The Need to Update RIP
RIP was one of the earliest and most successful of the distance-vector routing protocols. Its success was based on its ease of use and supportability in small networks. Over time, the Internet and its protocol (IP) grew and matured. With maturation came increased functionality. RIP lacked the basic mechanisms to cope with some of these increasingly important features. Perhaps its greatest limitation was its inability to recognize subnet masks.
Subnetting was not even defined when RFC 1058 was being developed. Despite this, RIP was able to apply heuristics to determine whether a subnet mask was actually a subnet route or a host route provided that those masks remained constant, of fixed-length, and were well known throughout ...
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