| p:abstract
| - Classless Inter-Domain Routing (CIDR, pronounced "cider") is a method of categorizing Internet Protocol addresses for the purpose of allocating IP addresses to users and for efficiently routing IP packets on the Internet. During the first decade of the modern Internet after the invention of the Domain Name System it became apparent that the devised system based on classful network design of distributing the address space and routing IP packets was not scalable . To alleviate the shortcomings, the Internet Engineering Task Force published in 1993 a new set of standards, RFC 1518 and RFC 1519, to define a new concept of allocation of IP address blocks and new methods of routing IPv4 packets.An IP address is interpreted in two parts: a network-identifying prefix followed by a host address within that network. In the prior classful network architecture IP address allocations were based on octet boundary segments of the 32-bit IP address, forcing either 8, 16, or 24-bit network prefixes. Thus, the smallest allocation and routing block contained only 256 addresses—too small for most enterprises, and the next larger block contained 65,536 addresses—too large to be used efficiently by even large organizations. This led to inefficiencies in address use as well as routing because the large number of allocated small networks with individual route announcements, being geographically dispersed with little opportunity for route aggregation, created heavy demand on routing equipment. Classless Inter-Domain Routing is based on variable-length subnet masking to allow allocation on arbitrary-length prefixes. Variable-length subnet masks are mentioned in RFC 950 . CIDR encompasses: the VLSM technique of specifying arbitrary-length prefixes. A CIDR-compliant address is written with a suffix indicating the number of bits in the prefix, such as 192. 168.0.0/16. This permits more efficient use of increasingly scarce IPv4 addresses. the aggregation of multiple contiguous prefixes into supernets, and, wherever possible in the Internet, advertising aggregates, thus reducing the number of entries in the global routing table. Aggregation hides multiple levels of subnetting from the Internet routing table, and reverses the process of "subnetting a subnet" with VLSM. the administrative process of allocating address blocks to organizations based on their actual and short-term projected need, rather than the very large or very small blocks required by classful addressing schemes. While IPv6 maintains the IPv4 CIDR convention of indicating prefix length with a suffix, the IPv4 concept of class was abandoned in IPv6. (en)
- Бесклассовая адресация (англ. Classless InterDomain Routing, англ. CIDR) — метод IP-адресации, позволяющий гибко управлять пространством IP-адресов, не используя жёсткие рамки классовой адресации. Использование этого метода позволяет экономно использовать конечный ресурс IP-адресов. Беcклассовая адресация основывается на переменной длине маски подсети, в то время, как в классовой адресации длина маски строго фиксирована 0,1, 2 или 3 установленными байтами. Вот пример записи IP-адреса с применением беcклассовой адресации: 10.1.2.33/27. В данном примере видно, что в маске подсети 27 бит слева выставлены в единицу (так называемые значащие биты. В таком случае говорят о длине маски подсети в 27 бит . Вот ещё один пример записи адреса в бесклассовой нотации: 172.16.0.1/12. Категория:Маршрутизация (ru)
- Classless Inter-Domain Routing (CIDR) introducerades i början av 1993 och är den senaste förbättringen i sättet som IP-adresser tolkas. Den ersätter den tidigare syntaxen med klassfulla adresser. Sättet ger större flexibilitet när större block av IP-adresser skall delas upp i mindre nät. Detta leder till följande fördelar:* Mer effektivt användande av den begränsade adressrymden i IPv4. Större användande av hierarkier i adresstilldelningar samt möjligheten till sammanslagning av prefix (prefix aggregation) vilket minskar belastningen på den globala internet routing tabellen. (sv)
