{"id":19247,"date":"2022-11-03T13:37:16","date_gmt":"2022-11-03T13:37:16","guid":{"rendered":"https:\/\/news.lacnic.net\/?p=19247"},"modified":"2023-03-21T13:38:55","modified_gmt":"2023-03-21T13:38:55","slug":"uma-mudanca-interessante-esta-chegando-no-bgp","status":"publish","type":"post","link":"https:\/\/blog.lacnic.net\/pt-br\/uma-mudanca-interessante-esta-chegando-no-bgp\/","title":{"rendered":"<strong>Uma mudan\u00e7a interessante est\u00e1 chegando no BGP<\/strong><strong><\/strong>"},"content":{"rendered":"\n<p class=\"author\">Por <a href=\"https:\/\/news.lacnic.net\/autor\/alejandro-acosta\">Alejandro Acosta<\/a> &#8211; Coordinador I+D de LACNIC<\/p>\n\n<p>Una fuga de rutas (route leaks) se define como la propagaci\u00f3n de un anuncio m\u00e1s all\u00e1 del alcance previsto <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc7908.html\" target=\"_blank\" rel=\"noreferrer noopener\">(RFC 7908)<\/a>. Pero, \u00bfpor qu\u00e9 ocurren? Existen muchas razones tales como\u00a0 errores (alguien digita mal un n\u00famero), desconocimiento, falta de filtros, ingenier\u00eda social, entre otras.<\/p>\n\n<p>Si bien existen varias formas de prevenirlo y en los \u00faltimos 3 a\u00f1os la cantidad de fugas de rutas ha disminuido\u00a0 (gracias a RPKI, IRR y otros mecanismos), mi idea es explicarles lo que pienso va a ser en el futuro las configuraciones en BGP. Y para eso hablaremos del RFC <a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc9234\/\" target=\"_blank\" rel=\"noreferrer noopener\">9234<\/a>, cuyo t\u00edtulo es <em>Prevenci\u00f3n de fuga de rutas y detecci\u00f3n de roles utilizando mensajes UPDATE y OPEN<\/em>. De este concepto me interesa destacar la \u201cdetecci\u00f3n de roles\u201d, ya que a partir de este\u00a0 RFC, en el futuro vamos a asignar roles en nuestra configuraciones BGP.<\/p>\n\n<p>Para ir comprendiendo a qu\u00e9 queremos llegar recordemos algunos casos t\u00edpicos en un ISP:\u00a0<\/p>\n\n<ul class=\"wp-block-list\"><li>llega un cliente nuevo con el cual hablaremos BGP;<\/li><li>se conecta a un IXP;<\/li><li>el ISP contrata un nuevo upstream provider;<\/li><li>realizaremos un nuevo peering privado.<\/li><\/ul>\n<p>En todos esos casos es necesario tomar decisiones. Hay muchas maneras de configurar BPG: route maps, AS filters, prefix-lists, comunidades, ACLS, entre otros. Incluso puedo estar usando m\u00e1s de una de estas opciones.\u00a0\u00a0<\/p>\n\n<p>Y aqu\u00ed es donde aparece el RFC 9324: este documento define los roles dentro del mensaje Open. Se trata de un acuerdo al que van a llegar los dos enrutadores. Por ejemplo, si yo soy un enrutador y converso con otro, le digo que soy \u201c<em>cliente\u201d<\/em> y \u00e9l en su sesi\u00f3n BGP puede decir <em>\u201cyo soy tu proveedor\u201d<\/em>. En base a eso todas las configuraciones (l\u00e9ase filtros) se har\u00e1n de forma autom\u00e1tica y, en consecuencia, esto deber\u00eda disminuir los route leaks.<\/p>\n\n<p>Estas capacidades entonces se negocian en el mensaje Open de BGP.<\/p>\n\n<p>En el RFC se definen 5 roles:<\/p>\n\n<ul class=\"wp-block-list\"><li>Proveedor: el emisor es un proveedor de tr\u00e1nsito para el vecino;<\/li><li>Cliente: el emisor es un cliente de tr\u00e1nsito del vecino;<\/li><li>RS: el emisor es un servidor de rutas (<em>route server<\/em>), generalmente en un punto de intercambio de tr\u00e1fico (IXP);<\/li><li>Cliente RS: el emisor es cliente de un RS;<\/li><li>Peer: el emisor y el vecino son <em>peers<\/em>.<\/li><\/ul>\n<h2 class=\"wp-block-heading\">\u00bfC\u00f3mo se configuran los roles?