This identifies which node in the Cascade multi-switch network this circuit's traffic is destined for, the address the switch uses for internal routing and signaling of this PVC across the mesh. An admin diagnosing a circuit that fails to establish would check this against the network's node numbering plan to confirm the circuit is pointed at the correct destination switch. For example, a typo here pointing to node 21 instead of the intended node 12 would cause the PVC to try to route to the wrong switch entirely, producing a cktFailReason of noroute.