Patent ID: 7804848
Filing Date: 2010-09-28
Classification: H04L

Abstract:
1. A method comprising the steps of: receiving, at a particular router, a neighbor discovery message through an interface to a border network segment between a first plurality of nodes for routing with Internet Protocol (IP) version 6 (IPv6) using a first routing protocol and a different second plurality of nodes for routing using a different second routing protocol, wherein the particular node is among the first plurality of nodes and the neighbor discovery message is received from an alien router among the second plurality of nodes, wherein the first routing protocol comprises an Enhanced Interior Gateway Router Protocol (EIGRP) configured to set a forwarding address (FA) field in advertisement messaging associated with external routes involving the particular router, and wherein the alien router and the particular router communicate level 3 summarized routing information using an External Border Gateway Protocol (EBGP); receiving, from the alien router through the interface, a border routing message that includes foreign routing data that indicates a route to a destination in the second plurality of nodes; determining whether an interface on the alien router to the border network segment has a global IP address, wherein the particular router includes a forward alien address process configured to forward an address for the alien router when the alien router does not have the global IP address; and if it is determined that the interface on the alien router does not have a global IP address, then performing the steps of: