{"id":11022,"date":"2024-09-17T14:56:48","date_gmt":"2024-09-17T11:56:48","guid":{"rendered":"https:\/\/vasexperts.com\/?p=11022"},"modified":"2025-08-13T14:06:53","modified_gmt":"2025-08-13T11:06:53","slug":"ssg-as-vnf-for-telco-cloud","status":"publish","type":"post","link":"https:\/\/vasexperts.com\/fr\/blog\/functionality\/ssg-as-vnf-for-telco-cloud\/","title":{"rendered":"SSG comme VNF pour Telco Cloud"},"content":{"rendered":"<h2>Avantages de Telco Cloud<\/h2>\r\n<ul>\r\n \t<li>Grande largeur de bande du r\u00e9seau;<\/li>\r\n \t<li>Utilisation efficace des ressources;<\/li>\r\n \t<li>Tol\u00e9rance accrue aux pannes;<\/li>\r\n \t<li>Flexibilit\u00e9 et \u00e9volutivit\u00e9 de l\u2019infrastructure de l\u2019op\u00e9rateur;<\/li>\r\n \t<li>R\u00e9activit\u00e9 aux nouvelles technologies\r\nPr\u00e9paration aux nouvelles technologies et charges de travail.<\/li>\r\n<\/ul>\r\n<h2>Architecture cloud de Telco utilisant vStack comme exemple<\/h2>\r\n<a rel=\"nofollow\" href=\"https:\/\/vstack.com\/vstack-telco-cloud\/\">vStack Telco Cloud<\/a> est une solution industrielle du fournisseur vStack, con\u00e7ue pour construire des centres de donn\u00e9es modernes d\u2019op\u00e9rateurs de t\u00e9l\u00e9communications, avec des exigences accrues en mati\u00e8re de bande passante, permettant de placer la plupart des fonctions de r\u00e9seau (CG-NAT, BRAS, DPI) dans l\u2019infrastructure virtuelle.\r\n\r\n<noscript><img loading=\"lazy\" decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/09\/vstack-1024x466.png\" alt=\"Architecture cloud de Telco utilisant vStack\" width=\"1024\" height=\"466\" class=\"alignnone size-large wp-image-11023\" srcset=\"\/wp-content\/uploads\/2024\/09\/vstack-1024x466.png 1024w, \/wp-content\/uploads\/2024\/09\/vstack-300x137.png 300w, \/wp-content\/uploads\/2024\/09\/vstack-768x349.png 768w, \/wp-content\/uploads\/2024\/09\/vstack-1536x699.png 1536w, \/wp-content\/uploads\/2024\/09\/vstack.png 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><\/noscript><img loading=\"lazy\" decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/09\/vstack-1024x466.png\" alt=\"Architecture cloud de Telco utilisant vStack\" width=\"1024\" height=\"466\" class=\"alignnone size-large wp-image-11023 lazyload\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-src=\"\/wp-content\/uploads\/2024\/09\/vstack-1024x466.png\" data-srcset=\"\/wp-content\/uploads\/2024\/09\/vstack-1024x466.png 1024w, \/wp-content\/uploads\/2024\/09\/vstack-300x137.png 300w, \/wp-content\/uploads\/2024\/09\/vstack-768x349.png 768w, \/wp-content\/uploads\/2024\/09\/vstack-1536x699.png 1536w, \/wp-content\/uploads\/2024\/09\/vstack.png 1600w\">\r\n<h2>Sc\u00e9nario de mise en \u0153uvre de VNF SSG<\/h2>\r\nL\u2019architecture SSG suppose une parall\u00e9lisation de la charge entre des c\u0153urs de processeurs physiques distincts. Exactement des c\u0153urs physiques, parce que le traitement du trafic exige des performances \u00e9lev\u00e9es et une latence constamment faible. En cas d\u2019utilisation de c\u0153urs virtuels, il est impossible de remplir ces conditions.\r\n\r\nCi-dessous, nous allons \u00e9tudier un exemple d\u2019organisation de cluster SSG CG-NAT VNF utilisant l\u2019\u00e9quilibreur SSG L3B dans le Telco Cloud.