{"id":27569,"date":"2024-10-09T16:17:45","date_gmt":"2024-10-09T16:17:45","guid":{"rendered":"https:\/\/blog.lacnic.net\/?p=27569"},"modified":"2024-10-09T18:33:47","modified_gmt":"2024-10-09T18:33:47","slug":"analise-de-bgp-prepends-na-regiao-alc-2024","status":"publish","type":"post","link":"https:\/\/blog.lacnic.net\/pt-br\/analise-de-bgp-prepends-na-regiao-alc-2024\/","title":{"rendered":"An\u00e1lise de BGP prepends na regi\u00e3o ALC 2024"},"content":{"rendered":"\n<p>Por <a href=\"https:\/\/blog.lacnic.net\/pt-br\/autor\/alejandro-acosta\/\">Alejandro Acosta<\/a>, Coordenador de P&amp;D do LACNIC<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Introdu\u00e7\u00e3o<\/strong><\/h2>\n\n\n\n<p>No seguinte relat\u00f3rio gostar\u00edamos de aprofundar em uma quest\u00e3o muito espec\u00edfica das tabelas de BGP da nossa regi\u00e3o, particularmente mostrar uma an\u00e1lise do status dos BGP prepends na regi\u00e3o. O objetivo \u00e9 fazer uma revis\u00e3o detalhada das tabelas BGP tanto no IPv4 quanto no IPv6 e apresentar os resultados.&nbsp;<\/p>\n\n\n\n<p>BGP Prepending \u00e9 uma t\u00e9cnica de longa data e amplamente popular conhecida como &#8220;AS Path Prepending&#8221; que foi concebida como uma estrat\u00e9gia chave para influenciar na sele\u00e7\u00e3o de rotas e a otimiza\u00e7\u00e3o do tr\u00e1fego tanto de entrada quanto de sa\u00edda de um AS. Essa t\u00e9cnica \u00e9 usada por todo tipo de operadores de rede. Ela \u00e9 boa? Deve ser usada sempre? Existe alguma outra possibilidade?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Hist\u00f3ria<\/strong><\/h2>\n\n\n\n<p>Como mencionamos h\u00e1 alguns meses em nossa postagem no blog [1] \u201c<a href=\"https:\/\/blog.lacnic.net\/pt-br\/um-rfc-necessario-sobre-bgp-o-as-path-prepending\/\" target=\"_blank\" rel=\"noreferrer noopener\">Um RFC necess\u00e1rio sobre BGP: o AS Path Prepending<\/a>\u201d,&nbsp;dentro da IETF est\u00e1 avan\u00e7ando o documento chamado \u201cAS Path Prepending\u201d [2] onde o LACNIC teve a oportunidade de participar e ser colaborador do draft. No documento se levantam v\u00e1rias considera\u00e7\u00f5es a serem tomadas no \u00e2mbito da configura\u00e7\u00e3o do BGP Prepending. Com base no que foi dito acima, nos perguntamos: estamos fazendo as coisas bem na ALC? Com este trabalho esperamos esclarecer v\u00e1rias quest\u00f5es.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>O que \u00e9 o AS Path Prepending?<\/strong><\/h2>\n\n\n\n<p>O AS Path Prepending \u00e9 uma t\u00e9cnica que envolve a adi\u00e7\u00e3o repetitiva do identificador de sistema aut\u00f4nomo (ASN) pr\u00f3prio \u00e0 lista de ASs no caminho de uma rota BGP (AS_PATH). O seu objetivo \u00e9 influenciar na sele\u00e7\u00e3o de rotas, tornando certos caminhos menos atrativos para o tr\u00e1fego de entrada\/sa\u00edda. Em outras palavras, \u00e9 adicionar nosso sistema aut\u00f4nomo ao AS_PATH e assim \u201cafastar um prefixo\u201d artificialmente na Internet.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"660\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig1-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x660.png\" alt=\"\" class=\"wp-image-27526\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig1-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x660.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig1-analisis-de-bgp-prepends-en-la-region-lac-2024-300x193.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig1-analisis-de-bgp-prepends-en-la-region-lac-2024-512x330.png 512w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig1-analisis-de-bgp-prepends-en-la-region-lac-2024-768x495.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig1-analisis-de-bgp-prepends-en-la-region-lac-2024-1536x990.png 1536w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig1-analisis-de-bgp-prepends-en-la-region-lac-2024-2048x1319.