The Journey of a Network Engineer

Nov 20 2011   3:11AM GMT

How to configure Path Variables for BGP aggregation route?



Posted by: Sulaiman Syed
Tags:
Aggregation
Attribute
CCIE
Cisco
how
Path
route-map
router
to
variables

Using route aggregation (summary) is one of the important tools with BGP. it provides a strong foundation to keep the routes from flapping, or making rapid changes within the BGP backbone cloud. but what if we want to advertise the aggregation with different AS Path variables? as it is known BGP route can take many variables, from local-preference, weight, as-path, community values, etc.

For that, we have the attribute map a route-map that can be used to set any variable we want to the aggregation. here is the syntax

aggregate-address x.x.x.x x.x.x.x summary-only attribute-map ATTRIB

route-map ATTRIB
set community 200:200
set weight 200

it is very simple and effective. hope this post was informative.

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