\r\n\r\nAllouons les machines virtuelles suivantes :\r\n<ol>\r\n \t<li>SSG CG-NAT : 12 c\u0153urs physiques. Chaque VM se voit attribuer 2x25G SR-IOV virtual ports in on-stick mode. La bande passante est donc de 25 Gbps (entr\u00e9e+sortie), redondance comprise. La carte \u00e0 partir de laquelle les ports sont attribu\u00e9s doit \u00eatre install\u00e9e dans l\u2019emplacement PCIe de l\u2019unit\u00e9 centrale o\u00f9 les c\u0153urs physiques pour la VM sont attribu\u00e9s.<\/li>\r\n \t<li>SSG L3B : 12 c\u0153urs physiques. Chaque VM se voit attribuer 2x25G SR-IOV ports virtuels en mode on-stick. Ainsi, la bande passante est de 25Gbps (entr\u00e9e+sortie), redondance comprise. La carte \u00e0 partir de laquelle les ports sont attribu\u00e9s doit \u00eatre install\u00e9e dans l\u2019emplacement PCIe du CPU o\u00f9 les c\u0153urs physiques pour la VM sont attribu\u00e9s.<\/li>\r\n<\/ol>\r\nLe cluster est extensible jusqu\u2019\u00e0 60 VM SSG CG-NAT et jusqu\u2019\u00e0 10 VM SSG L3B, avec un d\u00e9bit maximum de 1,5Tbps.\r\n<h3>Diagramme de flux de trafic avec \u00e9quilibrage bas\u00e9 sur SSG L3B<\/h3>\r\n<a href=\"\/wp-content\/uploads\/2024\/09\/virtual-lb-freedom-telecom-1-scaled.jpg\" data-fancybox=\"\"><noscript><img decoding=\"async\" class=\"size-full wp-image-\" title=\"\" src=\"\/wp-content\/uploads\/2024\/09\/virtual-lb-freedom-telecom-1-scaled.jpg\" alt=\"Diagramme de flux de trafic\" width=\"\"><\/noscript><img decoding=\"async\" class=\"size-full wp-image- lazyload\" title=\"\" src=\"\/wp-content\/uploads\/2024\/09\/virtual-lb-freedom-telecom-1-scaled.jpg\" alt=\"Diagramme de flux de trafic\" width=\"\" data-src=\"\/wp-content\/uploads\/2024\/09\/virtual-lb-freedom-telecom-1-scaled.jpg\"><\/a>\r\n<h3>Flux de trafic dans le sens abonn\u00e9 -> WAN (en amont)<\/h3>\r\n<ol>\r\n \t<li>Chaque SSG L3B annonce une passerelle par d\u00e9faut vers BR-inside (BR-inside-1, BR-inside-2) via BGP.<\/li>\r\n \t<li>Chaque SSG CG-NAT annonce une passerelle par d\u00e9faut vers le c\u00f4t\u00e9 de chaque SSG L3B via BGP.<\/li>\r\n \t<li>Chaque BR-outside annonce une passerelle par d\u00e9faut du c\u00f4t\u00e9 du SSG CG-NAT VNF cluster.<\/li>\r\n \t<li>Le BR-inside fusionne le cluster VM de SSG L3B en un seul groupe ECMP. Effectue l\u2019\u00e9quilibrage entre les prochains sauts du m\u00eame groupe ECMP au niveau 5 du flux de tuple.<\/li>\r\n \t<li>Le SSG L3B, lorsqu\u2019il re\u00e7oit le trafic du BR-inside, distribue automatiquement tout le trafic sortant des clients au SSG CG-NAT du cluster VNF en fonction de l\u2019adresse IP source.<\/li>\r\n \t<li>Le SSG CG-NAT effectue la traduction d\u2019adresse, le routage (changement des adresses MAC) et envoie le paquet au BR-outside-1 ou au BR-outside-2 en fonction des routes BGP re\u00e7ues. Le cluster SSG CG-NAT VNF combine les routeurs de p\u00e9riph\u00e9rie en un seul groupe ECMP. L\u2019\u00e9quilibrage Round Robin est effectu\u00e9 au niveau du flux sur toutes les routes Multipath afin que les paquets appartenant au m\u00eame flux de 5 tuple soient achemin\u00e9s vers le m\u00eame BR.<\/li>\r\n<\/ol>\r\n<h3>Flux de trafic dans la direction WAN -> abonn\u00e9 (en aval)<\/h3>\r\n<ol>\r\n \t<li>Le BR-inside annonce au cluster L3B du SSG via BGP les sous-r\u00e9seaux des abonn\u00e9s qu\u2019il dessert (\u00ab Users \u00bb dans le diagramme).<\/li>\r\n \t<li>Chaque n\u0153ud CG-NAT du SSG annonce au BR-outside (BR-outside -1, BR-outside -2) le pool NAT public desservi via BGP.<\/li>\r\n \t<li>Le BR-outside achemine le trafic vers le SSG CG-NAT annon\u00e7ant le pool en fonction des routes re\u00e7ues. Le SSG CG-NAT effectue une traduction d\u2019adresse inverse, effectue le routage (change les adresses MAC en celles du BR-inside correspondant) sur la base des routes re\u00e7ues de chaque BR-inside via BGP.