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>No gr\u00e1fico acima sem <em>prepends<\/em>, o roteador A prefere ir para C via B; no entanto, devido a 3 <em>prepends<\/em> adicionados em B, o roteador A decide alcan\u00e7ar C via D.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>A fonte de dados usados para este estudo<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Extended LACNIC delegated: <a href=\"https:\/\/ftp.lacnic.net\/pub\/stats\/lacnic\/delegated-lacnic-extended-latest\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/ftp.lacnic.net\/pub\/stats\/lacnic\/delegated-lacnic-extended-latest<\/a>&nbsp;<\/li>\n\n\n\n<li>Tabelas BGP IPv4 e IPv6 tiradas de:<\/li>\n<\/ul>\n\n\n\n<p><a href=\"https:\/\/bgp.potaroo.net\/v6\/as2.0\/bgptable.txt\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/bgp.potaroo.net\/v6\/as2.0\/bgptable.txt<\/a> (IPv6)<\/p>\n\n\n\n<p><a href=\"https:\/\/bgp.potaroo.net\/as2.0\/bgptable.txt\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/bgp.potaroo.net\/as2.0\/bgptable.txt<\/a> (IPv4)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Abrang\u00eancia<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Trabalhamos com prefixos de qualquer RIR<\/li>\n\n\n\n<li>Pelo menos um AS da \u00e1rea de cobertura do LACNIC dever\u00e1 aparecer no AS_PATH<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Ferramentas usadas para este estudo<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;&nbsp;Python3<\/li>\n\n\n\n<li>&nbsp;&nbsp;JupyterLabs<\/li>\n\n\n\n<li>&nbsp;&nbsp;Tabelas BGP em formato \u201cshow ip bgp\u201d em Cisco IOS<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Resultados<\/strong><\/h2>\n\n\n\n<p>N\u00famero de prefixos totais na tabela de roteamento<\/p>\n\n\n\n<p>Os dados a seguir mostram quantos prefixos a DFZ (Default Free Zone) tinha no momento da execu\u00e7\u00e3o do seguinte trabalho (tabela de roteamento obtida em 22 de agosto de 2024).<\/p>\n\n\n\n<p>IPv6: 214682 (17,99%)<\/p>\n\n\n\n<p>IPv4: 978614 (82,01%)&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"618\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig2-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x618.png\" alt=\"\" class=\"wp-image-27529\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig2-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x618.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig2-analisis-de-bgp-prepends-en-la-region-lac-2024-300x181.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig2-analisis-de-bgp-prepends-en-la-region-lac-2024-547x330.png 547w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig2-analisis-de-bgp-prepends-en-la-region-lac-2024-768x463.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig2-analisis-de-bgp-prepends-en-la-region-lac-2024-1536x927.png 1536w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig2-analisis-de-bgp-prepends-en-la-region-lac-2024.png 1588w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">N\u00famero de AS_PATH analisados<\/h2>\n\n\n\n<p>Os dados desta se\u00e7\u00e3o correspondem ao total de AS_PATH contabilizados<\/p>\n\n\n\n<p>IPv6: 822573 = 22,10 %<\/p>\n\n\n\n<p>IPv4:&nbsp; 2900978 = 77,90 %<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Prefixos onde pelo menos um AS no AS_PATH \u00e9 do LACNIC<\/h2>\n\n\n\n<p>Dos AS_PATH anteriores, contabilizamos quantos AS da nossa regi\u00e3o podem ser observados<\/p>\n\n\n\n<p>IPv6: 47242 (26,27 %)<\/p>\n\n\n\n<p>IPv4: 132559 (73,73 %)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"607\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig3-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x607.png\" alt=\"\" class=\"wp-image-27532\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig3-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x607.