siv ob lub dav hlau tswj—txhua lub switch muaj nws tus kheej CPU, nco, thiab OS—yog li ntawd, qhov ua tsis tiav hauv ib lub switch tsis rhuav tshem tag nrho lub system.
Cov txiaj ntsig ntawm MLAG
- Kev ntseeg tau zoo tshaj plaws: Ob lub dav hlau tswj txhais tau tias ib lub qhov hloov pauv tuaj yeem ua tsis tiav yam tsis cuam tshuam rau tag nrho lub network - kev ua tsis tiav yog milliseconds.
- Kev hloov kho ywj pheej: Hloov kho ib qho hloov pauv ib zaug (nrog ISSU/Graceful Restart) thaum lwm qhov tswj hwm kev thauj mus los—tsis muaj sijhawm poob.
- Kev ywj pheej ntawm qhov deb: Peer-Link siv cov fiber txheem, tso cai rau MLAG switches kom muab tso rau ntawm cov txee, pem teb, lossis txawm tias cov chaw khaws ntaub ntawv (txog li kaum tawm kilometers).
- Tsim nyog tus nqi: Tsis muaj cov khoom siv stacking tshwj xeeb - siv cov chaw nres nkoj hloov uas twb muaj lawm rau Peer-Link thiab Keepalive.
- Zoo tagnrho rau cov qauv ntoo-nplooj ntoo: Zoo meej rau cov chaw khaws ntaub ntawv siv cov qauv ntoo-nplooj ntoo, qhov twg cov hloov nplooj ntoo txuas ob qho tib si rau MLAG-enabled spine switches.
Qhov tsis zoo ntawm MLAG
- Kev teeb tsa nyuaj dua: Yuav tsum muaj kev teeb tsa nruj ntawm ob lub switches - txhua qhov tsis sib xws tuaj yeem ua rau cov chaw nres nkoj kaw.
- Kev tswj hwm ob qho tib si: Txawm hais tias virtual IP tuaj yeem ua rau kev nkag mus yooj yim dua, koj tseem yuav tsum tau saib xyuas thiab tswj hwm ob lub switches sib cais.
- Qhov yuav tsum tau ua ntawm Peer-Link bandwidth: Peer-Link yuav tsum tau loj kom tswj tau tag nrho cov bandwidth downstream (pom zoo kom sib npaug lossis ntau dua) kom tsis txhob muaj teeb meem.
- Kev siv tshwj xeeb rau tus muag khoom: MLAG ua haujlwm zoo tshaj plaws nrog tib tus neeg muag khoom hloov pauv (piv txwv li, Cisco vPC, Huawei M-LAG) - kev txhawb nqa hla tus muag khoom yog txwv.
Cov Qauv Siv Zoo Tshaj Plaws rau MLAG
MLAG yog qhov kev xaiv zoo tshaj plaws rau:
- Cov chaw khaws ntaub ntawv (lub lag luam lossis huab) qhov twg tsis muaj sijhawm tsis ua haujlwm thiab kev ntseeg siab siab yog qhov tseem ceeb.
- Cov tes hauj lwm nrog cov hloov pauv hla ntau lub racks, pem teb, lossis qhov chaw (kev ywj pheej ntawm qhov deb).
- Cov qauv tsim ntawm cov nplooj txha nraub qaum thiab cov tes hauj lwm loj hauv tuam txhab.
- Cov koom haum uas khiav cov ntawv thov tseem ceeb (piv txwv li, kev pabcuam nyiaj txiag, kev kho mob) uas tsis tuaj yeem zam kev tsis ua haujlwm.
STP vs MLAG vs Stacking: Kev Sib Piv ntawm Head-to-Head
| Cov Qauv | STP (RSTP/MSTP) | Hloov Chaw Sib Sau Ua Ke | MLAG |
|---|---|---|---|
| Dav Hlau Tswj | Faib tawm (ib qho hloov) | Ib leeg (sib koom thoob plaws pawg) | Ob leeg (ywj siab rau ib qho kev hloov) |
| Kev Siv Bandwidth | Qis (cov kev sib txuas uas tsis siv lawm raug thaiv) | Siab (cov kev sib txuas nquag-nquag) | Siab (cov kev sib txuas nquag-nquag) |
| Lub Sijhawm Sib Koom Ua Ke | 1-6s (RSTP); 30-50s (STP qub) | 1-3ms (master failover) | Milliseconds (peer failover) |
| Kev Tswj Xyuas Nyuaj | Qis | Qis (ib lub cuab yeej siv logical) | Siab (kev sib txuas lus nruj) |
| Kev Txwv Qhov Nrug Deb | Tsis muaj (cov kev sib txuas txheem) | Tsawg heev (1-10m) | Yooj yim (kaum tawm kilometers) |
| Cov Kev Xav Tau Kho Vaj Tse | Tsis muaj (built-in) | Tib tus qauv/tus muag khoom + cov xov hlau sib dhos | Tib tus qauv/tus muag khoom (pom zoo) |
| Zoo Tshaj Plaws Rau | SMBs, cov tes hauj lwm qub, kev tiv thaiv kev voj voog | Cov txheej txheem nkag mus, cov hloov pauv tib lub khib, kev tswj hwm yooj yim | Cov chaw khaws ntaub ntawv, cov tes hauj lwm tseem ceeb, cov qauv tsim ntawm cov nplooj ntoo |
Yuav Xaiv Li Cas: Cov Kauj Ruam Ib Kauj Ruam Los Ntawm Cov Kauj Ruam Qhia Txog Kev Txiav Txim Siab?
