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Addressing Schemes B-5

Supernetting (Advanced TCP/IP)

Because Class B Internet addresses are in short supply, larger

networks are now usually granted a contiguous block of several

Class C addresses. Unfortunately, this creates very large routing

tables since multiple Class C routes have to be defined for each

network containing more than 254 nodes. Larger routing tables

mean more work for the routers and, therefore, poorer perfor-

mance.

Traditional IP - Each class C network must have

a routing table entry

Supernetting (Classless InterDomain Routing) is a technique

that allows each of these larger networks to be represented by a

single routing table entry.

To do this, supernet addressing does something very different

from traditional TCP/IP routing (which allows only one

netmask per network). In supernet routing, each supernet can

be assigned its own netmask.

Supernetting is defined in RFC 1519.

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USRobotics NETServer/16 Manual do Utilizador Página 233