1. An optical network, comprising: a plurality of optical nodes; a plurality of links interconnecting the plurality of optical nodes; and wherein a first node of the plurality of optical nodes is configured to initiate a latency measurement to a second node of the plurality of optical nodes via transmitting an indicator using a signaling and routing protocol, the second node configured to receive and loop-back the indicator to the first node, and the first node configured to calculate latency to the second node based upon reception of the loop-backed indicator; and wherein the first node is configured to calculate latency by adding latencies associated with each of the plurality of links between the first node and the second node plus a predetermined latency time for each pass-through node.