{"id":3853,"date":"2025-06-23T15:05:12","date_gmt":"2025-06-23T07:05:12","guid":{"rendered":"https:\/\/www.key-iot.com\/?p=3853"},"modified":"2025-06-23T15:05:12","modified_gmt":"2025-06-23T07:05:12","slug":"5-minutes-to-understand-how-a-router-works-and-its-main-components","status":"publish","type":"post","link":"https:\/\/www.key-iot.com\/de\/blog\/5-minutes-to-understand-how-a-router-works-and-its-main-components\/","title":{"rendered":"5 Minuten zum Verst\u00e4ndnis der Funktionsweise eines Routers und seiner Hauptkomponenten"},"content":{"rendered":"
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\"55d13c3c5faeb0e057dbdccf3ec0e62b\"<\/h3>\n<\/div>\n
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01.\u00a0Was ist ein Router?<\/strong><\/h2>\n<\/div>\n
Vereinfacht ausgedr\u00fcckt ist ein Router ein Ger\u00e4t, das die Verbindung von Netzen mit Routing- und Weiterleitungsfunktionen erm\u00f6glicht. Au\u00dferdem kann er die Geschwindigkeit von Subnetzen anpassen, Subnetze isolieren und Zugangsregeln festlegen.<\/span><\/div>\n
Definition<\/strong>: A Router<\/strong><\/a> ist ein Ger\u00e4t, das die Zusammenschaltung von Netzen erm\u00f6glicht und auf der\u00a0dritte Schicht des OSI-Modells<\/strong>-die\u00a0Netzwerkschicht<\/strong>. Sie bietet zwei wichtige Mechanismen:\u00a0Weiterleitung<\/strong>\u00a0und\u00a0Weiterleitung<\/strong>.<\/span><\/p>\n
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  • Weiterleitung<\/strong>: Bestimmt den Weg, den ein Datenpaket von der Quelle zum Ziel nimmt (den optimalen \u00dcbertragungsweg zwischen den Hosts). Dieser Vorgang wird als Routing bezeichnet.<\/li>\n
  • Weiterleitung<\/strong>: \u00dcbertr\u00e4gt Datenpakete vom Eingangsport des Routers zum entsprechenden Ausgangsport (dies geschieht intern im Router).<\/li>\n<\/ul>\n<\/div>\n
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    02.\u00a0Typische Routerstruktur<\/strong><\/h2>\n<\/div>\n
    (Hinweis: Das im Originaltext erw\u00e4hnte Diagramm ist hier nicht enthalten).<\/em><\/span><\/div>\n
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    03.\u00a0Wie ein Router funktioniert<\/strong><\/h2>\n<\/div>\n
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    1. Leitweglenkung (Software, Steuerschicht)<\/strong>:\n
        \n
      • Das Routing-Protokoll w\u00e4hlt und erzeugt Routing-Eintr\u00e4ge, die in die Routing-Tabelle aufgenommen werden.<\/li>\n
      • Die Routing-Tabelle wird in der Forwarding Engine im Speicher abgebildet und im Cache-Bereich des ASIC-Chips abgelegt.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div>\n
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          \n
        1. Weiterleitung von Paketen (Hardware, Datenschicht)<\/strong>:\n
            \n
          • Nachdem die Daten\u00fcbertragungsschicht den Frame-Header und den Trailer entfernt hat, wird das Paket an die Netzwerkschicht gesendet.<\/li>\n
          • Die Netzwerkschicht verwendet die Schl\u00fcsselfelder des IP-Headers, um die Weiterleitungstabelle zu durchsuchen und die Ausgangsschnittstelle zu bestimmen.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div>\n
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            \"af96f4471a7fc3aee8588a22f2810203\"<\/h2>\n