<\/h2>\n\n<p>Si por ejemplo tengo un router con una sesi\u00f3n BGP contra alguien y de un lado est\u00e1 el <em>provider<\/em>, del otro lado tiene que estar <em>customer<\/em>, y viceversa. Si tengo un Route Server (RS) de un lado, del otro lado debo tener un cliente route server y viceversa; y peer contra peer (ver tabla)<\/p>\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/news.lacnic.net\/wp-content\/uploads\/2022\/11\/figure1-allow-pairs-of-role-capabilities-nov-2022-1024x820.png\" alt=\"\" class=\"wp-image-19227\" width=\"400\" title=\"\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure1-allow-pairs-of-role-capabilities-nov-2022-1024x820.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure1-allow-pairs-of-role-capabilities-nov-2022-300x240.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure1-allow-pairs-of-role-capabilities-nov-2022-768x615.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure1-allow-pairs-of-role-capabilities-nov-2022.png 1172w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<p>A continuaci\u00f3n, podemos ver un ejemplo<\/p>\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"502\" src=\"https:\/\/news.lacnic.net\/wp-content\/uploads\/2022\/11\/figure2-example-bgp-session-nov-2022-1024x502.png\" alt=\"\" class=\"wp-image-19230\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure2-example-bgp-session-nov-2022-1024x502.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure2-example-bgp-session-nov-2022-300x147.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure2-example-bgp-session-nov-2022-768x377.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure2-example-bgp-session-nov-2022.png 1464w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<h2 class=\"wp-block-heading\"><strong>Capacidades BGP<\/strong><\/h2>\n\n<p>Las capacidades BGP son lo que el enrutador anuncia a sus peers BGP para informarles qu\u00e9 caracter\u00edsticas puede admitir y, si es posible, intentar\u00e1 negociar esa capacidad con sus vecinos. Un router BGP determina las capacidades admitidas por su peer examinando la lista de capacidades presentes en las capacidades transportadas por el mensaje OPEN. Podr\u00edamos compararlo con dos personas pol\u00edglotas que se encuentran: uno habla ingl\u00e9s espa\u00f1ol y portugu\u00e9s, y el otro franc\u00e9s, chino e ingl\u00e9s. El idioma com\u00fan en el que coinciden es el ingl\u00e9s, por lo que se comunicar\u00e1n en ese idioma. Pero no lo har\u00e1n en franc\u00e9s, ya que solo una de ellas lo habla. Eso es lo que b\u00e1sicamente ha permitido que BGP haya crecido tanto y el impacto en nuestras redes ha sido muy peque\u00f1o, porque tiene esos conceptos de compatibilidad hacia atr\u00e1s (backward compatibility) que funcionan perfectamente.<\/p>\n\n<p>Este RFC a\u00f1adi\u00f3 una nueva capacidad<\/p>\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"516\" src=\"https:\/\/news.lacnic.net\/wp-content\/uploads\/2022\/11\/figure3-RFC-has-added-a-new-capability-nov-2022-1024x516.png\" alt=\"\" class=\"wp-image-19233\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure3-RFC-has-added-a-new-capability-nov-2022-1024x516.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure3-RFC-has-added-a-new-capability-nov-2022-300x151.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure3-RFC-has-added-a-new-capability-nov-2022-768x387.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure3-RFC-has-added-a-new-capability-nov-2022-1536x774.png 1536w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure3-RFC-has-added-a-new-capability-nov-2022.png 1894w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<p>\u00bfFunciona este c\u00f3digo? Totalmente; aqu\u00ed un ejemplo:<\/p>\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"616\" src=\"https:\/\/news.lacnic.net\/wp-content\/uploads\/2022\/11\/figure4-code-frr-example-nov-2022-1024x616.png\" alt=\"\" class=\"wp-image-19236\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure4-code-frr-example-nov-2022-1024x616.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure4-code-frr-example-nov-2022-300x180.