BGP

• AS Path (Autonomous System Path)
• In BGP, 
• each route consist 
• a network number
• information about a list of AS
• list of other path attributes
• BGP primary function:
• to exchange network reachability information with other BGP systems
• also list of AS paths
• This information can be used 
• to construct a graph of AS conectivety
• routing loops at as level can be pruned
• AS level policy decisions can be enforced
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