Route Summarization

[The_guroo_2]

Guys i have a very basic question what is a difference between route summarization, CIDR and Super net..........are they all same if yes why with the different name

Thanks heaps

[tamassini]

Hi,

I think all these 3 terms are almost the same but can differ regarding where they are implemented.

Below quote from CCIE R&S Exam Cert guide, 4th edition, page 126

CIDR is used for aggregating routes for multiple classful network numbers into a single routing table entry.
CIDR uses both technical tools and administrative strategies to reduce the size of the Internet routing tables. Technically, CIDR uses route summarization, but with Internet scale in mind.
Because CIDR defines how to combine routes for multiple classful networks into a single route, some people think of this process as being the opposite of subnetting. As a result, many people refer to CIDR’s summarization results as supernetting.

HTH,

BR,

Aliou

[Latchum Naidu]

Hi,

What is CIDR?
CIDR is a new addressing scheme for the Internet which allows for more efficient allocation of IP addresses than the old Class A, B, and C address scheme.

Why Do We Need CIDR?
With a new network being connected to the Internet every 30 minutes the Internet was faced with two critical problems:

Running out of IP addresses
Running out of capacity in the global routing tables

Route summarization, also called route aggregation, is a method of minimizing the number of routing tables in an IP (Internet Protocol) network. It works by consolidating selected multiple routes into a single route advertisement, in contrast to flat routing in which every routing table contains a unique entry for each route.

To implement route summarization in IP Version 4 (IPv4), Classless Inter-Domain Routing (CIDR) must be used.

Please click on the correct answer on all posts if they answered your question.
Regards,
Naidu.