{"id":22555,"date":"2024-12-17T19:43:31","date_gmt":"2024-12-17T16:43:31","guid":{"rendered":"https:\/\/www.cenuta.com\/blog\/?p=22555"},"modified":"2024-12-17T19:43:33","modified_gmt":"2024-12-17T16:43:33","slug":"bgpnin-calisma-prensibi","status":"publish","type":"post","link":"https:\/\/www.cenuta.com\/blog\/bgpnin-calisma-prensibi\/","title":{"rendered":"BGP&#8217;nin \u00c7al\u0131\u015fma Prensibi"},"content":{"rendered":"\n<p><strong>BGP (Border Gateway Protocol)<\/strong>, internet \u00fczerindeki a\u011flar aras\u0131nda y\u00f6nlendirme (routing) bilgilerini ta\u015f\u0131yan ve en iyi yolu belirleyen bir y\u00f6nlendirme protokol\u00fcd\u00fcr. BGP, <strong>politika tabanl\u0131<\/strong> \u00e7al\u0131\u015fmas\u0131 ve \u00f6l\u00e7eklenebilir yap\u0131s\u0131 sayesinde internetin omurgas\u0131n\u0131 olu\u015fturan protokold\u00fcr. Bu yaz\u0131da, BGP&#8217;nin \u00e7al\u0131\u015fma prensibini t\u00fcm detaylar\u0131yla inceleyece\u011fiz.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_71 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0130\u00e7indekiler<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a6f77eb1a6d3\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a6f77eb1a6d3\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.cenuta.com\/blog\/bgpnin-calisma-prensibi\/#1_BGPnin_Genel_Calisma_Mantigi\" title=\"1. BGP&#8217;nin Genel \u00c7al\u0131\u015fma Mant\u0131\u011f\u0131\">1. BGP&#8217;nin Genel \u00c7al\u0131\u015fma Mant\u0131\u011f\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.cenuta.com\/blog\/bgpnin-calisma-prensibi\/#2_BGP_Peer_Komsuluk_Iliskisi\" title=\"2. BGP Peer (Kom\u015fuluk) \u0130li\u015fkisi\">2. BGP Peer (Kom\u015fuluk) \u0130li\u015fkisi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.cenuta.com\/blog\/bgpnin-calisma-prensibi\/#3_BGP_Finite_State_Machine_FSM_%E2%80%93_Durum_Makineleri\" title=\"3. BGP Finite State Machine (FSM) &#8211; Durum Makineleri\">3. BGP Finite State Machine (FSM) &#8211; Durum Makineleri<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.cenuta.com\/blog\/bgpnin-calisma-prensibi\/#BGP_FSM_Durumlari\" title=\"BGP FSM Durumlar\u0131:\">BGP FSM Durumlar\u0131:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.cenuta.com\/blog\/bgpnin-calisma-prensibi\/#4_BGP_Mesaj_Turleri\" title=\"4. BGP Mesaj T\u00fcrleri\">4. BGP Mesaj T\u00fcrleri<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.cenuta.com\/blog\/bgpnin-calisma-prensibi\/#5_BGP_Path_Attributes_Yol_Nitelikleri\" title=\"5. BGP Path Attributes (Yol Nitelikleri)\">5. BGP Path Attributes (Yol Nitelikleri)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.cenuta.com\/blog\/bgpnin-calisma-prensibi\/#Temel_Path_Attributes\" title=\"Temel Path Attributes:\">Temel Path Attributes:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.cenuta.com\/blog\/bgpnin-calisma-prensibi\/#6_BGP_Best_Path_Selection_En_Iyi_Yol_Secimi\" title=\"6. BGP Best Path Selection (En \u0130yi Yol Se\u00e7imi)\">6. BGP Best Path Selection (En \u0130yi Yol Se\u00e7imi)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.cenuta.com\/blog\/bgpnin-calisma-prensibi\/#Sonuc\" title=\"Sonu\u00e7\">Sonu\u00e7<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_BGPnin_Genel_Calisma_Mantigi\"><\/span><strong>1. BGP&#8217;nin Genel \u00c7al\u0131\u015fma