This read-only object reports the circuit ID negotiated during initialization for a point-to-point circuit, or the value this system would propose if no value has been negotiated yet, such as when the far end hasn't completed initialization or is an End System. Administrators reference this when confirming a point-to-point adjacency has properly negotiated a circuit ID during setup. For example, an engineer checks csIsisCircPtToPtCircID on a newly configured point-to-point circuit to confirm negotiation completed successfully rather than showing only the locally proposed value.