All of these networks have the subnet mask of 255.255.255.0 (hence, the /24). What is network summarization (aka route aggregation)? This means we have the luxury of adding or subtracting bits from our subnet mask to allow us to either subnet our network further (by adding bits) or supernet our network (by taking bits away). Because everyone uses CIDR today, we can use variable-length subnet masks (VLSMs). This goes back to the old standard of having to have a certain subnet mask for classes of IP networks. CIDR eliminates the need for a fixed-length subnet mask (FLSM) associated with our IP networks. This is possible because of classless inter-domain routing (CIDR). Network summarization is the act of taking two or more IP networks and using a single IP network to represent them all. But what, specifically, are summarization and aggregation?įor video training on subnetting and supernetting, checkout my favorite Cisco CCNA / CCDA video training! The term “route aggregation” is just another way of saying “network summarization.” Supernetting, on the other hand, is the process of taking multiple networks and making a single larger network (very similar to summarization and aggregation). Note: this article originally appeared at Introduction to network summarization terminology In this tip, you’ll learn more about the IP addressing-related topics of network summarization, supernetting and wildcard masks.
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You must also know how to create an access list that references these multiple networks in a single summarized statement. Just the same, you need to understand how to read routes received from other providers. If you need to enter a static route to several subnetted networks, you can use network summarization to reference them all in one route.
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Much like one area code represents an aggregation of telephone numbers in an area, supernetting allows one routing table entry to represent an aggregation of networks. Supernetting was created as a way to solve the problem of routing tables growing beyond our current ability to manage the exhaustion of Class B network address space.
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