1. A method comprising: receiving at a first node in a network a first message from a second node in said network, wherein said first message is for establishing a route in said network from a source node in said network to a destination node in said network, and wherein said first message comprises (i) a route R from said source node to said second node, and (ii) the value of a load metric at one or more nodes in said route R; and inferring, after the receipt of said first message, that said second node did not receive a second message that was previously transmitted by said first node.