from doyle, routing tcpip vol 2...
BGP uses a list of AS numbers through which a packet must pass
to reach the destination. Because this list fully describes the path a packet
must take, BGP is called a path vector routing protocol to contrast it with traditional distance vector protocols. The list of AS numbers associated with a BGP route is called the AS_PATH and is one of several path attributes associated with each route.
so it is written...
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