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2.2 | ![]() |
IP Addressing Crisis and Solutions | |
2.2.2 | ![]() |
Classless Interdomain Routing (CIDR) |
Routers use a form of IPv4 addressing
called Classless Interdomain Routing (CIDR) that ignores class.
CIDR was first introduced in 1993 by RFC 1517, 1518, 1519, and 1520, and later deployed in 1994. CIDR dramatically improves the scalability and efficiency of IPv4 by providing the following:
The following sections describe route aggregation, supernetting, and address allocation in more detail.
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