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BGP's real power is in managing IP traffic flows coming in and going out of the AS. BGP in general and Cisco IOS Software in particular offer a great deal of flexibility in manipulating BGP attributes LOCAL_PREFERENCE, MED, and so forth to control BGP best-path calculation. This best- path decision determines how traffic exits the AS. With the large size of BGP networks today, it is crucial that BGP operators understand how BGP attributes should be managed. This section discusses what problems can arise while trying to manage traffic leaving the AS. Here is the list of the most common problems encountered in managing outbound traffic flow:
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