Patent ID: 7849215

Claim:
An edge router in a network comprising a plurality of Autonomous Systems (AS), a data session being established on a path from a source connected to the edge router of a first one of the plurality of AS, towards a destination connected from the source via a second one of the plurality of AS, the path having appropriate resources reserved in the plurality of AS, wherein a modification to the data session changes at least a portion of the path into a modified path, the edge router comprising: a Routing Engine (RE) comprising: at least one routing table; and at least one Routing Protocol module using the at least one routing table; and a Resource Management Module (RMM), that: detects the modification to the data session; creates a state for at least a portion of the modified path; creates an edge-router-refresh message comprising: an identifier of the data session; an identifier of the edge router; and an indication that the edge-router-refresh message is meant to be used by edge routers and not by stateless routers present on the modified path; and sends the edge-router-refresh message towards the destination on the modified path for triggering creation of appropriate states in the edge routers present on the modified path.