How to Aggregate Routes and Advertise via BGP

Resolution

Route aggregation allows you to combine groups of routes with common addresses into a single entry in the routing table. This decreases the size of the routing table as well as the number of route advertisements sent by the routing device.
Route aggregation works when it has one or more contributing route.
A contributing route is an active route that is a more specific match for the aggregate destination.
Example: for the aggregate destination 50.20.200.0/24 , route 50.20.200.64/26 is a contributing route, while 50.20.200.208/28 ,50.20.200.224/28 are not.

Requirement

Aggregate Route : 50.20.200.0/24
Contributing route : 50.20.200.64/26
Non-Contributing route 50.20.200.208/28 ,50.20.200.224/28

Routing Table

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Step1: Configure the Redistribution Profiles with Destination as the Routes that need to be aggregated or summarized.

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Step 2: Configure the Aggregate section with the aggregated route. This route would be a summary of the Destinations configured in Redistribution Profile and advertised to the EBGP neighbor.

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Step 3: Configure the Redistribution Rule selecting the Redistribution Profile configured with Step1 and commit the changes. .

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Verification

Check the Local RIB which shows the component of the Aggregated Route present in the Routing Table.

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RIB Out shows the Aggregated Route 50.20.200.0/24 being advertised.

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