Classful routing protocols such as RIP v1 & IGRP does not support VLSM (variable length subnet mask), the only masks that are carried in classful routing updates are the network masks 255.0.0.0 (/8), 255.255.0.0 (/16), 255.255.255.0 (/24). Classless routing protocols such as RIP v2, EIGRP & OSPF support VLSM.
we tend not to think of it this way, but the classful routing protocols RIPv1 & IGRP are actually performing summarization at Network boundaries. Two protocols we do know that also do this are the clessless routing protocols RIPv2 & EIGRP.
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