{"id":37511,"date":"2019-10-31T22:18:02","date_gmt":"2019-10-31T19:18:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/trening-cisco-200-125-ccna-v3-0-den-23-peredovye-tehnologii-marshrutizatsii\/"},"modified":"2019-10-31T22:18:02","modified_gmt":"2019-10-31T19:18:02","slug":"trening-cisco-200-125-ccna-v3-0-den-23-peredovye-tehnologii-marshrutizatsii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/administrirovanie\/trening-cisco-200-125-ccna-v3-0-den-23-peredovye-tehnologii-marshrutizatsii","title":{"rendered":"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ast\u0103zi, vom explora mai \u00eendeaproape c\u00e2teva aspecte ale rut\u0103rii. \u00cenainte de a \u00eencepe, vreau s\u0103 r\u0103spund la \u00eentrebarea studen\u021bilor despre paginile mele de socializare. Am plasat pe st\u00e2nga linkurile c\u0103tre paginile companiei noastre \u0219i pe dreapta \u2013 c\u0103tre paginile mele personale. Men\u021bionez c\u0103 nu adaug o persoan\u0103 la prietenii mei pe Facebook dac\u0103 nu o cunosc personal, a\u0219a c\u0103 nu trimite\u021bi cereri de prietenie. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/7cf0f37b302c1db462796e27489be016.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPute\u021bi s\u0103 v\u0103 abona\u021bi la pagina mea de Facebook \u0219i s\u0103 fi\u021bi la curent cu toate evenimentele. R\u0103spund la mesajele primite pe contul meu de LinkedIn, a\u0219a c\u0103 m\u0103 pute\u021bi contacta acolo, \u0219i desigur, sunt foarte activ pe Twitter. Sub acest video sunt linkuri c\u0103tre toate cele 6 re\u021bele sociale, a\u0219a c\u0103 le pute\u021bi utiliza. <noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>A\u0219a cum se obi\u0219nuie\u0219te, ast\u0103zi vom studia trei subiecte. Primul este explica\u021bia conceptului de rutare, unde v\u0103 voi vorbi despre tabelele de rutare, rutarea static\u0103 \u0219i a\u0219a mai departe. Apoi, vom explora rutarea \u00eentre comutatoare, adic\u0103 modul \u00een care se face rutarea \u00eentre dou\u0103 switch-uri. La finalul lec\u021biei, ne vom familiariza cu conceptul de rutare Inter-VLAN, c\u00e2nd un switch interac\u021bioneaz\u0103 cu mai multe VLAN-uri \u0219i cum are loc leg\u0103tura \u00eentre aceste re\u021bele. Este un subiect foarte interesant \u0219i s-ar putea s\u0103 dori\u021bi s\u0103-l revizui\u021bi de c\u00e2teva ori. Exist\u0103 \u0219i un alt subiect interesant, care se nume\u0219te Router-on-a-Stick. <\/p>\n<p>Deci, ce este o tabl\u0103 de rutare? Este o tabl\u0103 pe baza c\u0103reia routerele iau decizii de rutare. Vezi cum arat\u0103 o tabl\u0103 tipic\u0103 de rutare a routerelor Cisco. Fiecare computer cu Windows are, de asemenea, o tabl\u0103 de rutare, dar aceasta este o alt\u0103 tem\u0103. <\/p>\n<p>Litera R la \u00eenceputul liniei \u00eenseamn\u0103 c\u0103 ruta c\u0103tre re\u021beaua 192.168.30.0\/24 este asigurat\u0103 de protocolul RIP, C \u00eenseamn\u0103 c\u0103 re\u021beaua este conectat\u0103 direct la interfa\u021ba routerului, S \u00eenseamn\u0103 rutare static\u0103, iar punctul de dup\u0103 aceast\u0103 liter\u0103 indic\u0103 c\u0103 aceast\u0103 rut\u0103 este candidatul default pentru rutarea static\u0103. Exist\u0103 mai multe tipuri de rute statice, iar ast\u0103zi ne vom familiariza cu ele. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/e6391559c46590c8f43136439b6f0cf1.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nS\u0103 lu\u0103m ca exemplu prima re\u021bea 192.168.30.0\/24. \u00cen linie vede\u021bi dou\u0103 numere \u00een paranteze p\u0103trate, desp\u0103r\u021bite printr-un slash, despre care am mai vorbit. Primul num\u0103r, 120, reprezint\u0103 distan\u021ba administrativ\u0103, caracteriz\u00e2nd gradul de \u00eencredere \u00een aceast\u0103 rut\u0103. S\u0103 presupunem c\u0103 \u00een tabel mai exist\u0103 o rut\u0103 c\u0103tre aceast\u0103 re\u021bea, marcat\u0103 cu litera C sau S, av\u00e2nd o distan\u021b\u0103 administrativ\u0103 mai mic\u0103, de exemplu, 1, a\u0219a cum este \u00een cazul rut\u0103rii statice. \u00cen acest tabel nu ve\u021bi \u00eent\u00e2lni dou\u0103 re\u021bele