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 10.0.0.0/24 subnets (10.0.0.0/24 through 10.255.255.0/24) as 10.0.0.0/8.
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.
Reserved IP Addresses
Public and Private IP Addresses