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CCNP Routing and Switching ROUTE 300-101 Official Cert Guide, Video Enhanced Edition by Kevin Wallace

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Influencing BGP Weight

ImageLesson 2: The Weight Attribute

A Cisco router can use the BGP Weight, on that single router, to influence that one router’s choice of outbound route. To do so, when a router receives a BGP Update, that router can set the Weight either selectively, per route, using a route map, or for all routes learned from a single neighbor. The router’s best-path algorithm then examines the Weight of competing routes, choosing the route with the bigger Weight.

The Cisco-proprietary Weight settings configured on a single router can influence only that one router, because the Weight cannot be communicated to other neighboring BGP routers. ...

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