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig3-analisis-de-bgp-prepends-en-la-region-lac-2024-300x178.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig3-analisis-de-bgp-prepends-en-la-region-lac-2024-557x330.png 557w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig3-analisis-de-bgp-prepends-en-la-region-lac-2024-768x455.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig3-analisis-de-bgp-prepends-en-la-region-lac-2024-1536x911.png 1536w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig3-analisis-de-bgp-prepends-en-la-region-lac-2024.png 1582w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><br>N\u00famero de prefixos com prepends na ALC<\/h2>\n\n\n\n<p>Os dados desta se\u00e7\u00e3o mostram o n\u00famero total de prefixos por fam\u00edlia de endere\u00e7os IP onde os ASN s\u00e3o obtidos fazendo prepends da nossa regi\u00e3o.&nbsp;<\/p>\n\n\n\n<p>IPv6: 16822 (32,36%)<\/p>\n\n\n\n<p>IPv4: 35154 (67,64%)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"740\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig4-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x740.png\" alt=\"\" class=\"wp-image-27535\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig4-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x740.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig4-analisis-de-bgp-prepends-en-la-region-lac-2024-300x217.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig4-analisis-de-bgp-prepends-en-la-region-lac-2024-457x330.png 457w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig4-analisis-de-bgp-prepends-en-la-region-lac-2024-768x555.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig4-analisis-de-bgp-prepends-en-la-region-lac-2024.png 1456w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">N\u00famero de AS de origem fazendo prepends. Isto seria relativo ao AS_PATH.<\/h2>\n\n\n\n<p>As informa\u00e7\u00f5es a seguir correspondem ao n\u00famero de sistemas aut\u00f4nomos de origem que fazem BGP Prepending. Para obter estes valores, o AS_Origin n\u00e3o corresponde necessariamente ao LACNIC; se houver algum ASN do LACNIC no AS_PATH, ele \u00e9 contabilizado.<\/p>\n\n\n\n<p>IPv6: 34832 (48,58 %)<\/p>\n\n\n\n<p>IPv4: 36863&nbsp;(51,42%).&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"799\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig5-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x799.png\" alt=\"\" class=\"wp-image-27538\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig5-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x799.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig5-analisis-de-bgp-prepends-en-la-region-lac-2024-300x234.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig5-analisis-de-bgp-prepends-en-la-region-lac-2024-423x330.png 423w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig5-analisis-de-bgp-prepends-en-la-region-lac-2024-768x599.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig5-analisis-de-bgp-prepends-en-la-region-lac-2024.png 1456w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"602\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig6-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x602.png\" alt=\"\" class=\"wp-image-27541\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig6-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x602.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig6-analisis-de-bgp-prepends-en-la-region-lac-2024-300x176.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig6-analisis-de-bgp-prepends-en-la-region-lac-2024-561x330.png 561w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig6-analisis-de-bgp-prepends-en-la-region-lac-2024-768x452.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig6-analisis-de-bgp-prepends-en-la-region-lac-2024.png 1534w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">AS \u201cSingle Homed\u201d fazendo prepends<strong>.