Importance

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Abstract

Routing information is exchanged between edge routers in different autonomous systems that independently define their routing policies. A Simple Path Vector Protocol extends the prior art Border Gateway Protocol in a manner that is guaranteed to converge by adding a new attribute to the routing messages sent by an edge router to its peers in the different systems. This attribute is a path history, which is dynamically computed at each router as the routing path to a particular destination is changed. The path history attribute is sent in a routing message by a router to its peers together with the sending router's path to that destination. By observing the dynamic path history that is computed at a router as a received routing message from a peer router that contains a history attribute is processed, a cycle can be identified in the newly computed history and associated with a policy conflict at that receiving router's associated autonomous system. A path whose history contains a cycle is automatically suppressed as a permitted path to that destination.

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First Claim