{"id":34006,"date":"2019-10-31T21:55:54","date_gmt":"2019-10-31T18:55:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/printsip-raboty-protokola-vrrp\/"},"modified":"2019-10-31T21:55:54","modified_gmt":"2019-10-31T18:55:54","slug":"printsip-raboty-protokola-vrrp","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/administrirovanie\/printsip-raboty-protokola-vrrp","title":{"rendered":"Zasada dzia\u0142ania protoko\u0142u VRRP","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><b>FHRP (Protok\u00f3\u0142 Redundancji Pierwszego Hopu)<\/b> \u2014 rodzina protoko\u0142\u00f3w, kt\u00f3re s\u0105 przeznaczone do tworzenia nadmiarowo\u015bci bramy domy\u015blnej. Wsp\u00f3ln\u0105 ide\u0105 dla tych protoko\u0142\u00f3w jest po\u0142\u0105czenie kilku router\u00f3w w jeden wirtualny router z wsp\u00f3lnym adresem IP. Adres ten b\u0119dzie przypisany hostom jako adres bramy domy\u015blnej. Woln\u0105 implementacj\u0105 tej idei jest protok\u00f3\u0142 VRRP (Protok\u00f3\u0142 Redundancji Wirtualnego Routera). W tym artykule om\u00f3wimy podstawy protoko\u0142u VRRP.<\/p>\n<p><img decoding=\"async\" alt=\"Zasada dzia\u0142ania protoko\u0142u VRRP\" src=\"\/wp-content\/uploads\/2019\/05\/d9af3141a4b0573e206409ac6dbbd60f.jpg\" style=\"display:block;margin: 0 auto;\" \/><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nRoutery VRRP \u0142\u0105cz\u0105 si\u0119 w jeden wirtualny router. Wszystkie routery w grupie maj\u0105 wsp\u00f3lny wirtualny adres IP (VIP) oraz wsp\u00f3lny numer grupy lub VRID (Identyfikator Wirtualnego Routera). Jeden router mo\u017ce nale\u017ce\u0107 do kilku grup, z kt\u00f3rych ka\u017cda musi mie\u0107 swoj\u0105 unikaln\u0105 par\u0119 VIP\/VRID.<\/p>\n<p>W przypadku Cisco wirtualny router jest definiowany na interesuj\u0105cym nas interfejsie komend\u0105:<\/p>\n<pre><code class=\"plaintext\">R1(config-if)# vrrp  ip<\/code><\/pre>\n<p>\nWszystkie routery dziel\u0105 si\u0119 na dwa typy: VRRP Master i VRRP Backup. <\/p>\n<p><b>VRRP Master<\/b> \u2014 to router, kt\u00f3ry przesy\u0142a pakiety dla tej wirtualnej grupy. <\/p>\n<p><b>VRRP Backup<\/b> \u2014 to router, kt\u00f3ry czeka na pakiet od Master. Je\u015bli pakiety od Master przestaj\u0105 przychodzi\u0107, Backup stara si\u0119 przej\u015b\u0107 w stan Master. <\/p>\n<p>Router staje si\u0119 Master, je\u015bli ma najwy\u017cszy priorytet. Master nieustannie wysy\u0142a wiadomo\u015bci na adres rozg\u0142oszeniowy 224.0.0.18, aby poinformowa\u0107 routery Backup, \u017ce dzia\u0142a. Master wysy\u0142a wiadomo\u015bci zgodnie z zegarem Adver Timer, kt\u00f3ry domy\u015blnie wynosi 1 sekund\u0119. <\/p>\n<p><img decoding=\"async\" alt=\"Zasada dzia\u0142ania protoko\u0142u VRRP\" src=\"\/wp-content\/uploads\/2019\/05\/c7a60362445dd9d89fec7bdbd2ff513d.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nPrzy tym jako adres MAC nadawcy u\u017cywany jest adres grupy 00:00:5E:00:01:xx, gdzie xx to VRID w formacie szesnastkowym. W tym przyk\u0142adzie u\u017cywana jest pierwsza grupa. <\/p>\n<p><img decoding=\"async\" alt=\"Zasada dzia\u0142ania protoko\u0142u VRRP\" src=\"\/wp-content\/uploads\/2019\/05\/5d16bcf86a6ce3c8ebe8c610dfe17156.