IP Address Route Summary Explained with Examples

By | 9th November 2015

What is IP Address Route Summary?

IP Address route summation; which is also known as route aggregation, is the process routers use in advertising volume or set of IP addresses as a single address with shorter subnet mask (CIDR).

Route summarization allows engineers to configure a routing protocol so that it advertises one route, replacing several smaller routes. This process creates a new summary route that matches the same range of addresses as the original routes.

To put this in a real-world scenario, it’s like using one postal address number for all the staff in different departments in an organization, which of course will have to be distributed to every individual by the office administrator or whoever is concerned.

However, classful routing protocols like RIPv1 advertises route or IP addresses in summary, as update out an interface that belongs to another major network.
For example, RIPv1 will summarize subnets ( through as

The benefit of Route Summarization.

1. IP address or route summarization helps reduce the number of IP address or routing entries updates in the routers routing table.
2. It also helps reduce bandwidth consumption for routing updates which helps to enable faster routing table lookup for the best path to a remote network.


How to Calculate IP Address/ Route Summarization

How to Configure IP Summary route

Subnetting Class B Address

How to Calculate Subnets Using Binary method

Internet Protocol Version 6 (IPv6)

Reserved IP Addresses

Public and Private IP Addresses

Network Address Translation (NAT)

Dynamic Host Configuration Protocol (DHCP)

Classless InterDomain Routing (CIDR)

How to Configure Static Routes

Hot Standby Router Protocol (HSRP)

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