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1 Ans Why supernetting is needed?

Asked by AL MaMun (4 Golds) Friday, 18 Dec 2020, 12:02 PM at (IT Job Preparation Data Communication and Networking)

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What is Supernetting?

Supernetting is the process of summarizing a bunch of contiguous Subnetted networks back in a single large network. Supernetting is also known as route summarization and route aggregation

Why Supernetting is done?

Supernetting is mainly done for optimizing the routing tables. A routing table is the summary of all known networks. Routers share routing tables to find the new path and locate the best path for destination. Without Supernetting, router will share all routes from routing tables as they are. With Supernetting, it will summarize them before sharing. Route summarization reduces the size of routing updates dramatically. Following figure shows an example of route summarization.

Advantage of Supernetting

Supernetting provides following advantages.

ü  It reduces the size of routing updates.

ü  It provides a better overview of network.

ü  It decreases the use of resources such as Memory and CPU.

ü  It decreases the required time in rebuilding the routing tables.

Supernetting can be done only in same address space. If address space is completely different between two or more routes, they cannot be summarized in a single route.

For example, we can’t summarize the route 192.168.1.0/25 with the route 193.168.1.128/25. A route can be summarized only in a route which is bigger than it in block size.

For example we can’t summarize a route of block size 64 in a route of block size 32 but we can summarize two routes of block size 32 in a single route of block size 64.

The easiest way of calculating the summarized route is adding the block size of all sequential routes and using the Subnetting which provides the block size that is equal to the result of addition. For example if we have two sequential routes of block size 16, we can summarize them in a single route of block size 32.

Answered by AL MaMun (4 Golds) Friday, 18 Dec 2020, 12:03 PM

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