A method and apparatus for unilaterally forming a bi-directional label switched path between first and second routing devices in a network is disclosed. The method of the preferred embodiment is comprised of the steps of: sending a first LSP path message comprising a first bi-directional indicator from the first routing device to the second routing device; and automatically sending a second LSP path message from the second routing device to the first routing device in response to the first bi-directional indicator. The resulting two unidirectional label switched paths may be associated with one another at the endpoints to form a bi-directional LSP. The bi-directional indicator is preferably an RSVP protocol opaque object used in part to specify the router resources required for the return LSP, which may be different than the resource requirements of the forward LSP specified in the first LSP path message.