It saves memory and processing resources on routing devices.For example, instead of a router having 8 individual routes (pointing to the same next hop), it can have an aggregated route of these 8 individual routes. The main purpose of supernetting is reducing the size of the routing table on routers. Supernetting is mostly used in relation to route advertisement, but it also has other uses like when creating access control lists (ACLs), combining multiple static routes into one, and so on. While Subnetting works on one network (and splits it down), Supernetting combines multiple networks into one versus the image that seems to suggest that it works on a single network. ![]() Warning: The diagram above is just for explanation purposes, comparing subnetting and supernetting. On the other hand, for supernetting, we take bits from the Network portion to create bigger networks. For subnetting, we “borrow” bits from the Host ID to create smaller networks. Let’s consider the basic definition of an IP address (network): it consists of the network portion and the Host ID. Supernetting is about aggregating networks together to form a larger network (a super network or supernet). While there may be some minor differences technically speaking, we will keep it simple and just consider them all as the same thing. Note: There are several names for aggregating networks together including Supernetting, Route Aggregation, Summarization, and so on. We will take examples and also see a case study on how supernetting affects the routing table on routers. In this article, we will be discussing Supernetting, why it is useful, and how to perform supernetting correctly. ![]() However, there is a less familiar twin sister called Supernetting which is just the opposite – combining/aggregating networks together to form a larger network. This is because Subnetting is one of those topics that can be difficult to understand and also comes up frequently in many Networking certification exams. Most people in the networking field are familiar with Subnetting – the process of breaking down a larger network into smaller networks ( subnets).
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