<\/strong><\/h2>\n\n\n\n<p>Lembrando que n\u00e3o \u00e9 uma boa pr\u00e1tica realizar prepends naqueles ASN conhecidos como \u201cSingle Home\u201d (se\u00e7\u00e3o 5 do rascunho IETF), foram alcan\u00e7ados os seguintes resultados para ASN da \u00e1rea de abrang\u00eancia do LACNIC.<\/p>\n\n\n\n<p>IPv6:&nbsp; 296 (28,21%)<\/p>\n\n\n\n<p>IPv4:&nbsp; 753 (71,79%)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"610\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig7-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x610.png\" alt=\"\" class=\"wp-image-27544\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig7-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x610.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig7-analisis-de-bgp-prepends-en-la-region-lac-2024-300x179.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig7-analisis-de-bgp-prepends-en-la-region-lac-2024-554x330.png 554w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig7-analisis-de-bgp-prepends-en-la-region-lac-2024-768x457.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig7-analisis-de-bgp-prepends-en-la-region-lac-2024-1536x914.png 1536w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig7-analisis-de-bgp-prepends-en-la-region-lac-2024.png 1542w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Mais de 5 prepends no AS_PATH<\/h2>\n\n\n\n<p>Seguindo a boa pr\u00e1tica de n\u00e3o usar mais de 5 prepends (se\u00e7\u00e3o 5 do rascunho IETF) ao configurar o BGP Prepending, contabilizamos o n\u00famero de repeti\u00e7\u00f5es dos prepends. N\u00f3s nos focamos principalmente naqueles que ultrapassam este valor, uma vez que mais de 80% dos destinos est\u00e3o dentro deste comprimento de AS_PATH.<\/p>\n\n\n\n<p>IPv6: 4177 (51,69%)<\/p>\n\n\n\n<p>IPv4: 3903 (48,31%)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"552\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig8-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x552.png\" alt=\"\" class=\"wp-image-27547\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig8-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x552.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig8-analisis-de-bgp-prepends-en-la-region-lac-2024-300x162.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig8-analisis-de-bgp-prepends-en-la-region-lac-2024-613x330.png 613w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig8-analisis-de-bgp-prepends-en-la-region-lac-2024-768x414.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig8-analisis-de-bgp-prepends-en-la-region-lac-2024.png 1448w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Prefixo com mais prepends<\/h2>\n\n\n\n<p>As informa\u00e7\u00f5es a seguir correspondem ao comprimento m\u00e1ximo de prepends alcan\u00e7ado em IPv6 e IPv4.<\/p>\n\n\n\n<p>IPv6: 27 prepends (agosto 2024)<\/p>\n\n\n\n<p>IPv4: 61 prepends (agosto 2024)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"606\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig9-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x606.png\" alt=\"\" class=\"wp-image-27550\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig9-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x606.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig9-analisis-de-bgp-prepends-en-la-region-lac-2024-300x178.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig9-analisis-de-bgp-prepends-en-la-region-lac-2024-558x330.png 558w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig9-analisis-de-bgp-prepends-en-la-region-lac-2024-768x455.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig9-analisis-de-bgp-prepends-en-la-region-lac-2024-1536x909.png 1536w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig9-analisis-de-bgp-prepends-en-la-region-lac-2024.png 1730w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Onde ocorre o prepend?