Why is BGP called a Path Vector Protocol ?
BGP is a distance vector protocol in that each BGP node relies on downstream neighbors to pass along routes from their routing table; the node makes its route calculations based on those advertised routes and passes the results to upstream neighbors. However, other distance vector protocols quantify the distance with a single number, representing hop count. In contrast, 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.
BGP is a distance vector protocol in that each BGP node relies on downstream neighbors to pass along routes from their routing table; the node makes its route calculations based on those advertised routes and passes the results to upstream neighbors. However, other distance vector protocols quantify the distance with a single number, representing hop count. In contrast, 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.
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