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Specifying Which AS Numbers to Include in the Aggregate Route

By default, all AS numbers from all contributing paths are included in the aggregate route’s path. To include only the longest common leading sequences from the contributing AS paths, include the brief option when configuring the route. If doing this results in AS numbers being omitted from the aggregate route, the BGP ATOMIC_ATTRIBUTE path attribute is included with the aggregate route.




aggregate (defaults | route) {

brief;
}

To explicitly have all AS numbers from all contributing paths be included in the aggregate route’s path, include the full option when configuring routes. Include this option when configuring an individual route in the route portion of the aggregate statement to override a retain option specified in the defaults portion of the statement.




aggregate (defaults | route) {

full;
}

For a list of hierarchy levels at which you can include these statements, see the statement summary sections for these statements.

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