User Guide

VLSM, CID

Supernetting and

Aggregation

14 Networking Services - IP

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3EC 36231 ABAA TCZZA Ed. 01

Next to traditional classful IP addressing, (sub)netmasking and

routing the STPro features also the following new IP standards:

 Variable Length Subnet Masking (VLSM)

VLSM refers to the fact that one network can be configured

with different contiguous masks. This offers the capability to

allocate subnetworks with variable numbers of hosts, thus

allowing a better utilization of address space.

 Classless Inter Domain Routing (CIDR)

In CIDR, an IP network is represented by a prefix, which is the

IP address of a network, followed by a slash and , lastly, an

indication of the number of leftmost contiguous bits

corresponding to the network mask to be associated with that

network address.

 Supernetting

A network is referred to as Supernet when a prefix netmask

boundary contains fewer bits than a network's natural -

classful mask.

 Route Aggregation

Route Aggregation refers to the way CIDR and its prefix

notation can be used to advertise multiple IP networks with

one aggregate Supernet route indication.

Therefor, the STPro is compliant to all relevant sections in

RFC1338, RFC1518 and RFC1519

See these RFCs for more information.