Avaya Configuring IP Services Uživatelský manuál Strana 321

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Configuring and Customizing BGP
303528-A Rev 00
8-53
Assigning Weight and Class Values to an AS
You can assign a weight class to any AS number and a weight value to a weight
class. Weights provide a way either to prefer or to avoid routes that pass through
certain ASs. The weights of each AS in a path are added, and the path with the
smallest total weight is the preferred path. An assigned weight can range from 1 to
15 plus an infinity value. Any path containing an AS weight of infinity is avoided.
AS weight classes allow you to assign multiple weight values to the same AS.
This feature allows you to consider an AS path differently for different networks.
For example, consider a situation in which two networks -- 192.32.1.0 and
192.32.2.0 -- are both reachable by two paths. The first path to each network
shares a common AS -- AS 5. The second path to each network also shares a
common AS -- AS 10. If you want to favor AS 5 in the path to 192.32.1.0 and AS
10 in the path to 192.32.2.0, you can assign one weight class to the AS in the path
to network 192.32.1.0 and another class to the AS in the path to 192.32.2.0.
When a BGP router receives a new route, it evaluates the route against any
existing accept policies. If after this evaluation the path still is to be used, the
router calculates the total weight of the path. Configure AS weights the same on
all BGP routers in an AS.
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