Mant\u0131\u011f\u0131<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>BGP, farkl\u0131 otonom sistemler (AS &#8211; Autonomous Systems) aras\u0131nda y\u00f6nlendirme tablolar\u0131n\u0131 de\u011fi\u015f toku\u015f ederek en iyi yolu belirler. Di\u011fer y\u00f6nlendirme protokollerinden farkl\u0131 olarak BGP:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Distance Vector (Mesafe Vekt\u00f6r)<\/strong> protokol\u00fc yerine <strong>Path Vector (Yol Vekt\u00f6r)<\/strong> mant\u0131\u011f\u0131yla \u00e7al\u0131\u015f\u0131r.<\/li>\n\n\n\n<li>Y\u00f6nlendirme kararlar\u0131n\u0131 <strong>politika tabanl\u0131<\/strong> verir.<\/li>\n\n\n\n<li>IP prefix\u2019lerini ve yollar\u0131n\u0131 ta\u015f\u0131yarak a\u011f\u0131n global y\u00f6nlendirme tablolar\u0131n\u0131 olu\u015fturur.<\/li>\n<\/ul>\n\n\n\n<p>BGP, y\u00f6nlendirme kararlar\u0131n\u0131 <strong>Path Attributes<\/strong> (Yol Nitelikleri) kullanarak al\u0131r. Bu nitelikler sayesinde a\u011f y\u00f6neticileri, trafik ak\u0131\u015f\u0131n\u0131 kontrol edebilir.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_BGP_Peer_Komsuluk_Iliskisi\"><\/span><strong>2. BGP Peer (Kom\u015fuluk) \u0130li\u015fkisi<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>BGP&#8217;nin \u00e7al\u0131\u015fmas\u0131 i\u00e7in iki y\u00f6nlendirici aras\u0131nda <strong>BGP Peer<\/strong> ili\u015fkisi kurulmas\u0131 gerekir. Bu ili\u015fkiyi kurmak i\u00e7in BGP, <strong>TCP 179<\/strong> portunu kullan\u0131r. \u0130ki y\u00f6nlendirici aras\u0131ndaki ba\u011flant\u0131 kurulduktan sonra BGP, y\u00f6nlendirme bilgilerini payla\u015fmaya ba\u015flar.<\/p>\n\n\n\n<p>BGP kom\u015fuluk t\u00fcrleri:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>eBGP (External BGP):<\/strong> Farkl\u0131 otonom sistemler (AS\u2019ler) aras\u0131nda kurulan ba\u011flant\u0131d\u0131r.<\/li>\n\n\n\n<li><strong>iBGP (Internal BGP):<\/strong> Ayn\u0131 otonom sistem i\u00e7indeki y\u00f6nlendiriciler aras\u0131nda kurulan ba\u011flant\u0131d\u0131r.<\/li>\n<\/ol>\n\n\n\n<p><strong>Kom\u015fuluk (Peering) Kurulumu Ad\u0131mlar\u0131:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Y\u00f6nlendiriciler, TCP ba\u011flant\u0131s\u0131 ba\u015flat\u0131r.<\/li>\n\n\n\n<li>OPEN mesaj\u0131 ile BGP oturumu kurulur.<\/li>\n\n\n\n<li>Oturum kurulduktan sonra y\u00f6nlendirme bilgileri <strong>UPDATE<\/strong> mesajlar\u0131 ile payla\u015f\u0131l\u0131r.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_BGP_Finite_State_Machine_FSM_%E2%80%93_Durum_Makineleri\"><\/span><strong>3. BGP Finite State Machine (FSM) &#8211; Durum Makineleri<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>BGP, kom\u015fuluk kurulumu s\u0131ras\u0131nda <strong>Finite State Machine (FSM)<\/strong> ad\u0131 verilen bir dizi durumu takip eder. FSM, BGP kom\u015fuluk ili\u015fkisini kurmak ve s\u00fcrd\u00fcrmek i\u00e7in kullan\u0131l\u0131r.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"BGP_FSM_Durumlari\"><\/span><strong>BGP FSM Durumlar\u0131:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Idle:<\/strong>\n<ul class=\"wp-block-list\">\n<li>BGP oturumu kapal\u0131d\u0131r.<\/li>\n\n\n\n<li>Kom\u015fu ile ba\u011flant\u0131 kurmaya haz\u0131rd\u0131r.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Connect:<\/strong>\n<ul class=\"wp-block-list\">\n<li>TCP ba\u011flant\u0131s\u0131 ba\u015flat\u0131l\u0131r.