<\/li>\r\n \t<li>Le SSG CG-NAT, lorsqu\u2019il re\u00e7oit les m\u00eames routes de BR-inside, effectue un \u00e9quilibrage round robin au niveau du flux sur toutes les routes Multipath afin que les paquets appartenant au m\u00eame flux 5 tuple soient achemin\u00e9s vers le m\u00eame BR-inside. Comme aucun \u00e9quilibrage n\u2019est requis pour le trafic DOWN Stream, le trafic DOWN Stream contourne le cluster L3B.<\/li>\r\n<\/ol>\r\n<h3>Tol\u00e9rance aux pannes<\/h3>\r\nSi une VM SSG L3B tombe en panne, la session BGP en cours entre le L3B sp\u00e9cifique et le BR-inside est interrompue. L\u2019ECMP permettra de redistribuer uniform\u00e9ment le trafic entre les VM SSG L3B restantes.\r\n\r\nEn cas de d\u00e9faillance du VM SSG CG-NAT, la session BGP en cours est interrompue et le trafic de l\u2019IP source, qui allait vers le CG-NAT d\u00e9faillant, sera redistribu\u00e9 de mani\u00e8re \u00e9gale vers les CG-NAT restants, sans modifier l\u2019\u00e9quilibrage sur les LB des autres abonn\u00e9s. Pour ce faire, on utilise l\u2019algorithme de variation de hachage r\u00e9silient, en ne tenant compte que de l\u2019IP source.\r\n\r\n   <strong>   L\u2019ajout d\u2019un nouveau VM SSG CG-NAT au pool est r\u00e9alis\u00e9 :    <\/strong>  \r\n<ol>\r\n \t<li>Au niveau de l\u2019infrastructure virtuelle vStack (importation\/cr\u00e9ation\/administration de VM) : manuellement ou en utilisant les images cloud appropri\u00e9es prises en charge par vStack Telco Cloud.<\/li>\r\n \t<li>Au niveau du syst\u00e8me d\u2019exploitation de la VM (installation\/configuration des composants) : manuellement ou \u00e0 l\u2019aide de scripts appropri\u00e9s (bash\/python ou autre syst\u00e8me d\u2019exploitation pris en charge). Les outils de gestion de la configuration sont \u00e9galement pris en charge.<\/li>\r\n<\/ol>\r\nUne fois qu\u2019une session BGP d\u2019un nouveau SSG CG-NAT est \u00e9tablie avec chaque SSG L3B, le nouveau SSG CG-NAT est ajout\u00e9 au groupe ECMP. Le SSG L3B distribue le trafic avec le nouveau SSG CG-NAT en tenant compte de l\u2019algorithme de variation de hachage r\u00e9silient.\r\n\r\n[product id=\u00a0\u00bb 19\u2033 type=\u00a0\u00bbdark\u00a0\u00bb]","protected":false},"excerpt":{"rendered":"<p>Les op\u00e9rateurs de t\u00e9l\u00e9communications passent des r\u00e9seaux physiques \u00e0 des solutions bas\u00e9es sur l&rsquo;informatique en nuage afin d&rsquo;accro\u00eetre la flexibilit\u00e9, la r\u00e9silience et de r\u00e9duire les co\u00fbts d&rsquo;exploitation. Cette approche est fondamentalement diff\u00e9rente du mod\u00e8le traditionnel bas\u00e9 sur du mat\u00e9riel sp\u00e9cialis\u00e9. Les op\u00e9rateurs doivent d\u00e9sormais d\u00e9velopper et g\u00e9rer des services dans des centres de donn\u00e9es qui int\u00e8grent des \u00e9cosyst\u00e8mes physiques et virtuels, tout en garantissant l&rsquo;interop\u00e9rabilit\u00e9 avec des fournisseurs concurrents.<\/p>\n","protected":false},"author":24,"featured_media":11025,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[55],"tags":[],"class_list":["post-11022","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-functionality"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>(English) VASExperts<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<script type=\"application\/ld+json\" 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