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            04.\u00a0Hardware-Routing-Weiterleitungstabelle<\/strong><\/h2>\n<\/div>\n
            Die Hardware-Routing-Weiterleitungstabelle kann unabh\u00e4ngig von ihrer Gr\u00f6\u00dfe innerhalb eines einzigen Taktzyklus durchsucht werden.<\/span><\/div>\n
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              \n
            • CAM-Tabelle<\/strong>:\n
                \n
              • F\u00fchrt einen bin\u00e4ren Abgleich durch (1 oder 0). Sie stimmt entweder vollst\u00e4ndig \u00fcberein oder \u00fcberhaupt nicht.<\/li>\n
              • Wird f\u00fcr die Suche nach MAC-Adressen verwendet.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div>\n
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                  \n
                • TCAM-Weiterleitungstabelle<\/strong>:\n
                    \n
                  • F\u00fchrt einen tern\u00e4ren Abgleich durch (0, 1 oder \"ist mir egal\").<\/li>\n
                  • Sortiert von pr\u00e4zisen zu ungenauen \u00dcbereinstimmungen.<\/li>\n
                  • Wird f\u00fcr Routing-Tabellen-Richtlinien, Routing-Matches, Firewalls und Routing-Regelabgleiche verwendet.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div>\n
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                    05.\u00a0NP (Netzwerkprozessor) Chip<\/strong><\/h2>\n<\/div>\n
                    Der NP-Chip ist programmierbar und kann die Hardware-Verarbeitung f\u00fcr mehrere Dienste gleichzeitig beschleunigen. Vor seiner Einf\u00fchrung waren Router spezialisierte Ger\u00e4te. Mit dem NP-Chip,\u00a0All-Service-Router<\/strong>\u00a0m\u00f6glich wurde.<\/span><\/div>\n
                    Vorteile von NP gegen\u00fcber ASIC<\/strong>:<\/span><\/p>\n
                      \n
                    • H\u00f6here Leistung<\/strong>: Integriert Dutzende von CPUs, Hardware-Coprozessoren und Beschleunigern. Selbst mit komplexen QoS-Funktionen wie \u00dcberlastungsmanagement und Warteschlangenplanung kann er eine Weiterleitung mit Leitungsgeschwindigkeit erreichen (\"Hard Forwarding\").<\/li>\n
                    • Gr\u00f6\u00dfere Flexibilit\u00e4t<\/strong>: Programmierbare Benutzeroberfl\u00e4chen erm\u00f6glichen eine flexible Erweiterung.<\/li>\n
                    • Starke Serviceunterst\u00fctzung<\/strong>: Schnelle Unterst\u00fctzung neuer Mehrwertdienste (z. B. MPLS, QoS, Multicast).<\/li>\n
                    • Bequeme Verwaltung und Entwicklung<\/strong>: Erhebliche Verk\u00fcrzung des sekund\u00e4ren Entwicklungszyklus.<\/li>\n
                    • IPv6-Kompatibilit\u00e4t<\/strong>: Reservierte IPv6-Schnittstellen erm\u00f6glichen ein reibungsloses Software-Upgrade.<\/li>\n
                    • Hohe Verl\u00e4sslichkeit<\/strong>: Die Chips werden vor der Produktion strengen Erm\u00fcdungstests unterzogen und eignen sich daher f\u00fcr die Entwicklung von Telekommunikationsger\u00e4ten.<\/li>\n<\/ul>\n<\/div>\n
                      \n
                      \n<\/div>\n
                      \n

                      06.\u00a0Mehrstufige Vermittlungsstruktur Router<\/strong><\/h2>\n<\/div>\n
                      Eine mehrstufige Schaltstruktur besteht aus mehreren miteinander verbundenen Schalteinheiten. Jede Schalteinheit verf\u00fcgt \u00fcber einen vollst\u00e4ndigen Satz von Eingangs- und Ausgangsschnittstellen, \u00e4hnlich wie ein Standardschalter, der Eingangs- und Ausgangsverbindungen bereitstellt.<\/span><\/div>\n
                      \n
                      \n<\/div>\n
                      \n

                      07.\u00a0Cluster-Router<\/strong><\/h2>\n<\/div>\n
                      Cluster-Router bestehen aus mehreren Router-Knoten, darunter mehrere Routing-Einheiten und Vermittlungseinheiten.<\/span><\/p>\n
                        \n
                      • Die Vermittlungsstruktur fasst mehrere Vermittlungsstrukturen zusammen und bietet eine\u00a0verteilte Architektur<\/strong>\u00a0die die Anforderungen an Leistung, Skalierbarkeit und Gr\u00f6\u00dfe erf\u00fcllt.<\/li>\n
                      • Es umfasst mehrere Kontrollknoten mit Routing-Berechnungsfunktionen, die eine verteilte Implementierung von Routing- und Kontrollprotokollen erm\u00f6glichen.<\/li>\n
                      • Die Cluster-Router-Architektur gilt als die Hochleistungs-Router-Architektur der n\u00e4chsten Generation, die den Anforderungen der Internet-Entwicklung gerecht wird.<\/li>\n<\/ul>\n

                         <\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

                        01.\u00a0What Is a Router? In simple terms, a router is a device that enables network interconnection with routing and forwarding functions. Additionally, it can adapt subnet speeds, isolate subnets, and define access rules. Definition: A router is a device that enables network interconnection and operates at the\u00a0third layer of the OSI model\u2014the\u00a0network layer. It provides […]<\/p>\n","protected":false},"author":1,"featured_media":3857,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"themepark_post_bcolor":"#f5f5f5","themepark_post_width":"1022px","themepark_post_img":"","themepark_post_img_po":"left","themepark_post_img_re":false,"themepark_post_img_cover":false,"themepark_post_img_fixed":false,"themepark_post_hide_title":false,"themepark_post_main_b":"","themepark_post_main_p":100,"themepark_paddingblock":false,"footnotes":""},"categories":[16],"tags":[],"class_list":["post-3853","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"metadata":{"classic-editor-remember":["classic-editor"],"_edit_lock":["1750670703:1"],"_edit_last":["1"],"_thumbnail_id":["3857"],"themepark_seo_title":["5 Minutes to Understand How a Router Works and Its Main Components"],"themepark_seo_description":["In simple terms, a router is a device that enables network interconnection with routing and forwarding functions. 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