<\/li>\n\n\n\n<li>Ba\u011flant\u0131 ba\u015far\u0131l\u0131 olursa, <strong>OpenSent<\/strong> durumuna ge\u00e7er.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Active:<\/strong>\n<ul class=\"wp-block-list\">\n<li>TCP ba\u011flant\u0131s\u0131 ba\u015far\u0131s\u0131z olursa tekrar denenir.<\/li>\n\n\n\n<li>Ba\u011flant\u0131 ba\u015far\u0131l\u0131 olmazsa Idle durumuna geri d\u00f6ner.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>OpenSent:<\/strong>\n<ul class=\"wp-block-list\">\n<li>OPEN mesaj\u0131 g\u00f6nderilir ve kom\u015fudan cevap beklenir.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>OpenConfirm:<\/strong>\n<ul class=\"wp-block-list\">\n<li>OPEN mesaj\u0131 do\u011fruland\u0131ktan sonra KEEPALIVE mesajlar\u0131 de\u011fi\u015f toku\u015f edilir.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Established:<\/strong>\n<ul class=\"wp-block-list\">\n<li>BGP oturumu ba\u015far\u0131yla kurulur.<\/li>\n\n\n\n<li>Art\u0131k UPDATE mesajlar\u0131 ile y\u00f6nlendirme bilgileri payla\u015f\u0131l\u0131r.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>Durum Ge\u00e7i\u015fi \u00d6rne\u011fi:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">code<code>Idle --> Connect --> Active --> OpenSent --> OpenConfirm --> Established<br><\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_BGP_Mesaj_Turleri\"><\/span><strong>4. BGP Mesaj T\u00fcrleri<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>BGP, kom\u015fular\u0131 ile ileti\u015fim kurmak ve y\u00f6nlendirme tablolar\u0131n\u0131 payla\u015fmak i\u00e7in d\u00f6rt ana mesaj t\u00fcr\u00fc kullan\u0131r:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>OPEN Mesaj\u0131:<\/strong>\n<ul class=\"wp-block-list\">\n<li>BGP kom\u015fulu\u011funu ba\u015flatmak i\u00e7in g\u00f6nderilir.<\/li>\n\n\n\n<li>ASN (Otonom Sistem Numaras\u0131), BGP s\u00fcr\u00fcm\u00fc ve oturum parametreleri i\u00e7erir.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>KEEPALIVE Mesaj\u0131:<\/strong>\n<ul class=\"wp-block-list\">\n<li>BGP kom\u015fular\u0131n\u0131n ba\u011flant\u0131s\u0131n\u0131n canl\u0131 oldu\u011funu kontrol eder.<\/li>\n\n\n\n<li>Her 60 saniyede bir g\u00f6nderilir.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>UPDATE Mesaj\u0131:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Yeni y\u00f6nlendirme bilgilerini ta\u015f\u0131r.<\/li>\n\n\n\n<li>Bir y\u00f6nlendirme bilgisini ekler veya geri \u00e7eker.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>NOTIFICATION Mesaj\u0131:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Bir hata tespit edildi\u011finde g\u00f6nderilir.<\/li>\n\n\n\n<li>BGP oturumunu kapat\u0131r.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>\u00d6rnek BGP Kom\u015fuluk Kurulumu:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>Router A ------> OPEN ------> Router B  <br>Router B &lt;------ KEEPALIVE &lt;------ Router A  <br>Router A ------> UPDATE ------> Router B  <br><\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_BGP_Path_Attributes_Yol_Nitelikleri\"><\/span><strong>5. BGP Path Attributes (Yol Nitelikleri)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>BGP, bir hedefe giden en iyi yolu belirlerken <strong>Path Attributes<\/strong> (Yol Nitelikleri) ad\u0131 verilen parametreleri kullan\u0131r. Bu nitelikler, BGP&#8217;nin politika tabanl\u0131 y\u00f6nlendirme yapmas\u0131n\u0131 sa\u011flar.