- Classless Inter-Domain Routing (CIDR Encaminamiento Inter-Dominios sin Clases) se introdujo en 1993 y representa la última mejora en el modo como se interpretan las direcciones IP. Su introducción permitió una mayor flexibilidad al dividir rangos de direcciones IP en redes separadas. De esta manera permitió: Un uso más eficiente de las cada vez más escasas direcciones IPv4. Un mayor uso de la jerarquía de direcciones ('agregación de prefijos de red'), disminuyendo la sobrecarga de los enrutadores principales de Internet para realizar el encaminamiento. (es)
- Luokaton reititys (Classless Inter-Domain Routing, CIDR) mahdollistaa IPv4-luokkien yhdistämisen tai jakamisen pienempiin osiin (aliverkkoihin) käyttämällä muuttuvanpituista aliverkkopeitettä, joka kertoo kuinka monta bittiä IP-osoitteen alusta kuuluu sen verkko-osaan. Loput bitit yksilöivät laitteen. (fi)
- O CIDR (de Classless Inter-Domain Routing), foi introduzido em 1993, como um refinamento para a forma como o tráfego era conduzido pelas redes IP. Permitindo flexibilidade acrescida quando dividindo margens de endereços IP em redes separadas, promoveu assim um uso mais eficiente para os endereços IP cada vez mais escassos. O CIDR está definido no RFC 1519. (pt)
- Classless Inter-Domain Routing (CIDR) beschreibt ein Verfahren zur effizienteren Nutzung des bestehenden 32-Bit-IP-Adress-Raumes . Es wurde 1993 eingeführt, um die Größe von Routingtabellen zu reduzieren und um die verfügbaren Adressbereiche besser auszunutzen. Mit CIDR entfällt die feste Zuordnung einer IP-Adresse zu einer Netzklasse und die eventuelle Unterteilung in weitere Netze oder die Zusammenfassung mehrerer Netze einer Klasse. Es existiert nur noch eine Netzmaske, welche die IP-Adresse in den Netzwerk- und Hostteil aufteilt. Bei CIDR führte man als neue Notation so genannte Suffixe ein. Das Suffix gibt die Anzahl der 1-Bits in der Netzmaske an. Diese Schreibform ist viel kürzer als die Dotted decimal notation und ebenfalls eindeutig. (de)
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| rdfs:comment
| - Classless Inter-Domain Routing (CIDR, pronounced "cider") is a method of categorizing Internet Protocol addresses for the purpose of allocating IP addresses to users and for efficiently routing IP packets on the Internet. During the first decade of the modern Internet after the invention of the Domain Name System it became apparent that the devised system based on classful network design of distributing the address space and routing IP packets was not scalable . (en)
- Бесклассовая адресация (англ. Classless InterDomain Routing, англ. CIDR) — метод IP-адресации, позволяющий гибко управлять пространством IP-адресов, не используя жёсткие рамки классовой адресации. (ru)
- Classless Inter-Domain Routing (CIDR) introducerades i början av 1993 och är den senaste förbättringen i sättet som IP-adresser tolkas. Den ersätter den tidigare syntaxen med klassfulla adresser. Sättet ger större flexibilitet när större block av IP-adresser skall delas upp i mindre nät. (sv)
- Classless Inter-Domain Routing (CIDR Encaminamiento Inter-Dominios sin Clases) se introdujo en 1993 y representa la última mejora en el modo como se interpretan las direcciones IP. Su introducción permitió una mayor flexibilidad al dividir rangos de direcciones IP en redes separadas. De esta manera permitió: (es)
- Luokaton reititys (Classless Inter-Domain Routing, CIDR) mahdollistaa IPv4-luokkien yhdistämisen tai jakamisen pienempiin osiin (aliverkkoihin) käyttämällä muuttuvanpituista aliverkkopeitettä, joka kertoo kuinka monta bittiä IP-osoitteen alusta kuuluu sen verkko-osaan. Loput bitit yksilöivät laitteen. (fi)
- O CIDR (de Classless Inter-Domain Routing), foi introduzido em 1993, como um refinamento para a forma como o tráfego era conduzido pelas redes IP. (pt)
- Classless Inter-Domain Routing (CIDR) beschreibt ein Verfahren zur effizienteren Nutzung des bestehenden 32-Bit-IP-Adress-Raumes . (de)
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