<\/h2>\n\n\n\n<p>Os gr\u00e1ficos abaixo mostram onde, em geral, os prepends s\u00e3o obtidos dentro do AS_PATH.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"569\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig10-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x569.png\" alt=\"\" class=\"wp-image-27553\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig10-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x569.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig10-analisis-de-bgp-prepends-en-la-region-lac-2024-300x167.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig10-analisis-de-bgp-prepends-en-la-region-lac-2024-593x330.png 593w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig10-analisis-de-bgp-prepends-en-la-region-lac-2024-768x427.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig10-analisis-de-bgp-prepends-en-la-region-lac-2024.png 1248w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"602\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig11-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x602.png\" alt=\"\" class=\"wp-image-27556\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig11-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x602.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig11-analisis-de-bgp-prepends-en-la-region-lac-2024-300x176.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig11-analisis-de-bgp-prepends-en-la-region-lac-2024-561x330.png 561w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig11-analisis-de-bgp-prepends-en-la-region-lac-2024-768x452.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig11-analisis-de-bgp-prepends-en-la-region-lac-2024.png 1340w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Prepends 16 bits vs. 32 bits&nbsp;<\/h2>\n\n\n\n<p>Os presentes dados correspondem a uma contagem simples de ASN repetidos nos AS PATH de acordo com o seu comprimento de bits. ASN maiores que 65.535 correspondem a ASN de 32 bits.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><\/td><td><strong>16bits<\/strong><\/td><td><strong>32bits<\/strong><\/td><\/tr><tr><td>IPv6<\/td><td>153603<\/td><td>28445<\/td><\/tr><tr><td>IPv4<\/td><td>115824<\/td><td>68970<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"666\" src=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig12-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x666.png\" alt=\"\" class=\"wp-image-27559\" srcset=\"https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig12-analisis-de-bgp-prepends-en-la-region-lac-2024-1024x666.png 1024w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig12-analisis-de-bgp-prepends-en-la-region-lac-2024-300x195.png 300w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig12-analisis-de-bgp-prepends-en-la-region-lac-2024-507x330.png 507w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig12-analisis-de-bgp-prepends-en-la-region-lac-2024-768x500.png 768w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig12-analisis-de-bgp-prepends-en-la-region-lac-2024-1536x999.png 1536w, https:\/\/blog.lacnic.net\/wp-content\/uploads\/2024\/10\/fig12-analisis-de-bgp-prepends-en-la-region-lac-2024.png 1642w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">TOP 10 ranking de repeti\u00e7\u00f5es:<\/h2>\n\n\n\n<p>Para obter esses dados, cada pa\u00eds do ASN foi contabilizado na tabela de BGP desde que houvesse prepends no AS_PATH.