BGP Attributes - route map direction

When applying route-maps to adjust various BGP attributes on a BGP router, the route-map must be applied in an inbound or outbound direction. It is important to remember that the route-map, and its direction, acts upon BGP updates and not on user traffic. Such route maps are applied on a per BGP neighbor basis.

This means that any actions taken by the route-map will affect the destination of those BGP updates.

• When applied in an inbound direction, any BGP updates received will have attributes modified by the route-map before they are processed on the local device.
• When applied in an outbound direction, any BGP updates sent on that interface will have attributes modified by the route-map before they are sent to the BGP neighbor to be processed by the neighbor device.

Links:

https://networklessons.com/bgp/how-to-configure-bgp-weight-attribute/

https://networklessons.com/cisco/ccnp-route/introduction-to-route-maps