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nJe\u015bli routery Backup nie otrzymuj\u0105 wiadomo\u015bci przez trzy Adver Timer (Master Down Timer), nowym Masterem zostaje router z najwy\u017cszym priorytetem lub router z najwy\u017cszym adresem IP. W tym przypadku router Backup o wy\u017cszym priorytecie przejmie rol\u0119 Mastera o ni\u017cszym priorytecie. Jednak, gdy Backup ma wy\u0142\u0105czony tryb preempt, Backup nie przejmie roli Mastera. <\/p>\n<pre><code class=\"plaintext\">R1(config-if)# no vrrp  preempt<\/code><\/pre>\n<p>\nJe\u015bli router VRRP jest w\u0142a\u015bcicielem adresu VIP, to zawsze przejmuje rol\u0119 Master. <\/p>\n<p>Priorytet VRRP ustawiony jest w warto\u015bciach od 1 do 254. Warto\u015b\u0107 0 jest zarezerwowana na przypadki, gdy Master musi <i>zdj\u0105\u0107<\/i> ponosi odpowiedzialno\u015b\u0107 za routowanie. Warto\u015b\u0107 255 jest ustawiana routerowi, kt\u00f3ry jest w\u0142a\u015bcicielem VIP. Domy\u015blny priorytet wynosi 100, ale mo\u017ce by\u0107 ustalany administracyjnie:<\/p>\n<pre><code class=\"plaintext\">R1(config-if)#vrrp  priority<\/code><\/pre>\n<p>\nTutaj mo\u017cemy zobaczy\u0107 priorytet routera, kiedy jest on ustawiony administracyjnie:<\/p>\n<p><img decoding=\"async\" alt=\"Zasada dzia\u0142ania protoko\u0142u VRRP\" src=\"\/wp-content\/uploads\/2019\/05\/1b7d6de438b7d44ee9ae1d4a9e4fb8ca.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nA tutaj przedstawiony jest przypadek, gdy router jest w\u0142a\u015bcicielem VIP:<\/p>\n<p><img decoding=\"async\" alt=\"Zasada dzia\u0142ania protoko\u0142u VRRP\" src=\"\/wp-content\/uploads\/2019\/05\/c593d3fa9dde81fb694b3e3cb0358444.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nRouter VRRP mo\u017ce mie\u0107 trzy stany: Initialize, Backup, Master. Te stany router kolejno zmienia. <\/p>\n<p>W stanie Initialize router oczekuje na rozpocz\u0119cie pracy. Je\u015bli ten router jest w\u0142a\u015bcicielem adresu VIP (priorytet wynosi 255), to router wysy\u0142a komunikaty, \u017ce staje si\u0119 Master. Wysy\u0142a tak\u017ce <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Address_Resolution_Protocol\">gratuitous ARP-request<\/a><\/noindex>, w kt\u00f3rym adres MAC \u017ar\u00f3d\u0142a jest adresem wirtualnego routera. Nast\u0119pnie przechodzi do stanu Master. Je\u015bli router nie jest w\u0142a\u015bcicielem VIP, to przechodzi do stanu Backup. <\/p>\n<p><img decoding=\"async\" alt=\"Zasada dzia\u0142ania protoko\u0142u VRRP\" src=\"\/wp-content\/uploads\/2019\/05\/faa6941e52a9edcef72022b75333fc03.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nW stanie Backup router oczekuje na pakiety od Mastera. Router w tym stanie nie odpowiada na zapytania ARP z adresu VIP. R\u00f3wnie\u017c nie przyjmuje pakiet\u00f3w, kt\u00f3rych adresem docelowym jest adres MAC wirtualnego routera. <\/p>\n<p>Je\u015bli Backup nie otrzyma wiadomo\u015bci od Mastera w czasie Master Down Timer, to wysy\u0142a wiadomo\u015b\u0107 VRRP, \u017ce zamierza sta\u0107 si\u0119 Masterem. Nast\u0119pnie wysy\u0142a rozg\u0142oszeniowe wiadomo\u015bci VRRP, w kt\u00f3rych adres MAC \u017ar\u00f3d\u0142a odpowiada adresowi tego wirtualnego routera. W tej wiadomo\u015bci router wskazuje sw\u00f3j priorytet.<\/p>\n<p>W stanie Master router przetwarza pakiety adresowane do wirtualnego routera. Odpowiada r\u00f3wnie\u017c na zapytania ARP do VIP. Master rozsy\u0142a wiadomo\u015bci VRRP co Adver Timer, aby potwierdzi\u0107, \u017ce dzia\u0142a. <\/p>\n<pre><code class=\"plaintext\">*May 13 19:52:18.531: %VRRP-6-STATECHANGE: Et1\/0 Grp 1 stan Init -&gt; Backup\n*May 13 19:52:21.751: %VRRP-6-STATECHANGE: Et1\/0 Grp 1 stan Backup -&gt; Master<\/code><\/pre>\n<p>\nVRRP pozwala r\u00f3wnie\u017c na r\u00f3wnowa\u017cenie obci\u0105\u017cenia mi\u0119dzy kilkoma routerami. W tym celu na jednym interfejsie tworzy si\u0119 dwie grupy VRRP. Jednej grupie przypisuje si\u0119 wy\u017cszy priorytet ni\u017c drugiej. Przy tym na drugim routerze priorytet ustala si\u0119 w spos\u00f3b przeciwny. Tzn. je\u015bli na jednym routerze