![]() Without CIDR, the routing table would become quite large, as every network needs an own entry. Consider this example, where a router needs to distribute traffic for eight separate networks through the gateway 192.168.1.1: ip route 192.168.2.0/27 192.168.1.1 ![]() Simply spoken, CIDR using address aggregation can be used to address multiple networks with one single routing entry. Another problem with a classful setup is, that the bandwidth usage is quite high when routers exchange their routing information. But also the performance was compromised, since large tables need to be looked up without a more dynamic IP interval mechanism, like CIDR imposes. The memory usage of classful routing is enormous, which results in unreasonable expensive hadware. What is CIDR?ĬIDR or Classless Inter Domain Routing was developed to reduce the increasing size of routing tables of large routers, which was quite hard with classful routing. Please note: IP addresses can be cut off, if the remaining octets are just zero. 192.168.0.1: Simple Address in standard class. ![]() For additional information, see RFC 1918. The inverse mask is primarily used in Cisco access control lists (ACLs).Īddress ranges below are reserved by IANA for private intranets, and not routable to the Internet. ** Inverse mask is calculated by subtracting each subnet mask octet value from 255. ![]() Please note: Certain potions of the IPv4 address space are specifically allocated by RFCs for special uses such as loopback (RFC 1643), private networks (RFC 1918), and zeroconf (RFC 3927) usage. ![]()
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