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Temel_Path_Attributes\"><\/span><strong>Temel Path Attributes:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>AS_PATH:<\/strong> Yoldan ge\u00e7en AS\u2019lerin listesidir. En k\u0131sa AS_PATH\u2019e sahip olan yol tercih edilir.<\/li>\n\n\n\n<li><strong>NEXT_HOP:<\/strong> Hedefe ula\u015fmak i\u00e7in kullan\u0131lacak sonraki y\u00f6nlendiriciyi g\u00f6sterir.<\/li>\n\n\n\n<li><strong>LOCAL_PREF:<\/strong> iBGP&#8217;de tercih edilen yolu belirlemek i\u00e7in kullan\u0131l\u0131r. En y\u00fcksek de\u011fere sahip olan yol se\u00e7ilir.<\/li>\n\n\n\n<li><strong>MULTI_EXIT_DISC (MED):<\/strong> eBGP oturumlar\u0131nda en iyi yolu belirlemek i\u00e7in kullan\u0131l\u0131r. En d\u00fc\u015f\u00fck MED de\u011feri tercih edilir.<\/li>\n\n\n\n<li><strong>ORIGIN:<\/strong> Rotan\u0131n kayna\u011f\u0131n\u0131 belirtir (IGP, EGP veya \u0130ncomplete).<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6_BGP_Best_Path_Selection_En_Iyi_Yol_Secimi\"><\/span><strong>6. BGP Best Path Selection (En \u0130yi Yol Se\u00e7imi)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>BGP, hedefe giden en iyi yolu belirlemek i\u00e7in a\u015fa\u011f\u0131daki kurallar\u0131 takip eder:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>En y\u00fcksek LOCAL_PREF de\u011feri tercih edilir.<\/strong><\/li>\n\n\n\n<li><strong>En k\u0131sa AS_PATH tercih edilir.<\/strong><\/li>\n\n\n\n<li><strong>En d\u00fc\u015f\u00fck MED (Multi-Exit Discriminator) de\u011feri tercih edilir.<\/strong><\/li>\n\n\n\n<li><strong>iBGP\u2019den \u00f6\u011frenilen rotalar, eBGP\u2019den \u00f6\u011frenilen rotalara g\u00f6re \u00f6nceliklidir.<\/strong><\/li>\n\n\n\n<li><strong>En d\u00fc\u015f\u00fck IGP metri\u011fine sahip NEXT_HOP tercih edilir.<\/strong><\/li>\n\n\n\n<li><strong>En eski BGP oturumu olan yol tercih edilir.<\/strong><\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sonuc\"><\/span><strong>Sonu\u00e7<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>BGP, d\u00fcnya \u00e7ap\u0131nda internet trafi\u011finin y\u00f6nlendirilmesini sa\u011flayan en \u00f6nemli protokold\u00fcr. Kom\u015fuluk (peering) ili\u015fkileri, BGP mesaj t\u00fcrleri ve <strong>FSM<\/strong> mant\u0131\u011f\u0131 ile \u00e7al\u0131\u015fan BGP, <strong>Path Attributes<\/strong> kullanarak politika tabanl\u0131 y\u00f6nlendirme yapar. BGP&#8217;nin \u00e7al\u0131\u015fma prensiplerini anlamak, a\u011f m\u00fchendisleri i\u00e7in a\u011f tasar\u0131m\u0131 ve y\u00f6netimi a\u00e7\u0131s\u0131ndan kritik bir ad\u0131md\u0131r.<\/p>\n\n\n\n<p>Bir sonraki ad\u0131mda, BGP yap\u0131land\u0131rmas\u0131 ve ger\u00e7ek d\u00fcnya \u00f6rnekleri \u00fczerinden konuyu detayland\u0131rabiliriz.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>BGP (Border Gateway Protocol), internet \u00fczerindeki a\u011flar aras\u0131nda y\u00f6nlendirme (routing)<a href=\"https:\/\/www.cenuta.com\/blog\/bgpnin-calisma-prensibi\/\">&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":22557,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-22555","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ipuclari"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.1 - 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