Yuav xaiv qhov kev daws teeb meem Layer 2 redundancy zoo, ua raws li cov kauj ruam no:
1. Soj ntsuam koj cov kev xav tau kev ntseeg siab: Yog tias xoom lub sijhawm tsis ua haujlwm yog qhov tseem ceeb (piv txwv li, cov chaw khaws ntaub ntawv), MLAG yog qhov kev xaiv zoo tshaj plaws. Rau cov kev rov ua dua yooj yim (piv txwv li, SMBs), STP lossis Stacking ua haujlwm.
2. Xav txog qhov chaw tso cov hloov pauv: Yog tias cov hloov pauv nyob hauv tib lub txee/chav khaws khoom, Kev teeb tsa zoo. Yog tias lawv nyob thoob plaws qhov chaw, MLAG lossis STP zoo dua.
3. Soj ntsuam cov peev txheej kev tswj hwm: Cov pab pawg IT me me yuav tsum muab qhov tseem ceeb rau Stacking (kev tswj hwm yooj yim) lossis STP (kev saib xyuas tsawg). Cov pab pawg loj dua tuaj yeem tswj tau MLAG qhov nyuaj.
4. Tshawb xyuas cov kev txwv ntawm cov peev nyiaj: STP yog pub dawb (ua-hauv). Kev teeb tsa xav tau cov cables tshwj xeeb. MLAG siv cov chaw nres nkoj uas twb muaj lawm tab sis tej zaum yuav xav tau cov kev sib txuas ceev dua (40/100G) rau Peer-Link.
5. Npaj rau kev nthuav dav: Rau cov tes hauj lwm loj (10+ lub switches), MLAG muaj peev xwm nthuav dav dua li Stacking. STP ua haujlwm rau cov nplai me mus rau nruab nrab tab sis pov tseg bandwidth.
Cov Lus Qhia Kawg
- Xaiv STP (RSTP/MSTP) yog tias koj muaj nyiaj tsawg, muaj cov khoom siv sib xyaw, lossis muaj lub network qub - siv nws ua lub vas tiv thaiv kev voj voog.
- Xaiv Switch Stacking yog tias koj xav tau kev tswj hwm yooj yim, cov keyboards tib-rack, thiab bandwidth siab rau cov txheej nkag mus - zoo tagnrho rau SMBs thiab cov txheej nkag mus rau hauv tuam txhab.
- Xaiv MLAG yog tias koj xav tau lub sijhawm tsis ua haujlwm, qhov deb yooj ywm, thiab qhov scalability—zoo meej rau cov chaw khaws ntaub ntawv, cov qauv tsim ntawm cov ceg ntoo, thiab cov tes hauj lwm tseem ceeb.
Yog li ntawd, tsis muaj "ib qho loj-haum-txhua tus" Txheej 2 redundancy kev daws teeb meem - STP, MLAG, thiab Stacking txhua tus zoo hauv ntau qhov xwm txheej sib txawv. STP yog qhov kev xaiv txhim khu kev qha, pheej yig rau cov kev xav tau yooj yim; Stacking ua kom yooj yim kev tswj hwm rau tib qhov chaw hloov pauv; thiab MLAG xa qhov kev ntseeg siab tshaj plaws thiab kev ywj pheej rau cov tes hauj lwm tseem ceeb. Los ntawm kev soj ntsuam koj cov kev xav tau kev ntseeg siab, qhov chaw hloov pauv, cov peev txheej tswj hwm, thiab cov peev nyiaj, koj tuaj yeem xaiv qhov kev daws teeb meem uas ua rau koj lub network muaj zog, ua haujlwm tau zoo, thiab yav tom ntej-pov thawj.
Xav tau kev pab siv koj txoj kev npaj ua haujlwm Layer 2 redundancy? Tiv tauj peb cov kws tshaj lij hauv network kom tau txais cov lus qhia tshwj xeeb rau koj cov khoom siv tshwj xeeb.
Lub sijhawm tshaj tawm: Lub Ob Hlis-26-2026
