The difference between classfull routing and classless routing lies in VLSM. VLSM (Variable Length Subnet Masking) is an extended version of the standard subnet mask /8, /16, or /24. With VLSM subnet masks such as /22, /26, /27, /28 etc can be applied to the network.
Classfull routing protocol DOES NOT support VLSM. Therefore, routing using a classfull protocol can only be done with routes having standard subnet which is 255.0.0.0/8, 255.255.0.0/16, and 255.255.255.0/24. Routing protocols that use this protocol are RIPv1, IGRP.
Classless routing protocol DOES support VLSM. In this way, routing can be applied into more specific and smaller groups, and is therefore more accurate and distributes less traffic. Routing protocols that uses classless routing protocol is RIPv2, EIGRP and OSPF
-- 6 December 2010 --
Classfull routing protocol DOES NOT support VLSM. Therefore, routing using a classfull protocol can only be done with routes having standard subnet which is 255.0.0.0/8, 255.255.0.0/16, and 255.255.255.0/24. Routing protocols that use this protocol are RIPv1, IGRP.
Classless routing protocol DOES support VLSM. In this way, routing can be applied into more specific and smaller groups, and is therefore more accurate and distributes less traffic. Routing protocols that uses classless routing protocol is RIPv2, EIGRP and OSPF
-- 6 December 2010 --
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