Patent ID: 8644315

Claim:
A method, comprising: determining, at a device of a particular non-backbone domain in a computer network, whether each of one or more routes is reachable within the particular non-backbone domain, a route being considered reachable within the particular non-backbone domain when the route's Interior Gateway Protocol (IGP) best path passes within the particular non-backbone domain; filtering label mappings, at the device of the particular non-backbone domain, based on reachability within the particular non-backbone domain to remove label mappings associated with routes that are not reachable within the particular non-backbone domain, and maintain label mappings associated with routes that are reachable within the particular non-backbone domain, to generate a filtered set of label mappings having only those label mappings associated with the one or more routes whose IGP best path passes within the particular non-backbone domain; and advertising, by the device of the particular non-backbone domain, label mappings of the filtered set of label mappings to one or more neighboring devices, while not advertising one or more label mappings that are not of the filtered set to the one or more neighboring devices.