identice, dac\u0103 nu folosim un mecanism precum balansarea \u00eenc\u0103rc\u0103rii, dar s\u0103 presupunem c\u0103 avem 2 \u00eenregistr\u0103ri pentru aceea\u0219i re\u021bea. A\u0219adar, dac\u0103 vede\u021bi un num\u0103r mai mic, acest lucru va \u00eensemna c\u0103 ruta respectiv\u0103 merit\u0103 mai mult\u0103 \u00eencredere, iar invers, cu c\u00e2t valoarea distan\u021bei administrative este mai mare, cu at\u00e2t ruta respectiv\u0103 merit\u0103 o \u00eencredere mai mic\u0103. Mai departe, \u00een linie este specificat prin ce interfa\u021b\u0103 ar trebui s\u0103 se trimit\u0103 traficul \u2013 \u00een cazul nostru, este portul 192.168.20.1 FastEthernet0\/1. Acestea sunt componentele din care este format tabelul de rutare. <\/p>\n<p>Acum s\u0103 discut\u0103m despre cum routerul ia decizii de rutare. Mai sus am men\u021bionat candidatul implicit \u0219i acum voi explica ce \u00eenseamn\u0103 acesta. S\u0103 presupunem c\u0103 routerul prime\u0219te trafic pentru re\u021beaua 30.1.1.1, a c\u0103rei \u00eenregistrare lipse\u0219te \u00een tabelul de rutare. \u00cen mod normal, routerul va respinge acest trafic, dar dac\u0103 \u00een tabel exist\u0103 o \u00eenregistrare pentru candidatul implicit, acest lucru \u00eenseamn\u0103 c\u0103 tot ce routerul nu \u0219tie va fi trimis c\u0103tre candidatul implicit. \u00cen acest caz, \u00eenregistrarea indic\u0103 faptul c\u0103 traficul destinat re\u021belei necunoscute pentru router trebuie s\u0103 fie direc\u021bionat mai departe prin portul 192.168.10.1. Astfel, traficul pentru re\u021beaua 30.1.1.1 va urma calea candidatul implicit. <\/p>\n<p>C\u00e2nd un router prime\u0219te o solicitare de conectare cu o anumit\u0103 adres\u0103 IP, \u00een primul r\u00e2nd verific\u0103 dac\u0103 acea adres\u0103 se afl\u0103 \u00eentr-o anumit\u0103 rut\u0103. Astfel, c\u00e2nd prime\u0219te trafic pentru re\u021beaua 30.1.1.1, el va verifica mai \u00eent\u00e2i dac\u0103 adresa sa se afl\u0103 \u00een \u00eenregistr\u0103rile tabelului de rutare. De exemplu, dac\u0103 routerul prime\u0219te trafic pentru 192.168.30.1, dup\u0103 ce verific\u0103 toate \u00eenregistr\u0103rile, va observa c\u0103 aceast\u0103 adres\u0103 se afl\u0103 \u00een intervalul de adrese al re\u021belei 192.168.30.0\/24, dup\u0103 care va trimite traficul prin aceast\u0103 rut\u0103. Neav\u00e2nd \u00eenregistr\u0103ri specifice pentru re\u021beaua 30.1.1.1, routerul va trimite traficul destinat acesteia prin ruta candidat\u0103 de tip default. Iat\u0103 cum se iau deciziile: mai \u00eent\u00e2i se consult\u0103 \u00eenregistr\u0103rile rutei specifice, iar apoi se folose\u0219te ruta candidat\u0103 de tip default. <br \/>\nAcum s\u0103 analiz\u0103m diferitele tipuri de rute statice. Primul tip este ruta default, sau ruta implicit\u0103. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/53637c4de659fc028ff907ebec3954f1.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nA\u0219a cum am spus, dac\u0103 routerul prime\u0219te trafic destinat unei re\u021bele necunoscute, acesta \u00eel va trimite prin ruta implicit\u0103. Anun\u021bul c\u0103 a fost setat\u0103 o rut\u0103 implicit\u0103 apare \u00een \u00eenregistrarea Gateway of last resort is 192.168.10.1 to network 0.0.0.0, adic\u0103 \u201eGateway-ul ultimului recurs pentru re\u021beaua 0.0.0.0 are adresa IP 192.168.10.1\u201d. Aceast\u0103 rut\u0103 este specificat\u0103 \u00een ultima linie a tabelului de rutare, marcat\u0103 cu litera S urmat\u0103 de un punct. <\/p>\n<p>Aceast\u0103 op\u021biune poate fi definit\u0103 din modul de configurare global. Pentru o rut\u0103 obi\u0219nuit\u0103 folosind protocolul RIP, trebuie s\u0103 introduce\u021bi comanda ip route, specific\u00e2nd identificatorul re\u021belei corespunz\u0103toare, \u00een cazul nostru 192.168.30.0, \u0219i masca de subre\u021bea 255.255.255.0, apoi specifica\u021bi 192.168.20.1 ca next hop. Cu toate acestea, c\u00e2nd seta\u021bi ruta implicit\u0103, nu trebuie s\u0103 specifica\u021bi identificatorul re\u021belei \u0219i masca; pur \u0219i simplu introduce\u021bi ip route 0.0.0.0 0.0.0.0, adic\u0103 \u00een locul