&nbsp;<\/p>\n\n\n\n<p>Para esclarecer, segue o algoritmo usado:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>FOR AS_PATH in AS_PATHs_CON_PREPENDS:\n\nFOR ASN in AS_PATH:\n\nccASN = pais(ASN)\n\nDict_ASNs_CC&#91;ccASN] = Dict_ASNs_CC&#91;ccASN] + 1<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>IPv6<\/strong><\/td><td><strong>&nbsp;<\/strong><\/td><td><strong>&nbsp;<\/strong><\/td><td><strong>IPv4<\/strong><\/td><td><strong>&nbsp;<\/strong><\/td><\/tr><tr><td><strong>CC<\/strong><\/td><td><strong>Repeti\u00e7\u00f5es<\/strong><\/td><td><strong>&nbsp;<\/strong><\/td><td><strong>CC<\/strong><\/td><td><strong>Repeti\u00e7\u00f5es<\/strong><\/td><\/tr><tr><td>&nbsp;MX<\/td><td>106710<\/td><td>&nbsp;<\/td><td>&nbsp;BR<\/td><td>76110<\/td><\/tr><tr><td>&nbsp;BR<\/td><td>35460<\/td><td>&nbsp;<\/td><td>&nbsp;AR<\/td><td>29804<\/td><\/tr><tr><td>&nbsp;CO<\/td><td>30549<\/td><td>&nbsp;<\/td><td>&nbsp;CO<\/td><td>26892<\/td><\/tr><tr><td>&nbsp;AR<\/td><td>3074<\/td><td>&nbsp;<\/td><td>&nbsp;MX<\/td><td>10239<\/td><\/tr><tr><td>&nbsp;PA<\/td><td>1876<\/td><td>&nbsp;<\/td><td>&nbsp;CR<\/td><td>5811<\/td><\/tr><tr><td>&nbsp;EC<\/td><td>943<\/td><td>&nbsp;<\/td><td>&nbsp;PA<\/td><td>5172<\/td><\/tr><tr><td>&nbsp;PE<\/td><td>859<\/td><td>&nbsp;<\/td><td>&nbsp;CL<\/td><td>4697<\/td><\/tr><tr><td>&nbsp;DO<\/td><td>408<\/td><td>&nbsp;<\/td><td>&nbsp;EC<\/td><td>4038<\/td><\/tr><tr><td>&nbsp;CL<\/td><td>281<\/td><td>&nbsp;<\/td><td>&nbsp;VE<\/td><td>3605<\/td><\/tr><tr><td>&nbsp;NI<\/td><td>272<\/td><td>&nbsp;<\/td><td>&nbsp;PE<\/td><td>2956<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">TOP 5 pa\u00edses que fazem BGP Prepending na nossa regi\u00e3o (ratio)<\/h2>\n\n\n\n<p>Para calcular a rela\u00e7\u00e3o dos pa\u00edses que mais fazem prepends, foi contabilizada a ocorr\u00eancia dos pa\u00edses em cada AS_PATH e posteriormente usou-se a mesma metodologia apenas naqueles onde existiam prepends. Finalmente, o contador global \u00e9 dividido entre aqueles com prepends.&nbsp;<\/p>\n\n\n\n<p>Por exemplo, para Cuba foram obtidas 12 entradas na tabela BGP (IPv6), das quais 6 t\u00eam prepends, neste caso a propor\u00e7\u00e3o \u00e9 2 (12\/6).<\/p>\n\n\n\n<p>Outro pa\u00eds com um n\u00famero inteiro foi Cura\u00e7ao, onde foram obtidas 108 entradas (IPv6) na tabela BGP das quais 9 possuem prepends, obtendo uma propor\u00e7\u00e3o de 12 (108\/9)<\/p>\n\n\n\n<p>O que foi dito acima significa que para cada 2 AS_PATH na tabela BGP global nos ASN de Cuba, 1 tem prepends, e para cada 12 AS_PATH na tabela BGP global nos ASN de Cura\u00e7ao, 1 tem prepends.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">O TOP 5 de pa\u00edses com menor propor\u00e7\u00e3o (fazem mais prepends):<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>IPv6<\/strong><\/td><td><\/td><td><\/td><td><strong>IPv4<\/strong><\/td><td><\/td><\/tr><tr><td><strong>CC<\/strong><\/td><td>Ratio<\/td><td>&nbsp;<\/td><td><strong>CC<\/strong><\/td><td>Ratio<\/td><\/tr><tr><td>MX<\/td><td>1,75<\/td><td>&nbsp;<\/td><td>BZ<\/td><td>2,6<\/td><\/tr><tr><td>CU<\/td><td>2<\/td><td>&nbsp;<\/td><td>AW<\/td><td>3,04<\/td><\/tr><tr><td>BO<\/td><td>3,4<\/td><td>&nbsp;<\/td><td>PY<\/td><td>3,07<\/td><\/tr><tr><td>BZ<\/td><td>3,2<\/td><td>&nbsp;<\/td><td>AR<\/td><td>3,3<\/td><\/tr><tr><td>SV<\/td><td>6<\/td><td>&nbsp;<\/td><td>PA<\/td><td>3,53<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">O TOP 5 de pa\u00edses com maior propor\u00e7\u00e3o (fazem menos prepends):<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>IPv6<\/strong><\/td><td><\/td><td><\/td><td><strong>IPv4<\/strong><\/td><td><\/td><\/tr><tr><td><strong>CC<\/strong><\/td><td>Ratio<\/td><td>&nbsp;<\/td><td><strong>CC<\/strong><\/td><td>Ratio<\/td><\/tr><tr><td>SR<\/td><td>60<\/td><td>&nbsp;<\/td><td>CW<\/td><td>45,11<\/td><\/tr><tr><td>GY<\/td><td>53<\/td><td>&nbsp;<\/td><td>CU&nbsp;<\/td><td>37,5<\/td><\/tr><tr><td>CR<\/td><td>36,61<\/td><td>&nbsp;<\/td><td>SV<\/td><td>14,96<\/td><\/tr><tr><td>GT<\/td><td>28,7<\/td><td>&nbsp;<\/td><td>UY<\/td><td>11,98<\/td><\/tr><tr><td>CL<\/td><td>26,15<\/td><td>&nbsp;<\/td><td>MX<\/td><td>11,13<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclus\u00f5es<\/strong><\/h2>\n\n\n\n<p>O <strong>BGP Prepending<\/strong> \u00e9 uma t\u00e9cnica comum