route summerisation and route aggregation

Unanswered Question
royalblues Tue, 08/21/2007 - 03:07

Both essentially means the same.

Summarization when used in reference to routing protocols means the aggregated route is advertised instead of the individual routes


mohammedmahmoud Tue, 08/21/2007 - 03:27


Theoretically speaking some books refer to that Summarization is more oriented to summarization to the class full boundaries, while aggregation is classless summarization, but practically speaking both are used interchangeably.


Mohammed Mahmoud.

purohit_810 Tue, 08/21/2007 - 04:35

Discontiguous and Classless Routing


RIP v1 laways uses automatic Summarization.

The default nehaviour of RIP v2 is to summarize at network boundaries the same as RIP v1.

EIGRP also does automatic route summarization.

Classless Interdomain Routing (CIDR)


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

Key Idea: aggregate different network numbers in same address PREFIX (This Is IMPORTANT)

CIDR is also known as Supernetting.

Backbone routers only need to know how to reach a certain address prefix (Instead of Network Number).

Ultumately both are uses for common route purpose.


Dharmesh Purohit


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