Patent ID: 7334045

Claim:
A method of providing ranges of addresses reachable by each border router in a router set, the router set comprising a plurality of border routers, the method comprising: for each of the border routers in the router set, receiving at least one range of addresses advertised as being reachable by said border router, all of the ranges of addresses comprising a set of a plurality addresses; for each border router in the router set, assigning, responsive to at least one path identified as one that runs completely through an autonomous system that contains said border router via said border router at an ingress of said autonomous system, at least a portion of at least one of the ranges of addresses in the set of addresses to each of the border routers in the router set, each of the at least the portion comprising an assigned address range, wherein, for each of at least one of the border routers in the router set, the at least one assigned address range assigned to said border router and the at least one address range received from said border router differ from one another; and providing to a group of a plurality of routers internal to an autonomous system, for each border router in the router set: the identifier of said border router; and the at least one assigned address range assigned to said border router.