priorytet pierwszej grupy wynosi 100, a drugiej grupy \u2014 200, to na drugim routerze priorytet pierwszej grupy wyniesie 200, a drugiej 100. <\/p>\n<p>Jak wcze\u015bniej wspomniano, w ka\u017cdej grupie powinien by\u0107 unikalny VIP. Ostatecznie otrzymujemy dwa adresy IP obs\u0142ugiwane przez dwa routery, z kt\u00f3rych ka\u017cdy mo\u017ce pe\u0142ni\u0107 rol\u0119 domy\u015blnej bramy. <\/p>\n<p><img decoding=\"async\" alt=\"Zasada dzia\u0142ania protoko\u0142u VRRP\" src=\"\/wp-content\/uploads\/2019\/05\/2f2246fd8e673a6fd64d4c74b0a79ce2.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nPo\u0142owie komputer\u00f3w przypisywany jest jeden adres bramy domy\u015blnej, a po\u0142owie inny. W ten spos\u00f3b po\u0142owa ruchu przechodzi przez jeden router, a po\u0142owa przez drugi. W przypadku awarii jednego z router\u00f3w, drugi przejmuje funkcje obu VIP.<\/p>\n<p><img decoding=\"async\" alt=\"Zasada dzia\u0142ania protoko\u0142u VRRP\" src=\"\/wp-content\/uploads\/2019\/05\/31501226c0cb7a668ced43e38791f1c3.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nDzi\u0119ki temu VRRP umo\u017cliwia organizacj\u0119 odporno\u015bci bramy domy\u015blnej, zwi\u0119kszaj\u0105c niezawodno\u015b\u0107 sieci. A wykorzystuj\u0105c kilka wirtualnych router\u00f3w, mo\u017cna r\u00f3wnie\u017c balansowa\u0107 obci\u0105\u017cenie mi\u0119dzy rzeczywistymi routerami. Czas reakcji na awari\u0119 mo\u017cna skr\u00f3ci\u0107 poprzez zmniejszenie timer\u00f3w.<br \/>\n<br \/>\u0179r\u00f3d\u0142o: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/452490\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>FHRP (First Hop Redundancy Protocol) \u2014 \u0441\u0435\u043c\u0435\u0439\u0441\u0442\u0432\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u043e\u0432, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u044b\u0445 \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0438\u0437\u0431\u044b\u0442\u043e\u0447\u043d\u043e\u0441\u0442\u0438 \u0448\u043b\u044e\u0437\u0430 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u041e\u0431\u0449\u0435\u0439 \u0438\u0434\u0435\u0435\u0439 \u0434\u043b\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u043e\u0432 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u043e\u0432 \u0432 \u043e\u0434\u0438\u043d \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440 \u0441 \u043e\u0431\u0449\u0438\u043c IP \u0430\u0434\u0440\u0435\u0441\u043e\u043c. \u042d\u0442\u043e\u0442 IP \u0430\u0434\u0440\u0435\u0441 \u0431\u0443\u0434\u0435\u0442 \u043d\u0430\u0437\u043d\u0430\u0447\u0430\u0442\u044c\u0441\u044f \u043d\u0430 \u0445\u043e\u0441\u0442\u0430\u0445 \u043a\u0430\u043a \u0430\u0434\u0440\u0435\u0441 \u0448\u043b\u044e\u0437\u0430 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u0421\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u0434\u0430\u043d\u043d\u043e\u0439 \u0438\u0434\u0435\u0438 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b VRRP (Virtual Router Redundancy Protocol). [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":25663,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-34006","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"FHRP (First Hop Redundancy Protocol) \u2014 \u0441\u0435\u043c\u0435\u0439\u0441\u0442\u0432\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u043e\u0432, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u044b\u0445 \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0438\u0437\u0431\u044b\u0442\u043e\u0447\u043d\u043e\u0441\u0442\u0438 \u0448\u043b\u044e\u0437\u0430 \u043f\u043e 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