mascii de subre\u021bea introduce\u021bi din nou patru zerouri, iar la finalul liniei specifica\u021bi adresa 192.168.20.1, care va reprezenta ruta implicit\u0103. <br \/>\nUrm\u0103torul tip de rut\u0103 static\u0103 este Ruta de Re\u021bea, sau Network Route. Pentru a stabili o rut\u0103 de re\u021bea, este necesar s\u0103 specifica\u021bi o \u00eentreag\u0103 re\u021bea, adic\u0103 s\u0103 folosi\u021bi comanda ip route 192.168.30.0 255.255.255.0, unde 0 de la sf\u00e2r\u0219itul m\u0103\u0219tii de subre\u021bea indic\u0103 \u00eentreaga gam\u0103 de 256 adrese din re\u021bea \/24, \u0219i s\u0103 indica\u021bi adresa IP a urm\u0103torului hop.<\/p>\n<p>Acum voi desena un \u0219ablon care ilustreaz\u0103 comanda de configurare a rutei implicite \u0219i a rutei de re\u021bea. Arat\u0103 astfel:<\/p>\n<p>ip route prima parte a adresei a doua parte a adresei . <\/p>\n<p>Pentru ruta implicit\u0103, at\u00e2t prima, c\u00e2t \u0219i a doua parte a adresei vor fi 0.0.0.0, iar pentru ruta de re\u021bea prima parte reprezint\u0103 identificatorul re\u021belei, iar a doua parte \u2013 masca de subre\u021bea. Apoi va fi specificat\u0103 IP-ul re\u021belei c\u0103tre care routerul decide s\u0103 fac\u0103 urm\u0103torul hop. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/cd763f2669b4a218d6af5c1c0791e6fd.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPentru configurarea rutei gazdei, este utilizat\u0103 IP-ul unui anumit gazd\u0103. \u00cen \u0219ablonul comenzii, aceasta va fi prima parte a adresei, \u00een cazul nostru 192.168.30.1, care indic\u0103 un dispozitiv specific. A doua parte reprezint\u0103 masca de subre\u021bea 255.255.255.255, care de asemenea indic\u0103 IP-ul unui anumit gazd\u0103, nu al unei \u00eentregi re\u021bele \/24. Apoi trebuie specificat IP-ul urm\u0103torului hop. A\u0219a se poate stabili ruta gazdei. <\/p>\n<p>Ruta sumar\u0103 este o rut\u0103 agregat\u0103. \u00ce\u021bi aminte\u0219ti c\u0103 am discutat despre sumarizarea rutelor, atunci c\u00e2nd avem o anumit\u0103 gam\u0103 de adrese IP? S\u0103 lu\u0103m, de exemplu, prima re\u021bea 192.168.30.0\/24 \u0219i s\u0103 presupunem c\u0103 avem un router R1, la care este conectat\u0103 re\u021beaua 192.168.30.0\/24 cu patru adrese IP: 192.168.30.4, 192.168.30.5, 192.168.30.6 \u0219i 192.168.30.7. Slash-ul 24 \u00eenseamn\u0103 c\u0103 \u00een aceast\u0103 re\u021bea exist\u0103 256 de adrese valide, dar \u00een acest caz avem doar 4 adrese IP. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/59f6ca631681e804e22bb4c360139da9.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDac\u0103 a\u0219 spune c\u0103 tot traficul pentru re\u021beaua 192.168.30.0\/24 trebuie s\u0103 fie direc\u021bionat prin aceast\u0103 rut\u0103, ar fi o minciun\u0103, deoarece o adres\u0103 IP, cum ar fi 192.168.30.1, poate s\u0103 nu fie disponibil\u0103 prin aceast\u0103 interfa\u021b\u0103. De aceea, \u00een acest caz, nu putem folosi 192.168.30.0 ca prima parte a adresei, ci trebuie s\u0103 specific\u0103m ce adrese exacte vor fi disponibile. \u00cen acest caz, cele 4 adrese specifice vor fi accesibile prin interfa\u021ba din dreapta, iar celelalte adrese ale re\u021belei \u2013 prin interfa\u021ba din st\u00e2nga a routerului. De aceea, trebuie s\u0103 configur\u0103m o rut\u0103 agregat\u0103 sau sumar\u0103.<\/p>\n<p>Din principiile sumariz\u0103rii rutelor, ne amintim c\u0103 \u00een aceea\u0219i subre\u021bea primele trei octete ale adresei r\u0103m\u00e2n constante \u0219i trebuie s\u0103 cre\u0103m o subre\u021bea care s\u0103 uneasc\u0103 toate cele 4 adrese. Pentru aceasta, trebuie s\u0103 specific\u0103m \u00een prima parte a adresei 192.168.30.4, iar \u00een a doua parte s\u0103 folosim masca subre\u021belei 255.255.255.252, unde 252 \u00eenseamn\u0103 c\u0103 \u00een aceast\u0103 subre\u021bea sunt incluse 4 adrese IP: .4, .5, .6 \u0219i .7.<\/p>\n<p>Dac\u0103 \u00een tabelul de rutare ve\u021bi avea dou\u0103 \u00eenregistr\u0103ri: ruta RIP pentru re\u021beaua 192.168.30.0\/24 \u0219i ruta sumarizat\u0103 192.168.30.4\/252, atunci, conform principiilor de rutare, ruta prioritar\u0103 pentru un anumit trafic va fi ruta Sumarizat\u0103. Tot ceea ce nu se va referi la acest trafic specific va folosi ruta de re\u021bea. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/5ee43aa93363dc9dc2d2cb5d543e6e3c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nIat\u0103 ce reprezint\u0103 o rut\u0103 sumarizat\u0103 \u2013 suma\u021bi mai multe adrese IP specifice \u0219i crea\u021bi pentru ele o rut\u0103 separat\u0103. <\/p>\n<p>\u00cen grupul rutelor statice exist\u0103 a\u0219a-numita \u201erut\u0103 flotant\u0103\u201d, sau Ruta Flotant\u0103. Aceasta este o rut\u0103 de rezerv\u0103. Ea este folosit\u0103 \u00een cazul apari\u021biei unor probleme cu conexiunea fizic\u0103 prin ruta static\u0103, care are o distan\u021b\u0103 administrativ\u0103 de 1. \u00cen exemplul nostru, aceasta este ruta prin adresa IP 192.168.10.1 din ultima linie a tabelului de rutare, iar \u00een cazul \u00een care aceast\u0103 rut\u0103 se \u00eentrerupe la nivel fizic, se folose\u0219te ruta flotant\u0103 de rezerv\u0103. <\/p>\n<p>Pentru a activa ruta de rezerv\u0103, la sf\u00e2r\u0219itul r\u00e2ndului comenzii, \u00een loc de adresa IP a urm\u0103torului hop, care \u00een mod implicit are o valoare de 1, se indic\u0103 o alt\u0103 valoare a hopului, de exemplu, 5. Ruta flotant\u0103 nu apare \u00een tabelul de rutare, deoarece este utilizat\u0103 doar atunci c\u00e2nd ruta static\u0103 devine inaccesibil\u0103 din cauza defect\u0103rii. <\/p>\n<p>Dac\u0103 nu a\u021bi \u00een\u021beles ceva din ceea ce am discutat, viziona\u021bi din nou acest videoclip. Dac\u0103 ave\u021bi \u00eentreb\u0103ri, \u00eemi pute\u021bi trimite un e-mail \u0219i v\u0103 voi explica tot. <\/p>\n<p>\u0218i acum haide\u021bi s\u0103 analiz\u0103m rutarea Inter-Switch. \u00cen st\u00e2nga diagramei se afl\u0103 un switch care deserveste re\u021beaua albastr\u0103 a departamentului de v\u00e2nz\u0103ri. Pe dreapta se afl\u0103 un alt switch care func\u021bioneaz\u0103 doar cu re\u021beaua verde a departamentului de marketing. \u00cen acest caz, se folosesc dou\u0103 switch-uri independente care deservesc departamente diferite, deoarece \u00een aceast\u0103 topologie nu se utilizeaz\u0103 o re\u021bea VLAN comun\u0103. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/7b6fc5b0cd852c88e93cd13af329f8c8.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDac\u0103 trebuie s\u0103 stabili\u021bi o conexiune \u00eentre aceste dou\u0103 switch-uri, adic\u0103 \u00eentre cele dou\u0103 re\u021bele diferite 192.168.1.0\/24 \u0219i 192.168.2.0\/24, atunci este necesar s\u0103 folosi\u021bi un router. Astfel, aceste re\u021bele vor putea schimba pachete \u0219i accesa internetul prin routerul R1. Dac\u0103 am fi folosit VLAN1 ca default pentru ambele switch-uri, leg\u00e2ndu-le cu un cablu fizic, acestea ar fi putut comunica \u00eentre ele. Dar, din moment ce acest lucru este tehnic imposibil din cauza separ\u0103rii re\u021belelor ce apar\u021bin unor domenii de difuzare diferite, este necesar un router pentru comunicarea lor.<\/p>\n<p>S\u0103 presupunem c\u0103 fiecare dintre switch-uri are c\u00e2te 16 porturi. \u00cen cazul nostru, nu folosim 14 porturi, deoarece fiecare departament are doar c\u00e2te 2 computere. Prin urmare, \u00een acest caz, este optim s\u0103 utiliz\u0103m VLAN, a\u0219a cum este ar\u0103tat \u00een diagrama urm\u0103toare. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/0d22c049aaa83648512d1dee5f0771aa.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00cen acest caz, re\u021beaua albastr\u0103 VLAN10 \u0219i re\u021beaua verde VLAN20 au propriul lor domeniu de difuzare. Re\u021beaua VLAN10 este conectat\u0103 cu un cablu la unul dintre porturile routerului, iar re\u021beaua VLAN20 la alt port, cu ambele cabluri provenind din diferite porturi ale switch-ului. Se pare c\u0103, datorit\u0103 acestei solu\u021bii excelente, am stabilit o conexiune \u00eentre re\u021bele. Totu\u0219i, deoarece routerul are un num\u0103r limitat de porturi, utilizarea acestui dispozitiv este extrem de ineficient\u0103. <\/p>\n<p>Exist\u0103 o solu\u021bie mai eficient\u0103 - \u201erouterul pe un b\u0103\u021b\u201d. \u00cen acest caz, conect\u0103m un port al switch-ului cu trunk la unul dintre porturile routerului. Am men\u021bionat deja c\u0103, \u00een mod implicit, routerul nu \u00een\u021belege \u00eencapsularea conform standardului .1Q, a\u0219a c\u0103 pentru a comunica cu el trebuie s\u0103 folosim trunk. \u00cen acest fel, se \u00eent\u00e2mpl\u0103 urm\u0103toarele.