AS Pathis the fourthBGPattribute, AS Path is well known, mandatoryattribute.BGPprefer the shortest AS path to get to destination. In other wordspath with shortest AS path list is more desirable.
You can manipulate this by using AS path prepending . Manual manipulation of AS path length is called AS path prepending.The AS path should be extended with multiple copies of the AS number of the sender.
AS path prepending is used to:
Ensure proper return path selection.
. Distribution the traffic load for multi-homed customers.
Results of AS path prepending can be observed on the receiving router.