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BGP as a protocol presents some basic
elements of routing that are flexible enough to allow total control
from the administrator's perspective. The power of BGP lies in its
attributes and its route filtering techniques. Attributes are simply
parameters that can be modified to affect the BGP decision process.
Route filtering can be done on a prefix level or a path level. A
combination of filtering and attribute manipulation can achieve the
optimal routing behavior. Because traffic follows a road map laid out
by routing updates, modifying the routing behavior would eventually
modify the traffic trajectories.
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