<\/p>\n<p>Re\u021beaua VLAN10 trimite traficul prin switch c\u0103tre interfata F0\/0 a routerului. Aceast\u0103 port este \u00eemp\u0103r\u021bit \u00een subinterfe\u021be (sub-interface), fiecare av\u00e2nd o adres\u0103 IP situat\u0103 \u00een intervalul adreselor din re\u021beaua 192.168.1.0\/24 sau din re\u021beaua 192.168.2.0\/24. Aici apare o anumit\u0103 ambiguitate \u2013 deoarece dou\u0103 re\u021bele diferite necesit\u0103 dou\u0103 adrese IP diferite. Prin urmare, de\u0219i trunk-ul \u00eentre switch \u0219i router este creat pe o singur\u0103 interfa\u021b\u0103 fizic\u0103, trebuie s\u0103 cre\u0103m dou\u0103 subinterfe\u021be pentru fiecare VLAN. Astfel, o subinterfa\u021b\u0103 va deservi re\u021beaua VLAN10, iar cealalt\u0103 VLAN20. Pentru prima subinterfa\u021b\u0103, trebuie s\u0103 alegem o adres\u0103 IP din intervalul 192.168.1.0\/24, iar pentru a doua, din intervalul 192.168.2.0\/24. Atunci c\u00e2nd VLAN10 va trimite un pachet, gateway-ul va fi o adres\u0103 IP, iar c\u00e2nd pachetul va fi trimis de VLAN20, se va folosi a doua adres\u0103 IP ca gateway. \u00cen acest fel, \u201erouterul pe un b\u0103\u021b\u201d va decide cu privire la permiterea traficului de la fiecare dintre cele dou\u0103 computere, care apar\u021bin unor VLAN diferite. Pe scurt, \u00eemp\u0103r\u021bim o interfa\u021b\u0103 fizic\u0103 a routerului \u00een dou\u0103 sau mai multe interfe\u021be logice. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/e7f2dcd75b3fccb125a0a7c728052420.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nS\u0103 vedem cum arat\u0103 acest lucru \u00een programul Packet Tracer. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/30daf300e184916473afebf30300a31e.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAm simplificat pu\u021bin schema, a\u0219a c\u0103 avem un computer PC0 cu adresa IP 192.168.1.10 \u0219i un al doilea computer PC1 cu adresa 192.168.2.10. La configurarea switch-ului, aloc un port pentru VLAN10 \u0219i altul pentru VLAN20. Intru \u00een consola CLI \u0219i introduc comanda show ip interface brief, pentru a m\u0103 asigura c\u0103 interfe\u021bele FastEthernet0\/2 \u0219i 0\/3 sunt active. Apoi, verific baza de date VLAN \u0219i observ c\u0103 \u00een acest moment toate interfe\u021bele switch-ului sunt parte a VLAN-ului implicit. Apoi, introduc r\u00e2nd pe r\u00e2nd comenzile config t \u0219i int f0\/2 pentru a activa portul la care este conectat\u0103 VLAN-ul departamentului de v\u00e2nz\u0103ri. <\/p>\n<p>Apoi folosesc comanda switchport mode access. Modului access este utilizat implicit, a\u0219a c\u0103 doar introduc aceast\u0103 comand\u0103. Dup\u0103 aceea, introduc switchport access VLAN10, iar sistemul r\u0103spunde c\u0103, deoarece acea re\u021bea nu exist\u0103, va crea automat VLAN10. Dac\u0103 dori\u021bi s\u0103 crea\u021bi manual o re\u021bea VLAN, de exemplu, VLAN20, trebuie s\u0103 introduce\u021bi comanda vlan 20, dup\u0103 care linia de comand\u0103 se va schimba \u00een set\u0103rile re\u021belei virtuale, schimb\u00e2ndu-\u0219i antetul din Switch(config) # \u00een Switch(config-vlan) #. Apoi, trebuie s\u0103 atribui\u021bi re\u021belei create numele MARKETING cu comanda name . Apoi configur\u0103m interfa\u021ba f0\/3. Introduc consecutiv comenzile switchport mode access \u0219i switchport access vlan 20, dup\u0103 care re\u021beaua este conectat\u0103 la acest port. <\/p>\n<p>Astfel, pute\u021bi configura switch-ul \u00een dou\u0103 moduri: primul \u2013 folosind comanda switchport access vlan 10, dup\u0103 care re\u021beaua se creeaz\u0103 automat pe acest port, al doilea \u2013 c\u00e2nd mai \u00eent\u00e2i crea\u021bi re\u021beaua, iar apoi o asocia\u021bi unui port specific. <br \/>\nLa fel se poate face \u0219i cu VLAN10. M\u0103 voi \u00eentoarce \u0219i voi repeta procesul de configurare manual\u0103 pentru aceast\u0103 re\u021bea: voi intra \u00een modul de configurare global\u0103, voi introduce comanda vlan 10, apoi \u00eei voi asocia numele name SALES \u0219i a\u0219a mai departe. Acum v\u0103 voi ar\u0103ta ce se \u00eent\u00e2mpl\u0103 dac\u0103 nu face\u021bi acest lucru, adic\u0103 dac\u0103 permite\u021bi sistemului s\u0103 creeze re\u021beaua VLAN singur. