Patent ID: 7616574

Claim:
A method for dynamically triggering an exchange of reachability information between a target node of a remote domain along a traffic engineering (TE) label switched path (LSP) and a head-end node of the TE-LSP in a computer network, the method comprising: establishing a TE-LSP originating from the head-end node in a local domain and extending to a tail-end node in the remote domain, wherein the head-end node is an intradomain node located internal to the local domain and configured to use one or more interdomain nodes of the local domain to communicate with other domains; triggering, from the head-end node in response to establishing the TE-LSP, the target node of the remote domain to establish a border gateway protocol (BGP) session with the head-end node; transmitting reachability information of the tail-end node from the target node to the head-end node through the BGP session; calculating, at the head-end node, routes reachable from the tail-end node using the reachability information; and inserting the calculated routes into a routing table of the head-end node.