You can assign a weight to a route when more than one route exists to the same destination. A weight indicates a preference for that particular route over the other routes to that destination. The higher the assigned weight, the more preferred the route. By default, the route weight is 32768 for paths originated by the router, and 0 for other paths.
In the configuration shown in Figure 31, routers Boston and NY both learn about network 192.68.5.0/24 from AS 200. Routers Boston and NY both propagate the route to router LA. Router LA now has two routes for reaching 192.68.5.0/24 and must decide the appropriate route. If you prefer that router LA direct traffic through router Boston, you can configure router LA so that the weight of routes coming from router Boston are higher—more preferred—than the routes coming from router NY. Router LA subsequently prefers routes received from router Boston and therefore uses router Boston as the next hop to reach network 192.68.5.0/24.
Figure 31: Assigning a Weight to a Neighbor Connection
You can use any of the following three ways to set the weights in routes coming in from router Boston:
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