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/397eceb31e9298196066f34613c5a2f9.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nObserva\u021bi c\u0103 avem ambele re\u021bele, dar a doua, pe care am creat-o manual, are numele propriu MARKETING, \u00een timp ce prima re\u021bea VLAN10 a primit numele implicit VLAN0010. Pot corecta asta, dac\u0103 acum \u00een modul de configurare global\u0103 introduc comanda name SALES. Acum observa\u021bi c\u0103 dup\u0103 aceasta prima re\u021bea \u0219i-a schimbat numele \u00een SALES. <\/p>\n<p>Acum s\u0103 ne \u00eentoarcem \u00een Packet Tracer \u0219i s\u0103 verific\u0103m dac\u0103 computerul PC0 poate comunica cu computerul PC1. Pentru aceasta, voi deschide terminalul de linie de comand\u0103 al primului computer \u0219i voi trimite un ping c\u0103tre adresa celui de-al doilea computer. <\/p>\n<p>Observ\u0103m c\u0103 ping-ul a e\u0219uat. Motivul este c\u0103 PC0 a trimis o solicitare ARP pentru adresa 192.168.2.10 prin intermediul gateway-ului 192.168.1.1. \u00cen acest moment, computerul a \u00eentrebat efectiv switch-ul cine este 192.168.1.1. Totu\u0219i, switch-ul are doar un singur port pentru re\u021beaua VLAN10, iar solicitarea primit\u0103 nu poate pleca nic\u0103ieri - ajunge pe acest port \u0219i aici moare. Computerul nu prime\u0219te un r\u0103spuns, a\u0219a c\u0103 motivul pentru e\u0219ecul ping-ului este dep\u0103\u0219irea timpului de a\u0219teptare. R\u0103spunsul nu a fost primit, deoarece \u00een re\u021beaua VLAN10 nu exist\u0103 alte dispozitive, \u00een afar\u0103 de PC0. Mai mult, chiar dac\u0103 ambele calculatoare ar fi fost parte din aceea\u0219i re\u021bea, nu s-ar fi putut conecta, deoarece au intervale diferite de adrese IP. Pentru a face acest sistem s\u0103 func\u021bioneze, trebuie s\u0103 folosim un router. <\/p>\n<p>Cu toate acestea, \u00eenainte de a ar\u0103ta cum s\u0103 activ\u0103m routerul, voi face o mic\u0103 digresiune. Voi conecta portul Fa0\/1 al switch-ului \u0219i portul Gig0\/0 al routerului cu un cablu, iar apoi voi ad\u0103uga un alt cablu care va fi conectat la portul Fa0\/4 al switch-ului \u0219i portul Gif0\/1 al routerului. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/d7f3bf3ad4a66b0ebeb5dfda83dcf6fb.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVoi lega re\u021beaua VLAN10 de portul f0\/1 al switch-ului prin introducerea comenzii int f0\/1 \u0219i switchport access vlan10, iar re\u021beaua VLAN20 de portul f0\/4, folosind comenzile int f0\/4 \u0219i switchport access vlan 20. Dac\u0103 acum ne uit\u0103m la baza de date VLAN, observ\u0103m c\u0103 re\u021beaua SALES este legat\u0103 de interfe\u021bele Fa0\/1, Fa0\/2, iar re\u021beaua MARKETING - de porturile Fa0\/3, Fa0\/4. <\/p>\n<p>S\u0103 ne \u00eentoarcem din nou la router \u0219i s\u0103 intr\u0103m \u00een set\u0103rile interfe\u021bei g0\/0, vom introduce comanda no shutdown \u0219i \u00eei vom atribui o adres\u0103 IP: ip add 192.168.1.1 255.255.255.0.<\/p>\n<p>De asemenea, vom configura interfa\u021ba g0\/1, atribuindu-i adresa ip add 192.168.2.1 255.255.255.0. Apoi, vom cere s\u0103 ne arate tabela de rutare, \u00een care acum exist\u0103 \u00eenregistr\u0103ri pentru re\u021belele 1.0 \u0219i 2.0. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/40620bc055607f4a4ca4efbd02df8720.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nS\u0103 vedem dac\u0103 acest sistem va func\u021biona. Vom a\u0219tepta p\u00e2n\u0103 c\u00e2nd ambele porturi ale switch-ului \u0219i routerului devin verzi \u0219i vom repeta ping-ul adresei IP 192.168.2.10. Dup\u0103 cum pute\u021bi observa, totul a func\u021bionat!