na nossa regi\u00e3o, mas \u00e9 crucial disseminar boas pr\u00e1ticas de implementa\u00e7\u00e3o e explorar outras alternativas de engenharia de tr\u00e1fego. Nossa an\u00e1lise recente mostra que 296 organiza\u00e7\u00f5es <strong>single-homed<\/strong> no IPv6 e 753 no IPv4 est\u00e3o usando prepending, um n\u00famero que gera preocupa\u00e7\u00e3o. Al\u00e9m disso, \u00e9 alarmante que muitas operadoras fazem mais de cinco prepends, chegando a casos extremos de at\u00e9 <strong>27 no IPv6<\/strong> e <strong>61 no IPv4<\/strong>, o que n\u00e3o s\u00f3 n\u00e3o tem impacto positivo nas tabelas de roteamento, mas tamb\u00e9m afeta negativamente a mem\u00f3ria, CPU e rede nos BGP Speakers.<\/p>\n\n\n\n<p>Um aspecto not\u00e1vel \u00e9 o <strong>desequil\u00edbrio<\/strong> no uso de prepends entre o IPv4 e o IPv6, o que nos leva a nos perguntar: o que est\u00e1 causando essa diferen\u00e7a? Esta an\u00e1lise busca conscientizar sobre a correta implementa\u00e7\u00e3o do BGP Prepending.<\/p>\n\n\n\n<p><strong>Por favor, reveja a publica\u00e7\u00e3o dos seus prefixos e garanta uma implementa\u00e7\u00e3o respons\u00e1vel! <\/strong>Voc\u00ea tem algum coment\u00e1rio? Gostar\u00edamos de ouvir voc\u00ea!<\/p>\n\n\n\n<p>Se quiser ver a apresenta\u00e7\u00e3o realizada sobre este tema no LACNIC 42- LACNOG 2024 acesse<br><a href=\"https:\/\/www.youtube.com\/watch?v=jzrqgzxsOJw\" target=\"_blank\" rel=\"noreferrer noopener\">aqui<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"An\u00e1lise de Prepends na Regi\u00e3o LAC 2024\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/jzrqgzxsOJw?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Refer\u00eancias:<\/strong><\/h2>\n\n\n\n<p>[1] <a href=\"https:\/\/blog.lacnic.net\/un-necesario-rfc-sobre-bgp-as-path-prepending\/\">https:\/\/blog.lacnic.net\/un-necesario-rfc-sobre-bgp-as-path-prepending\/<\/a><\/p>\n\n\n\n<p>[2] <a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/draft-ietf-grow-as-path-prepending-12\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/datatracker.ietf.org\/doc\/html\/draft-ietf-grow-as-path-prepending-12<\/a>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Por Alejandro Acosta, Coordenador de P&amp;D do LACNIC Introdu\u00e7\u00e3o No seguinte relat\u00f3rio gostar\u00edamos de aprofundar em uma quest\u00e3o muito espec\u00edfica das tabelas de BGP da nossa regi\u00e3o, particularmente mostrar uma an\u00e1lise do status dos BGP prepends na regi\u00e3o. O objetivo \u00e9 fazer uma revis\u00e3o detalhada das tabelas BGP tanto no IPv4 quanto no IPv6 e [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":27592,"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","enabled":false},"version":2}},"categories":[1328],"tags":[1284,1293],"archivo":[1346,1452],"taxonomy-authors":[1247],"tipo_autor":[],"class_list":["post-27569","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-interconexao","tag-eventos-pt-br","tag-interconexao","archivo-edicoes-anteriores","archivo-destaques-2023","taxonomy-authors-alejandro-acosta-pt-br"],"acf":{"author":"Alejandro Acosta","related_notes":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>LACNIC Blog | An\u00e1lise de BGP prepends na regi\u00e3o ALC 2024<\/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\/analise-de-bgp-prepends-na-regiao-alc-2024\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LACNIC Blog | An\u00e1lise de BGP prepends na regi\u00e3o ALC 2024\" \/>\n<meta property=\"og:description\" content=\"Por Alejandro Acosta, Coordenador de P&amp;D do LACNIC Introdu\u00e7\u00e3o No seguinte relat\u00f3rio gostar\u00edamos de aprofundar em uma quest\u00e3o muito espec\u00edfica das tabelas de BGP da nossa regi\u00e3o, particularmente mostrar uma an\u00e1lise do status dos BGP prepends na regi\u00e3o. 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