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure4-code-frr-example-nov-2022-768x462.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure4-code-frr-example-nov-2022-1536x923.png 1536w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/figure4-code-frr-example-nov-2022.png 1750w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<h2 class=\"wp-block-heading\"><strong>Modo estricto<\/strong><\/h2>\n\n<p>En general las capacidades se negocian entre los BGP Speakers y se utilizan exclusivamente las que ambos soportan. Strict Mode es una opci\u00f3n que, en el caso que se configure, ambos enrutadores deber\u00e1n soportar esta capacidad.<\/p>\n\n<p>En conclusi\u00f3n, creo que la manera como el RFC 9234 hace las cosas ser\u00e1 el futuro de la configuraci\u00f3n BGP a nivel global, reemplazando y mejorando notablemente la fuga de rutas y anuncios indebidos en Internet. Facilitar\u00e1 las configuraciones en BGP, y ser\u00e1 un complemento a RPKI e IRR en el tema de fugas de rutas, y en que las tablas de enrutamiento se encuentren m\u00e1s limpias.<\/p>\n\n<p>Puedes ver la presentaci\u00f3n completa en el marco de LACNIC 38 LACNOG 2022<a href=\"https:\/\/youtu.be\/l4ol0kqTmX4?t=18\" target=\"_blank\" rel=\"noreferrer noopener\"> aqu\u00ed<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Por Alejandro Acosta &#8211; Coordinador I+D de LACNIC Una fuga de rutas (route leaks) se define como la propagaci\u00f3n de un anuncio m\u00e1s all\u00e1 del alcance previsto (RFC 7908). Pero, \u00bfpor qu\u00e9 ocurren? Existen muchas razones tales como\u00a0 errores (alguien digita mal un n\u00famero), desconocimiento, falta de filtros, ingenier\u00eda social, entre otras. Si bien existen [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":19242,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[512,1328],"tags":[1284,1293],"archivo":[1346],"taxonomy-authors":[1247],"tipo_autor":[],"class_list":["post-19247","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eventos","category-interconexao","tag-eventos-pt-br","tag-interconexao","archivo-edicoes-anteriores","taxonomy-authors-alejandro-acosta-pt-br"],"acf":{"author":"","related_notes":[19158,19078]},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>LACNIC Blog | Uma mudan\u00e7a interessante est\u00e1 chegando no BGP<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.lacnic.net\/pt-br\/uma-mudanca-interessante-esta-chegando-no-bgp\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LACNIC Blog | Uma mudan\u00e7a interessante est\u00e1 chegando no BGP\" \/>\n<meta property=\"og:description\" content=\"Por Alejandro Acosta &#8211; Coordinador I+D de LACNIC Una fuga de rutas (route leaks) se define como la propagaci\u00f3n de un anuncio m\u00e1s all\u00e1 del alcance previsto (RFC 7908). Pero, \u00bfpor qu\u00e9 ocurren? Existen muchas razones tales como\u00a0 errores (alguien digita mal un n\u00famero), desconocimiento, falta de filtros, ingenier\u00eda social, entre otras. Si bien existen [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.lacnic.net\/pt-br\/uma-mudanca-interessante-esta-chegando-no-bgp\/\" \/>\n<meta property=\"og:site_name\" content=\"LACNIC Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/facebook.com\/lacnic\" \/>\n<meta property=\"article:published_time\" content=\"2022-11-03T13:37:16+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-03-21T13:38:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2022\/11\/thumbnail-cambio-en-bgp-nov-2022.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"680\" \/>\n\t<meta property=\"og:image:height\" content=\"330\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Gianni\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@lacnic\" \/>\n<meta name=\"twitter:site\" 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