<\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/52dadc5cb63298a66fcdc1222566d15f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nComputerul PC0 trimite o solicitare prin protocolul ARP c\u0103tre switch, switch-ul o adreseaz\u0103 routerului, care apoi trimite computerului \u00eenapoi adresa sa MAC. Dup\u0103 aceea, computerul trimite un pachet ping pe aceast\u0103 rut\u0103. Routerul \u0219tie c\u0103 re\u021beaua VLAN20 este conectat\u0103 la portul s\u0103u g0\/1, a\u0219a c\u0103 \u00eel trimite switch-ului, care redirec\u021bioneaz\u0103 pachetul c\u0103tre destina\u021bie - PC1. <\/p>\n<p>Aceast\u0103 schem\u0103 func\u021bioneaz\u0103, dar este ineficient\u0103 deoarece ocup\u0103 2 interfe\u021be ale routerului, adic\u0103 folosim ira\u021bional capacit\u0103\u021bile tehnice ale routerului. Prin urmare, voi ar\u0103ta cum se poate face acela\u0219i lucru folosind o singur\u0103 interfa\u021b\u0103. <\/p>\n<p>Voi elimina schema cu dou\u0103 cabluri \u0219i voi restaura conexiunea anterioar\u0103 dintre switch \u0219i router cu un singur cablu. Interfa\u021ba f0\/1 a switch-ului trebuie s\u0103 devin\u0103 un port trunk, a\u0219a c\u0103 m\u0103 \u00eentorc \u00een set\u0103rile switch-ului \u0219i folosesc comanda switchport mode trunk pentru acest port. Portul f0\/4 nu mai este folosit. Apoi folosim comanda show int trunk pentru a verifica dac\u0103 portul este configurat corect. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/3d2bd69a1a67135fa9612041dbbaec1f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVedem c\u0103 portul Fa0\/1 func\u021bioneaz\u0103 \u00een modul trunk conform protocolului de incapsulare 802.1q. S\u0103 ne uit\u0103m la tabela VLAN \u2013 vedem c\u0103 interfa\u021ba F0\/2 este ocupat\u0103 pentru re\u021beaua departamentului de v\u00e2nz\u0103ri VLAN10, iar interfa\u021ba f0\/3 \u2013 pentru re\u021beaua de marketing VLAN20. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/34665eb828a01c3249f22b6a2c0fc806.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00cen acela\u0219i timp, switch-ul este conectat la portul g0\/0 al routerului. \u00cen set\u0103rile routerului folosesc comenzile int g0\/0 \u0219i no ip address pentru a elimina adresa IP a acestei interfe\u021be. Dar aceast\u0103 interfa\u021b\u0103 func\u021bioneaz\u0103 \u00een continuare, nu se afl\u0103 \u00een stare de shutdown. Dac\u0103 v\u0103 aminti\u021bi, routerul trebuie s\u0103 primeasc\u0103 trafic din ambele re\u021bele \u2013 1.0 \u0219i 2.0. Deoarece switch-ul este conectat la router printr-un trunk, va primi trafic at\u00e2t din prima, c\u00e2t \u0219i din a doua re\u021bea. Totu\u0219i, ce adres\u0103 IP trebuie s\u0103 atribuim interfe\u021bei routerului \u00een acest caz? <\/p>\n<p>G0\/0 reprezint\u0103 o interfa\u021b\u0103 fizic\u0103, care implicit nu are nicio adres\u0103 IP. Prin urmare, folosim conceptul de subinterfa\u021b\u0103 logic\u0103. Dac\u0103 introduc \u00een linia de comand\u0103 int g0\/0, sistemul va oferi dou\u0103 op\u021biuni posibile pentru comand\u0103: slash \/ sau punct. Slash-ul este folosit \u00een configurarea modular\u0103 a interfe\u021belor de tip 0\/0\/0, iar punctul este folosit \u00een cazul \u00een care ave\u021bi o subinterfa\u021b\u0103.<\/p>\n<p>Dac\u0103 introduc \u00een linia de comand\u0103 int g0\/0. ?, sistemul \u00eemi va oferi un interval de numere posibile pentru subinterfa\u021ba logic\u0103 GigabitEthernet, care sunt indicate dup\u0103 punct: . Acest interval con\u021bine peste 4 miliarde de numere, adic\u0103 se pot crea at\u00e2t de multe subinterfe\u021be logice. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/fd086a600dcc994a636164ad5a744375.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVoi indica dup\u0103 punctul 10, care va \u00eensemna VLAN10. Acum am trecut la set\u0103rile subinterfe\u021bei, ceea ce se reflect\u0103 \u00een schimbarea titlului din CLI la Router (config-subif) #, \u00een acest caz se refer\u0103 la subinterfa\u021ba g0\/0.10. Acum trebuie s\u0103-i atribui o adres\u0103 IP, pentru care folosesc comanda ip add 192.168.1.1 255.255.255.0. \u00cenainte de a seta aceast\u0103 adres\u0103, trebuie s\u0103 efectuez incapsularea, astfel \u00eenc\u00e2t subinterfa\u021ba creat\u0103 de noi s\u0103 \u0219tie ce protocol de incapsulare trebuie s\u0103 utilizeze \u2014 802.1q sau ISL. Introduc \u00een linie cuv\u00e2ntul encapsulation, iar sistemul \u00eemi ofer\u0103 op\u021biunile posibile pentru aceast\u0103 comand\u0103. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/c2ee04b129e2edd087f3e2b5f85d258d.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nFolosesc comanda encapsulation dot1Q. Tehnic, introducerea acestei comenzi nu este obligatorie, dar o introduc pentru a indica routerului ce protocol trebuie aplicat pentru a lucra cu VLAN, deoarece \u00een prezent acesta func\u021bioneaz\u0103 ca un switch, gestion\u00e2nd trunchierea VLAN. Prin aceast\u0103 comand\u0103, indic\u0103m routerului c\u0103 tot traficul trebuie s\u0103 fie incapsulat prin protocolul dot1Q. Apoi, \u00een linia de comand\u0103 trebuie s\u0103 specific c\u0103 aceast\u0103 incapsulare se refer\u0103 la re\u021beaua VLAN10. Sistemul ne arat\u0103 adresa IP utilizat\u0103, iar interfa\u021ba pentru re\u021beaua VLAN10 \u00eencepe s\u0103 func\u021bioneze. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/c77a9f94ff4a36b201ecb4153f0cee77.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00cen mod similar, configurez interfa\u021ba g0\/0.20. Creez o nou\u0103 subinterfa\u021b\u0103, setez protocolul de incapsulare \u0219i stabilesc adresa IP cu comanda ip add 192.168.2.1 255.255.255.0.<\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/9ffeb14c640f847d87d9145655a6bfae.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00cen acest caz, trebuie neap\u0103rat s\u0103 elimin adresa IP a interfe\u021bei fizice, deoarece \u00een prezent interfa\u021ba fizic\u0103 \u0219i subinterfa\u021ba logic\u0103 au aceea\u0219i adres\u0103 pentru re\u021beaua VLAN20. Pentru aceasta, introduc secven\u021bial comenzile int g0\/1 \u0219i no ip address. Apoi, dezactivez aceast\u0103 interfa\u021b\u0103, deoarece nu mai avem nevoie de ea. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/2f1238fc767e92aaddba21c2885cfbbc.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nApoi, m\u0103 \u00eentorc la interfa\u021ba g0\/0.20 \u0219i \u00eei atribui o adres\u0103 IP cu comanda ip add 192.168.2.1 255.255.255.0. Acum totul va func\u021biona corect. <\/p>\n<p>Acum folosesc comanda show ip route pentru a vizualiza tabela de rutare. <\/p>\n<p><img decoding=\"async\" alt=\"Instruire Cisco 200-125 CCNA v3.0. Ziua 23. Tehnologii avansate de rutare\" src=\"\/wp-content\/uploads\/2019\/08\/4884934b63cc85d6fd50ca91d520e14c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nObserv\u0103m c\u0103 re\u021beaua 192.168.1.0\/24 este conectat\u0103 direct la subinterfa\u021ba GigabitEthernet0\/0.10, iar re\u021beaua 192.168.2.0\/24 este conectat\u0103 direct la subinterfa\u021ba GigabitEthernet0\/0.20. Acum m\u0103 voi \u00eentoarce la terminalul liniei de comand\u0103 de la PC0 \u0219i voi face ping la PC1. \u00cen acest proces, traficul ajunge la portul router-ului, care \u00eel redirec\u021bioneaz\u0103 c\u0103tre subinterfa\u021ba corespunz\u0103toare \u0219i \u00eel trimite \u00eenapoi prin switch c\u0103tre computerul PC1. Dup\u0103 cum vede\u021bi, ping-ul a avut succes. Primele dou\u0103 pachete au fost eliminate deoarece comutarea \u00eentre interfe\u021bele router-ului dureaz\u0103 ceva timp, iar dispozitivele trebuie s\u0103 \u00eenve\u021be adresele MAC, dar celelalte dou\u0103 pachete au ajuns cu succes la destina\u021bie. A\u0219a func\u021bioneaz\u0103 conceptul de \u201erouter pe un b\u0103\u021b\u201d.<\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"2_sw10F72WY\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/2_sw10F72WY\/hqdefault.jpg\" alt=\"Reda\u021bi video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><br \/>\nV\u0103 mul\u021bumim c\u0103 r\u0103m\u00e2ne\u021bi cu noi. V\u0103 plac articolele noastre? Dori\u021bi s\u0103 vede\u021bi mai multe materiale interesante? 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